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Hughes AK, Francis T, Rooney J, Pollock R, Witard OC. The effect of protein or amino acid provision on immobilization-induced muscle atrophy in healthy adults: A systematic review and meta-analysis. Exp Physiol 2024; 109:873-888. [PMID: 38424716 PMCID: PMC11140175 DOI: 10.1113/ep090434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 01/25/2024] [Indexed: 03/02/2024]
Abstract
Bed rest and limb immobilization are models of muscle disuse associated with skeletal muscle atrophy and reduced strength. The purpose of this systematic review was to examine the impact of protein or amino acid provision before and/or during a period of muscle disuse on muscle atrophy (primary outcome), strength and muscle protein synthesis (secondary outcomes) following a disuse period. We performed a systematic review of Embase, MEDLINE, Web of Science, PubMed and Clinical Trials in December 2022. Eligible studies were randomized controlled trials that combined a dietary protein or amino acid intervention versus control during an experimental model of disuse (bed rest or unilateral limb immobilization) in healthy individuals aged ≥18 years. Nine articles from eight independent trials were identified and rated for risk of bias by two authors. A meta-analysis of muscle mass data revealed no effect (standardized mean difference: 0.2; 95% confidence interval: -0.18 to 0.57, P = 0.31) of protein/amino acid intervention in preventing disuse-induced muscle atrophy. Although the meta-analysis was not conducted on strength or muscle protein synthesis data, there was insufficient evidence in the reviewed articles to support the use of protein/amino acid provision in mitigating the disuse-induced decline in either outcome measurement. Additional high-quality studies, including the reporting of randomization procedures and blinding procedures and the provision of statistical analysis plans, might be required to determine whether protein or amino acid provision serves as an effective strategy to attenuate muscle atrophy during periods of disuse.
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Affiliation(s)
- Alix K. Hughes
- Centre for Human and Applied Physiological SciencesKing's College LondonLondonUK
| | - Thomas Francis
- Centre for Human and Applied Physiological SciencesKing's College LondonLondonUK
| | - Jessica Rooney
- Centre for Human and Applied Physiological SciencesKing's College LondonLondonUK
| | - Ross Pollock
- Centre for Human and Applied Physiological SciencesKing's College LondonLondonUK
| | - Oliver C. Witard
- Centre for Human and Applied Physiological SciencesKing's College LondonLondonUK
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Casuso RA, Huertas JR, Aragón‐Vela J. The role of muscle disuse in muscular and cardiovascular fitness: A systematic review and meta-regression. Eur J Sport Sci 2024; 24:812-823. [PMID: 38874988 PMCID: PMC11235952 DOI: 10.1002/ejsc.12093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 01/06/2024] [Accepted: 02/12/2024] [Indexed: 06/15/2024]
Abstract
We aimed to assess the effects of muscle disuse on muscle strength (MS), muscle mass (MM) and cardiovascular fitness. Databases were scrutinized to identify human studies assessing the effects of muscle disuse on both (1) MM and (2) maximal oxygen uptake (VO2max) and/or MS. Random-effects meta-analysis and meta-regression with initial physical fitness and length of the protocol as a priori determined moderators were performed. We quantitatively analyzed 51 different studies, and the level of significance was set at p < 0.05. Data from the participants in 14 studies showed a decline in both VO2max (SMD: -0.93; 95% CI: -1.27 to -0.58) and MM (SMD: -0.34; 95% CI: -0.57 to -0.10). Data from 47 studies showed a decline in strength (-0.88; 95% CI: -1.04 to -0.73) and mass (SMD: -0.47; 95% CI: -0.58 to -0.36). MS loss was twice as high as MM loss, but differences existed between anatomical regions. Notably, meta-regression analysis revealed that initial MS was inversely associated with MS decline. VO2max and MS decline to a higher extent than MM during muscle disuse. We reported a more profound strength loss in subjects with high muscular strength. This is physiologically relevant for athletes because their required muscular strength can profoundly decline during a period of muscle disuse. It should however be noted that a period of muscle disuse can have devastating consequences in old subjects with low muscular strength.
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Affiliation(s)
- Rafael A. Casuso
- Department of Health SciencesUniversidad Loyola AndalucíaCórdobaSpain
| | - Jesús R. Huertas
- Department of PhysiologyInstitute of Nutrition and Food TechnologyUniversity of GranadaGranadaSpain
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3
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Bellanti F, Lo Buglio A, Pannone G, Pedicillo MC, De Stefano IS, Pignataro A, Capurso C, Vendemiale G. An Amino Acid Mixture to Counteract Skeletal Muscle Atrophy: Impact on Mitochondrial Bioenergetics. Int J Mol Sci 2024; 25:6056. [PMID: 38892242 PMCID: PMC11173258 DOI: 10.3390/ijms25116056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Revised: 05/22/2024] [Accepted: 05/29/2024] [Indexed: 06/21/2024] Open
Abstract
Skeletal muscle atrophy (SMA) is caused by a rise in muscle breakdown and a decline in protein synthesis, with a consequent loss of mass and function. This study characterized the effect of an amino acid mixture (AA) in models of SMA, focusing on mitochondria. C57/Bl6 mice underwent immobilization of one hindlimb (I) or cardiotoxin-induced muscle injury (C) and were compared with controls (CTRL). Mice were then administered AA in drinking water for 10 days and compared to a placebo group. With respect to CTRL, I and C reduced running time and distance, along with grip strength; however, the reduction was prevented by AA. Tibialis anterior (TA) muscles were used for histology and mitochondria isolation. I and C resulted in TA atrophy, characterized by a reduction in both wet weight and TA/body weight ratio and smaller myofibers than those of CTRL. Interestingly, these alterations were lightly observed in mice treated with AA. The mitochondrial yield from the TA of I and C mice was lower than that of CTRL but not in AA-treated mice. AA also preserved mitochondrial bioenergetics in TA muscle from I and C mice. To conclude, this study demonstrates that AA prevents loss of muscle mass and function in SMA by protecting mitochondria.
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Affiliation(s)
- Francesco Bellanti
- Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy; (F.B.); (A.L.B.); (C.C.)
| | - Aurelio Lo Buglio
- Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy; (F.B.); (A.L.B.); (C.C.)
| | - Giuseppe Pannone
- Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy; (G.P.); (M.C.P.); (I.S.D.S.); (A.P.)
| | - Maria Carmela Pedicillo
- Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy; (G.P.); (M.C.P.); (I.S.D.S.); (A.P.)
| | - Ilenia Sara De Stefano
- Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy; (G.P.); (M.C.P.); (I.S.D.S.); (A.P.)
| | - Angela Pignataro
- Department of Clinical and Experimental Medicine, University of Foggia, 71122 Foggia, Italy; (G.P.); (M.C.P.); (I.S.D.S.); (A.P.)
| | - Cristiano Capurso
- Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy; (F.B.); (A.L.B.); (C.C.)
| | - Gianluigi Vendemiale
- Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy; (F.B.); (A.L.B.); (C.C.)
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Meza-Valderrama D, Sánchez-Rodríguez D, Messaggi-Sartor M, Muñoz-Redondo E, Morgado-Pérez A, Tejero-Sánchez M, De Jaime-Gil E, Leiva-Banuelos N, Marco E. Supplementation with β-hydroxy-β-methylbutyrate after resistance training in post-acute care patients with sarcopenia: A randomized, double-blind placebo-controlled trial. Arch Gerontol Geriatr 2024; 119:105323. [PMID: 38171034 DOI: 10.1016/j.archger.2023.105323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 12/15/2023] [Accepted: 12/22/2023] [Indexed: 01/05/2024]
Abstract
OBJECTIVES This study aimed to evaluate the efficacy of adding β-hydroxy-β- methylbutyrate (HMB) supplementation to a 12-week exercise-based rehabilitation program in older adults with sarcopenia after discharge from a post-acute geriatric rehabilitation unit. STUDY DESIGN A randomized, double-blind, placebo-controlled trial with two parallel groups. The intervention group received 3 g/day of Ca-HMB and participated in a 12- week resistance training program (3 sessions/week). The control group received a placebo and followed the same training program. MAIN OUTCOME MEASURES The primary outcomes were the improvements of handgrip strength and physical performance assessed through the Short Physical Performance Battery (SPPB) and 4-meter gait speed; and handgrip strength. All variables were assessed at baseline, post-intervention, and 1-year follow-up. RESULTS After completing the 12-week exercise program, the intervention group showed significant improvements in SPPB-Balance (1.3, 95 %CI 0.3 to 2.4) and total SPPB score (2.2, 95 %CI 0.4 to 4.0). Intra-group analysis demonstrated gains in the SPPB-Chair Stand (0.7 points, 95 %CI 0.0 to 1.4) and total SPPB score (2.1 points, 95 %CI 0.3 to 3.9) in the intervention group. Improvements in handgrip strength were observed in women (3.7 kg, 95 %CI: 0.2 to 7.3) at the end of the intervention, and persisted at the 1-year follow-up. CONCLUSIONS Our findings suggest that the supplementation of 3 g/day of Ca-HMB with resistance exercise may significantly enhance muscle strength and physical performance among older women with sarcopenia after recent hospitalization. Given this study's limitations, the intervention's effectiveness cannot be drawn, and further studies are needed.
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Affiliation(s)
- Delky Meza-Valderrama
- Rehabilitation Research Group, Hospital del Mar Medical Research Institute, Dr. Aiguader 80, 08003 Barcelona, Catalonia, Spain; Physical Medicine and Rehabilitation Department, National Institute of Physical Medicine and Rehabilitation, Vía Centenario, 0819 Panamá City, Panamá; Sistema Nacional de Investigación- Secretaria Nacional de Ciencia e Investigación, Clayton Ciudad del Saber Edificio 205, 0819 Panamá City, Panamá.
| | - Dolores Sánchez-Rodríguez
- Rehabilitation Research Group, Hospital del Mar Medical Research Institute, Dr. Aiguader 80, 08003 Barcelona, Catalonia, Spain; Geriatrics Department, Brugmann University Hospital, Université Libre de Bruxelles, Place A.Van Gehuchten 4, 1020 Brussels, Belgium; WHO Collaborating Center for Public Health aspects of musculoskeletal health and ageing. Division of Public Health, Epidemiology and Health Economics, University of Liège, Pl. du Vingt Août 7, 4000, Liège, Belgium
| | - Monique Messaggi-Sartor
- Rehabilitation Research Group, Hospital del Mar Medical Research Institute, Dr. Aiguader 80, 08003 Barcelona, Catalonia, Spain; Physical Medicine and Rehabilitation Department. Hospital del Mar - Centre Esperança. Sant Josep de la Muntanya 12, 08024 Barcelona, Catalonia, Spain
| | - Elena Muñoz-Redondo
- Rehabilitation Research Group, Hospital del Mar Medical Research Institute, Dr. Aiguader 80, 08003 Barcelona, Catalonia, Spain; Physical Medicine and Rehabilitation Department. Hospital del Mar - Centre Esperança. Sant Josep de la Muntanya 12, 08024 Barcelona, Catalonia, Spain
| | - Andrea Morgado-Pérez
- Rehabilitation Research Group, Hospital del Mar Medical Research Institute, Dr. Aiguader 80, 08003 Barcelona, Catalonia, Spain; Physical Medicine and Rehabilitation Department. Hospital del Mar - Centre Esperança. Sant Josep de la Muntanya 12, 08024 Barcelona, Catalonia, Spain
| | - Marta Tejero-Sánchez
- Rehabilitation Research Group, Hospital del Mar Medical Research Institute, Dr. Aiguader 80, 08003 Barcelona, Catalonia, Spain; Physical Medicine and Rehabilitation Department. Hospital del Mar - Centre Esperança. Sant Josep de la Muntanya 12, 08024 Barcelona, Catalonia, Spain
| | - Elisabet De Jaime-Gil
- Geriatrics Department, Hospital del Mar - Centre Fòrum, Carrer de Llull 410, 08019, Barcelona, Catalonia, Spain
| | - Nuria Leiva-Banuelos
- Geriatrics Department, Hospital del Mar - Centre Fòrum, Carrer de Llull 410, 08019, Barcelona, Catalonia, Spain
| | - Ester Marco
- Rehabilitation Research Group, Hospital del Mar Medical Research Institute, Dr. Aiguader 80, 08003 Barcelona, Catalonia, Spain; Physical Medicine and Rehabilitation Department. Hospital del Mar - Centre Esperança. Sant Josep de la Muntanya 12, 08024 Barcelona, Catalonia, Spain; Faculty of Health and Life Sciences, Universitat Pompeu Fabra, Dr Aiguader Building (Mar Campus), Dr. Aiguader 80, 08003 Barcelona, Catalonia, Spain
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Alves PKN, Schauer A, Augstein A, Prieto Jarabo ME, Männel A, Barthel P, Vahle B, Moriscot AS, Linke A, Adams V. Leucine Supplementation Prevents the Development of Skeletal Muscle Dysfunction in a Rat Model of HFpEF. Cells 2024; 13:502. [PMID: 38534346 PMCID: PMC10969777 DOI: 10.3390/cells13060502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 03/07/2024] [Accepted: 03/12/2024] [Indexed: 03/28/2024] Open
Abstract
Heart failure with preserved ejection fraction (HFpEF) is associated with exercise intolerance due to alterations in the skeletal muscle (SKM). Leucine supplementation is known to alter the anabolic/catabolic balance and to improve mitochondrial function. Thus, we investigated the effect of leucine supplementation in both a primary and a secondary prevention approach on SKM function and factors modulating muscle function in an established HFpEF rat model. Female ZSF1 obese rats were randomized to an untreated, a primary prevention, and a secondary prevention group. For primary prevention, leucine supplementation was started before the onset of HFpEF (8 weeks of age) and for secondary prevention, leucine supplementation was started after the onset of HFpEF (20 weeks of age). SKM function was assessed at an age of 32 weeks, and SKM tissue was collected for the assessment of mitochondrial function and histological and molecular analyses. Leucine supplementation prevented the development of SKM dysfunction whereas it could not reverse it. In the primary prevention group, mitochondrial function improved and higher expressions of mitofilin, Mfn-2, Fis1, and miCK were evident in SKM. The expression of UCP3 was reduced whereas the mitochondrial content and markers for catabolism (MuRF1, MAFBx), muscle cross-sectional area, and SKM mass did not change. Our data show that leucine supplementation prevented the development of skeletal muscle dysfunction in a rat model of HFpEF, which may be mediated by improving mitochondrial function through modulating energy transfer.
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Affiliation(s)
- Paula Ketilly Nascimento Alves
- Heart Center Dresden, Laboratory of Molecular and Experimental Cardiology, TU Dresden, 01307 Dresden, Germany; (P.K.N.A.); (A.S.); (A.A.); (M.-E.P.J.); (A.M.); (B.V.); (A.L.)
- Department of Anatomy, Institute of Biomedical Sciences, University of Sao Paulo, São Paulo 05508000, Brazil;
| | - Antje Schauer
- Heart Center Dresden, Laboratory of Molecular and Experimental Cardiology, TU Dresden, 01307 Dresden, Germany; (P.K.N.A.); (A.S.); (A.A.); (M.-E.P.J.); (A.M.); (B.V.); (A.L.)
| | - Antje Augstein
- Heart Center Dresden, Laboratory of Molecular and Experimental Cardiology, TU Dresden, 01307 Dresden, Germany; (P.K.N.A.); (A.S.); (A.A.); (M.-E.P.J.); (A.M.); (B.V.); (A.L.)
| | - Maria-Elisa Prieto Jarabo
- Heart Center Dresden, Laboratory of Molecular and Experimental Cardiology, TU Dresden, 01307 Dresden, Germany; (P.K.N.A.); (A.S.); (A.A.); (M.-E.P.J.); (A.M.); (B.V.); (A.L.)
| | - Anita Männel
- Heart Center Dresden, Laboratory of Molecular and Experimental Cardiology, TU Dresden, 01307 Dresden, Germany; (P.K.N.A.); (A.S.); (A.A.); (M.-E.P.J.); (A.M.); (B.V.); (A.L.)
| | - Peggy Barthel
- Heart Center Dresden, Laboratory of Molecular and Experimental Cardiology, TU Dresden, 01307 Dresden, Germany; (P.K.N.A.); (A.S.); (A.A.); (M.-E.P.J.); (A.M.); (B.V.); (A.L.)
| | - Beatrice Vahle
- Heart Center Dresden, Laboratory of Molecular and Experimental Cardiology, TU Dresden, 01307 Dresden, Germany; (P.K.N.A.); (A.S.); (A.A.); (M.-E.P.J.); (A.M.); (B.V.); (A.L.)
| | - Anselmo S. Moriscot
- Department of Anatomy, Institute of Biomedical Sciences, University of Sao Paulo, São Paulo 05508000, Brazil;
| | - Axel Linke
- Heart Center Dresden, Laboratory of Molecular and Experimental Cardiology, TU Dresden, 01307 Dresden, Germany; (P.K.N.A.); (A.S.); (A.A.); (M.-E.P.J.); (A.M.); (B.V.); (A.L.)
| | - Volker Adams
- Heart Center Dresden, Laboratory of Molecular and Experimental Cardiology, TU Dresden, 01307 Dresden, Germany; (P.K.N.A.); (A.S.); (A.A.); (M.-E.P.J.); (A.M.); (B.V.); (A.L.)
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6
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Fuchs CJ, Hermans WJH, Nyakayiru J, Weijzen MEG, Smeets JSJ, Aussieker T, Senden JM, Wodzig WKHW, Snijders T, Verdijk LB, van Loon LJC. Daily blood flow restriction does not preserve muscle mass and strength during 2 weeks of bed rest. J Physiol 2024. [PMID: 38411283 DOI: 10.1113/jp286065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Accepted: 02/08/2024] [Indexed: 02/28/2024] Open
Abstract
We measured the impact of blood flow restriction on muscle protein synthesis rates, muscle mass and strength during 2 weeks of strict bed rest. Twelve healthy, male adults (age: 24 ± 3 years, body mass index: 23.7 ± 3.1 kg/m2 ) were subjected to 14 days of strict bed rest with unilateral blood flow restriction performed three times daily in three 5 min cycles (200 mmHg). Participants consumed deuterium oxide and we collected blood and saliva samples throughout 2 weeks of bed rest. Before and immediately after bed rest, lean body mass (dual-energy X-ray absorptiometry scan) and thigh muscle volume (magnetic resonance imaging scan) were assessed in both the blood flow restricted (BFR) and control (CON) leg. Muscle biopsies were collected and unilateral muscle strength (one-repetition maximum; 1RM) was assessed for both legs before and after the bed rest period. Bed rest resulted in 1.8 ± 1.0 kg lean body mass loss (P < 0.001). Thigh muscle volume declined from 7.1 ± 1.1 to 6.7 ± 1.0 L in CON and from 7.0 ± 1.1 to 6.7 ± 1.0 L in BFR (P < 0.001), with no differences between treatments (P = 0.497). In addition, 1RM leg extension strength decreased from 60.2 ± 10.6 to 54.8 ± 10.9 kg in CON and from 59.2 ± 12.1 to 52.9 ± 12.0 kg in BFR (P = 0.014), with no differences between treatments (P = 0.594). Muscle protein synthesis rates during bed rest did not differ between the BFR and CON leg (1.11 ± 0.12 vs. 1.08 ± 0.13%/day, respectively; P = 0.302). Two weeks of bed rest substantially reduces skeletal muscle mass and strength. Blood flow restriction during bed rest does not modulate daily muscle protein synthesis rates and does not preserve muscle mass or strength. KEY POINTS: Bed rest, often necessary for recovery from illness or injury, leads to the loss of muscle mass and strength. It has been postulated that blood flow restriction may attenuate the loss of muscle mass and strength during bed rest. We investigated the effect of blood flow restriction on muscle protein synthesis rates, muscle mass and strength during 2 weeks of strict bed rest. Blood flow restriction applied during bed rest does not modulate daily muscle protein synthesis rates and does not preserve muscle mass or strength. Blood flow restriction is not effective in preventing muscle atrophy during a prolonged period of bed rest.
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Affiliation(s)
- Cas J Fuchs
- Department of Human Biology, Faculty of Health, Medicine and Life Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Wesley J H Hermans
- Department of Human Biology, Faculty of Health, Medicine and Life Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Jean Nyakayiru
- Department of Human Biology, Faculty of Health, Medicine and Life Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Michelle E G Weijzen
- Department of Human Biology, Faculty of Health, Medicine and Life Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Joey S J Smeets
- Department of Human Biology, Faculty of Health, Medicine and Life Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Thorben Aussieker
- Department of Human Biology, Faculty of Health, Medicine and Life Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Joan M Senden
- Department of Human Biology, Faculty of Health, Medicine and Life Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Will K H W Wodzig
- Central Diagnostic Laboratory, Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Tim Snijders
- Department of Human Biology, Faculty of Health, Medicine and Life Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Lex B Verdijk
- Department of Human Biology, Faculty of Health, Medicine and Life Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University Medical Centre+, Maastricht, The Netherlands
| | - Luc J C van Loon
- Department of Human Biology, Faculty of Health, Medicine and Life Sciences, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University Medical Centre+, Maastricht, The Netherlands
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7
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Noone J, Damiot A, Kenny H, Chery I, Zahariev A, Normand S, Crampes F, de Glisezinski I, Rochfort KD, Laurens C, Bareille MP, Simon C, Bergouignan A, Blanc S, O'Gorman DJ. The impact of 60 days of -6° head down tilt bed rest on mitochondrial content, respiration and regulators of mitochondrial dynamics. J Physiol 2023. [PMID: 38050414 DOI: 10.1113/jp284734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Accepted: 11/01/2023] [Indexed: 12/06/2023] Open
Abstract
It is unclear how skeletal muscle metabolism and mitochondrial function adapt to long duration bed rest and whether changes can be prevented by nutritional intervention. The present study aimed (1) to assess the effect of prolonged bed rest on skeletal muscle mitochondrial function and dynamics and (2) to determine whether micronutrient supplementation would mitigate the adverse metabolic effect of bed rest. Participants were maintained in energy balance throughout 60 days of bed rest with micronutrient supplementation (INT) (body mass index: 23.747 ± 1.877 kg m-2 ; 34.80 ± 7.451 years; n = 10) or without (control) (body mass index: 24.087 ± 2.088 kg m-2 ; 33.50 ± 8.541 years; n = 10). Indirect calorimetry and dual-energy x-ray absorptiometry were used for measures of energy expenditure, exercise capacity and body composition. Mitochondrial respiration was determined by high-resolution respirometry in permeabilized muscle fibre bundles from vastus lateralis biopsies. Protein and mRNA analysis further examined the metabolic changes relating to regulators of mitochondrial dynamics induced by bed rest. INT was not sufficient in preserving whole body metabolic changes conducive of a decrease in body mass, fat-free mass and exercise capacity within both groups. Mitochondrial respiration, OPA1 and Drp1 protein expression decreased with bed rest, with an increase pDrp1s616 . This reduction in mitochondrial respiration was explained through an observed decrease in mitochondrial content (mtDNA:nDNA). Changes in regulators of mitochondrial dynamics indicate an increase in mitochondrial fission driven by a decrease in inner mitochondrial membrane fusion (OPA1) and increased pDrp1s616 . KEY POINTS: Sixty days of -6° head down tilt bed rest leads to significant changes in body composition, exercise capacity and whole-body substrate metabolism. Micronutrient supplementation throughout bed rest did not preserve whole body metabolic changes. Bed rest results in a decrease in skeletal muscle mitochondrial respiratory capacity, mainly as a result of an observed decrease in mitochondrial content. Prolonged bed rest ensues changes in key regulators of mitochondrial dynamics. OPA1 and Drp1 are significantly reduced, with an increase in pDrp1s616 following bed rest indicative of an increase in mitochondrial fission. Given the reduction in mitochondrial content following 60 days of bed rest, the maintenance of regulators of mitophagy in line with the increase in regulators of mitochondrial fission may act to maintain mitochondrial respiration to meet energy demands.
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Affiliation(s)
- John Noone
- School of Health and Human Performance, Dublin City University, Dublin, Ireland
- National Institute for Cellular and Biotechnology, Dublin City University, Dublin, Ireland
- Translational Research Institute, AdventHealth, Orlando, FL, USA
| | - Anthony Damiot
- CNRS UMR7178, Institut Pluridisciplinaire Hubert Curien, Strasbourg University, Strasbourg, France
| | - Helena Kenny
- School of Health and Human Performance, Dublin City University, Dublin, Ireland
- National Institute for Cellular and Biotechnology, Dublin City University, Dublin, Ireland
| | - Isabelle Chery
- CNRS UMR7178, Institut Pluridisciplinaire Hubert Curien, Strasbourg University, Strasbourg, France
| | - Alexandre Zahariev
- CNRS UMR7178, Institut Pluridisciplinaire Hubert Curien, Strasbourg University, Strasbourg, France
| | - Sylvie Normand
- CarMen Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, Human Nutrition Research Center Rhône-Alpes, Oullins, France
| | - François Crampes
- Departments of Clinical Biochemistry and Sports Medicine, Institut National de la Santé et de la Recherche Médicale, UMR 1048, Obesity Research Laboratory, Institute of Metabolic and Cardiovascular Diseases and University of Toulouse, Paul Sabatier University and Toulouse University Hospitals, Toulouse, France
| | - Isabelle de Glisezinski
- Departments of Clinical Biochemistry and Sports Medicine, Institut National de la Santé et de la Recherche Médicale, UMR 1048, Obesity Research Laboratory, Institute of Metabolic and Cardiovascular Diseases and University of Toulouse, Paul Sabatier University and Toulouse University Hospitals, Toulouse, France
| | - Keith D Rochfort
- National Institute for Cellular and Biotechnology, Dublin City University, Dublin, Ireland
- School of Nursing, Psychotherapy and Community Health, Dublin City University, Dublin, Ireland
| | - Claire Laurens
- Departments of Clinical Biochemistry and Sports Medicine, Institut National de la Santé et de la Recherche Médicale, UMR 1048, Obesity Research Laboratory, Institute of Metabolic and Cardiovascular Diseases and University of Toulouse, Paul Sabatier University and Toulouse University Hospitals, Toulouse, France
- Institut National de la Santé et de la Recherche Médicale, UMR 1048, Obesity Research Laboratory, Institute of Metabolic and Cardiovascular Diseases, Toulouse, France
| | | | - Chantal Simon
- CarMen Laboratory, INSERM 1060, INRA 1397, University Claude Bernard Lyon1, Human Nutrition Research Center Rhône-Alpes, Oullins, France
| | - Audrey Bergouignan
- CNRS UMR7178, Institut Pluridisciplinaire Hubert Curien, Strasbourg University, Strasbourg, France
- Anschutz Health and Wellness Center, Aurora, CO, USA
- Division of Endocrinology, Metabolism and Diabetes, University of Colorado, Aurora, CO, USA
| | - Stéphane Blanc
- CNRS UMR7178, Institut Pluridisciplinaire Hubert Curien, Strasbourg University, Strasbourg, France
| | - Donal J O'Gorman
- School of Health and Human Performance, Dublin City University, Dublin, Ireland
- National Institute for Cellular and Biotechnology, Dublin City University, Dublin, Ireland
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Reider L, Owen EC, Dreyer HC, Fitton LS, Willey MC. Loss of Muscle Mass and Strength After Hip Fracture: an Intervention Target for Nutrition Supplementation. Curr Osteoporos Rep 2023; 21:710-718. [PMID: 38019345 DOI: 10.1007/s11914-023-00836-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/03/2023] [Indexed: 11/30/2023]
Abstract
PURPOSEOF REVIEW To summarize what is known about the deleterious effect of hip fracture on muscle mass and strength as well as the scientific evidence for post-surgical nutrition supplementation to maintain muscle and improve function. RECENT FINDINGS This review provides a discussion of the relationship between muscle mass, strength, and physical function following hip fracture, briefly describes the approaches to measuring lean mass, discusses prevalence of sarcopenia and malnutrition among older men and women with hip fracture, and reviews the effects of essential amino acids on muscle. Loss of muscle mass and strength following hip fracture is substantial with consequences for recovery of functional independence. EAA-based nutrition supplementation, which directly effects muscle, has potential to improve outcomes.
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Affiliation(s)
- Lisa Reider
- Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, 624 N. Broadway Street, Room 648, Baltimore, MD, 21205, USA.
| | | | - Hans C Dreyer
- Department of Human Physiology, University of Oregon, Eugene, OR, 97403, USA
| | - Lori S Fitton
- Department of Orthopedics & Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Michael C Willey
- Department of Orthopedics & Rehabilitation, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
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9
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Spiering BA, Weakley J, Mujika I. Effects of Bed Rest on Physical Performance in Athletes: A Systematic and Narrative Review. Sports Med 2023; 53:2135-2146. [PMID: 37495758 PMCID: PMC10587175 DOI: 10.1007/s40279-023-01889-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/03/2023] [Indexed: 07/28/2023]
Abstract
BACKGROUND Athletes can face scenarios in which they are confined to bed rest (e.g., due to injury or illness). Existing research in otherwise healthy individuals indicates that those entering bed rest with the greatest physical performance level might experience the greatest performance decrements, which indirectly suggests that athletes might be more susceptible to the detrimental consequences of bed rest than general populations. Therefore, a comprehensive understanding of the effects of bed rest might help guide the medical care of athletes during and following bed rest. OBJECTIVE This systematic and narrative review aimed to (1) establish the evidence for the effects of bed rest on physical performance in athletes; (2) discuss potential countermeasures to offset these negative consequences; and (3) identify the time-course of recovery following bed rest to guide return-to-sport rehabilitation. METHODS This review was performed using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Four databases were searched (SPORTDiscus, Web of Science, Scopus, and MEDLINE/PubMed) in October of 2022, and studies were included if they were peer-reviewed investigations, written in English, and investigated the effects of horizontal bed rest on changes in physical capacities and qualities in athletes (defined as Tier 3-5 participants). The reporting quality of the research was assessed using a modified version of the Downs & Black checklist. Furthermore, findings from studies that involved participants in Tiers 1-2 were presented and synthesized using a narrative approach. RESULTS Our systematic review of the literature using a rigorous criterion of 'athletes' revealed zero scientific publications. Nevertheless, as a by-product of our search, seven studies were identified that involved apparently healthy individuals who performed specific exercise training prior to bed rest. CONCLUSIONS Based on the limited evidence from studies involving non-athletes who were otherwise healthy prior to bed rest, we generally conclude that (1) bed rest rapidly (within 3 days) decreases upright endurance exercise performance, likely due to a rapid loss in plasma volume; whereas strength is reduced within 5 days, likely due to neural factors as well as muscle atrophy; (2) fluid/salt supplementation may be an effective countermeasure to protect against decrements in endurance performance during bed rest; while a broader array of potentially effective countermeasures exists, the efficacy of these countermeasures for previously exercise-trained individuals requires further study; and (3) athletes likely require at least 2-4 weeks of progressive rehabilitation following bed rest of ≤ 28 days, although the timeline of recovery might need to be extended depending on the underlying reason for bed rest (e.g., injury or illness). Despite these general conclusions from studies involving non-athletes, our primary conclusion is that substantial effort and research is still required to quantify the effects of bed rest on physical performance, identify effective countermeasures, and provide return-to-sport timelines in bona fide athletes. TRIAL REGISTRATION NUMBER AND DATE OF REGISTRATION Registration ID: osf.io/d3aew; Date: October 24, 2022.
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Affiliation(s)
- Barry A Spiering
- Sports Research Laboratory, New Balance Athletics, Inc., Boston, MA, USA
| | - Jonathon Weakley
- School of Behavioural and Health Sciences, Australian Catholic University, McAuley at Banyo, Brisbane, QLD, Australia.
- Sports Performance, Recovery, Injury and New Technologies (SPRINT) Research Centre, Australian Catholic University, Brisbane, QLD, Australia.
- Carnegie Applied Rugby Research (CARR) Centre, Carnegie School of Sport, Leeds, UK.
| | - Iñigo Mujika
- Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country, Leioa, Basque Country, Spain
- Exercise Science Laboratory, School of Kinesiology, Faculty of Medicine, Universidad Finis Terrae, Santiago, Chile
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10
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Smeuninx B, Elhassan YS, Sapey E, Rushton AB, Morgan PT, Korzepa M, Belfield AE, Philp A, Brook MS, Gharahdaghi N, Wilkinson D, Smith K, Atherton PJ, Breen L. A single bout of prior resistance exercise attenuates muscle atrophy and declines in myofibrillar protein synthesis during bed-rest in older men. J Physiol 2023. [PMID: 37856286 DOI: 10.1113/jp285130] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Accepted: 10/05/2023] [Indexed: 10/21/2023] Open
Abstract
Impairments in myofibrillar protein synthesis (MyoPS) during bed rest accelerate skeletal muscle loss in older adults, increasing the risk of adverse secondary health outcomes. We investigated the effect of prior resistance exercise (RE) on MyoPS and muscle morphology during a disuse event in 10 healthy older men (65-80 years). Participants completed a single bout of unilateral leg RE the evening prior to 5 days of in-patient bed-rest. Quadriceps cross-sectional area (CSA) was determined prior to and following bed-rest. Serial muscle biopsies and dual stable isotope tracers were used to determine rates of integrated MyoPS (iMyoPS) over a 7 day habitual 'free-living' phase and the bed-rest phase, and rates of acute postabsorptive and postprandial MyoPS (aMyoPS) at the end of bed rest. Quadriceps CSA at 40%, 60% and 80% of muscle length significantly decreased in exercised (EX) and non-exercised control (CTL) legs with bed-rest. The decline in quadriceps CSA at 40% and 60% of muscle length was attenuated in EX compared with CTL. During bed-rest, iMyoPS rates decreased from habitual values in CTL, but not EX, and were significantly different between legs. Postprandial aMyoPS rates increased above postabsorptive values in EX only. The change in iMyoPS over bed-rest correlated with the change in quadriceps CSA in CTL, but not EX. A single bout of RE attenuated the decline in iMyoPS rates and quadriceps atrophy with 5 days of bed-rest in older men. Further work is required to understand the functional and clinical implications of prior RE in older patient populations. KEY POINTS: Age-related skeletal muscle deterioration, linked to numerous adverse health outcomes, is driven by impairments in muscle protein synthesis that are accelerated during periods of disuse. Resistance exercise can stimulate muscle protein synthesis over several days of recovery and therefore could counteract impairments in this process that occur in the early phase of disuse. In the present study, we demonstrate that the decline in myofibrillar protein synthesis and muscle atrophy over 5 days of bed-rest in older men was attenuated by a single bout of unilateral resistance exercise performed the evening prior to bed-rest. These findings suggest that concise resistance exercise intervention holds the potential to support muscle mass retention in older individuals during short-term disuse, with implications for delaying sarcopenia progression in ageing populations.
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Affiliation(s)
- Benoit Smeuninx
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
- Cellular & Molecular Metabolism Laboratory, Monash University, Melbourne, Victoria, Australia
| | - Yasir S Elhassan
- Institute of Metabolism and Systems Research, University of Birmingham, Birmingham, UK
- Centre for Endocrinology, Diabetes and Metabolism, Birmingham Health Partners, Birmingham, UK
| | - Elizabeth Sapey
- Birmingham Acute Care Research Group, Institute of Inflammation and Ageing, University of Birmingham, Birmingham, UK
| | - Alison B Rushton
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
| | - Paul T Morgan
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
| | - Marie Korzepa
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
| | - Archie E Belfield
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
| | - Andrew Philp
- Centre for Healthy Ageing, Centenary Institute, Camperdown, New South Wales, Australia
| | - Matthew S Brook
- Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Royal Derby Hospital Centre, Derby, UK
- MRC-ARUK Centre of Excellence for Musculoskeletal Ageing Research, University of Nottingham, Derby, UK
| | - Nima Gharahdaghi
- Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Royal Derby Hospital Centre, Derby, UK
- MRC-ARUK Centre of Excellence for Musculoskeletal Ageing Research, University of Nottingham, Derby, UK
| | - Daniel Wilkinson
- Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Royal Derby Hospital Centre, Derby, UK
- MRC-ARUK Centre of Excellence for Musculoskeletal Ageing Research, University of Nottingham, Derby, UK
| | - Kenneth Smith
- Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Royal Derby Hospital Centre, Derby, UK
- MRC-ARUK Centre of Excellence for Musculoskeletal Ageing Research, University of Nottingham, Derby, UK
| | - Philip J Atherton
- Centre Of Metabolism, Ageing and Physiology (COMAP), School of Medicine, University of Nottingham, Royal Derby Hospital Centre, Derby, UK
- MRC-ARUK Centre of Excellence for Musculoskeletal Ageing Research, University of Nottingham, Derby, UK
| | - Leigh Breen
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Birmingham, UK
- MRC-ARUK Centre for Musculoskeletal Ageing Research, University of Birmingham, Birmingham, UK
- NIHR Birmingham Biomedical Research Centre, University Hospitals Birmingham NHS Foundation Trust and University of Birmingham, Birmingham, UK
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11
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Ely IA, Phillips BE, Smith K, Wilkinson DJ, Piasecki M, Breen L, Larsen MS, Atherton PJ. A focus on leucine in the nutritional regulation of human skeletal muscle metabolism in ageing, exercise and unloading states. Clin Nutr 2023; 42:1849-1865. [PMID: 37625315 DOI: 10.1016/j.clnu.2023.08.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 04/23/2023] [Accepted: 08/10/2023] [Indexed: 08/27/2023]
Abstract
Muscle protein synthesis (MPS) and muscle protein breakdown (MPB) are influenced through dietary protein intake and physical (in)activity, which it follows, regulate skeletal muscle (SKM) mass across the lifespan. Following consumption of dietary protein, the bio-availability of essential amino acids (EAA), and primarily leucine (LEU), drive a transient increase in MPS with an ensuing refractory period before the next MPS stimulation is possible (due to the "muscle full" state). At the same time, MPB is periodically constrained via reflex insulin actions. Layering exercise on top of protein intake increases the sensitivity of SKM to EAA, therefore extending the muscle full set-point (∼48 h), to permit long-term remodelling (e.g., hypertrophy). In contrast, ageing and physical inactivity are associated with a premature muscle full set-point in response to dietary protein/EAA and contractile activity. Of all the EAA, LEU is the most potent stimulator of the mechanistic target of rapamycin complex 1 (mTORC1)-signalling pathway, with the phosphorylation of mTORC1 substrates increasing ∼3-fold more than with all other EAA. Furthermore, maximal MPS stimulation is also achieved following low doses of LEU-enriched protein/EAA, negating the need for larger protein doses. As a result, LEU supplementation has been of long term interest to maximise muscle anabolism and subsequent net protein accretion, especially when in tandem with resistance exercise. This review highlights current knowledge vis-à-vis the anabolic effects of LEU supplementation in isolation, and in enriched protein/EAA sources (i.e., EAA and/or protein sources with added LEU), in the context of ageing, exercise and unloading states.
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Affiliation(s)
- Isabel A Ely
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and Nottingham NIHR Biomedical Research Centre, Derby, DE22 3DT, UK
| | - Bethan E Phillips
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and Nottingham NIHR Biomedical Research Centre, Derby, DE22 3DT, UK
| | - Kenneth Smith
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and Nottingham NIHR Biomedical Research Centre, Derby, DE22 3DT, UK
| | - Daniel J Wilkinson
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and Nottingham NIHR Biomedical Research Centre, Derby, DE22 3DT, UK
| | - Mathew Piasecki
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and Nottingham NIHR Biomedical Research Centre, Derby, DE22 3DT, UK
| | - Leigh Breen
- School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | | | - Philip J Atherton
- Centre of Metabolism, Ageing & Physiology (COMAP), MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and Nottingham NIHR Biomedical Research Centre, Derby, DE22 3DT, UK.
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12
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Ye H, Yang JM, Luo Y, Long Y, Zhang JH, Zhong YB, Gao F, Wang MY. Do dietary supplements prevent loss of muscle mass and strength during muscle disuse? A systematic review and meta-analysis of randomized controlled trials. Front Nutr 2023; 10:1093988. [PMID: 37252241 PMCID: PMC10210142 DOI: 10.3389/fnut.2023.1093988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Accepted: 04/21/2023] [Indexed: 05/31/2023] Open
Abstract
Objective We performed a systematic review and meta-analysis of existing randomized controlled trials (RCTs) to assess whether dietary supplements can prevent loss of muscle mass and strength during muscle disuse. Methods We searched the following databases: PubMed, Embase, Cochrane, Scopus, Web of Science, and CINAHL for RCTs assessing the effect of dietary supplements on disuse muscular atrophy without language and time restrictions. Muscle strength and leg lean mass were used as the primary outcome indicators. Muscle cross-sectional area (CSA), muscle fiber type distribution, peak aerobic capacity and muscle volume were used as secondary outcome indicators. The risk of bias was assessed using the Cochrane Collaboration's Risk of Bias tool. Heterogeneity was tested using the I2 statistic index. Mean and standard deviation of outcome indicators were extracted from the intervention and control groups to calculate effect sizes and 95% confidence intervals, with the significance level set at P < 0.05. Results Twenty RCTs were included with a total of 339 subjects. The results showed that dietary supplements had no effect on muscle strength, CSA, muscle fiber type distribution, peak aerobic capacity or muscle volume. But dietary supplements have a protective effect on the lean mass of the legs. Conclusion Dietary supplements can improve lean leg mass, but did not show a tendency to have an effect on muscle strength, CSA, muscle fiber type distribution, peak aerobic capacity or muscle volume during muscle disuse. Systematic review registration https://www.crd.york.ac.uk/PROSPERO/#recordDetails, identifier: CRD42022370230.
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Affiliation(s)
- Hua Ye
- Gannan Medical University, Ganzhou City, Jiangxi, China
| | - Jia-Ming Yang
- Department of Rehabilitation Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou City, Jiangxi, China
| | - Yun Luo
- Department of Rehabilitation Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou City, Jiangxi, China
| | - Yi Long
- Gannan Medical University, Ganzhou City, Jiangxi, China
| | - Jia-Hong Zhang
- Department of Rehabilitation Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou City, Jiangxi, China
| | - Yan-Biao Zhong
- Department of Rehabilitation Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou City, Jiangxi, China
- Ganzhou Intelligent Rehabilitation Technology Innovation Center, Ganzhou, Jiangxi, China
| | - Feng Gao
- School of Rehabilitation, Capital Medical University, Beijing, China
- Beijing Bo'ai Hospital, China Rehabilitation Research Center, Beijing, China
| | - Mao-Yuan Wang
- Department of Rehabilitation Medicine, First Affiliated Hospital of Gannan Medical University, Ganzhou City, Jiangxi, China
- Ganzhou Key Laboratory of Rehabilitation Medicine, Ganzhou City, Jiangxi, China
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13
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Fuchs CJ, Kuipers R, Rombouts JA, Brouwers K, Schrauwen-Hinderling VB, Wildberger JE, Verdijk LB, van Loon LJ. Thigh muscles are more susceptible to age-related muscle loss when compared to lower leg and pelvic muscles. Exp Gerontol 2023; 175:112159. [PMID: 36967049 DOI: 10.1016/j.exger.2023.112159] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 03/19/2023] [Accepted: 03/22/2023] [Indexed: 04/03/2023]
Abstract
BACKGROUND A key hallmark of aging is the progressive loss of skeletal muscle mass. Due to limitations of the various methods typically applied to assess muscle mass, only limited information is available on age-related differences between various muscle groups. This study assessed differences in individual lower body muscle group volumes between healthy young and older males. METHODS Lower body muscle mass assessments were performed in 10 young (age: 27 ± 4 y) and 10 older (age: 71 ± 6 y) healthy, male adults using Dual-energy X-ray Absorptiometry (DXA), single slice (thigh) Computed Tomography (CT), as well as Magnetic Resonance Imaging (MRI). Muscle volumes of all individual muscle groups in the lower body were assessed by MRI. RESULTS Leg lean mass, as assessed with DXA, was not significantly different between older (9.2 ± 1.0 kg) and young (10.5 ± 2.0 kg) men (P = 0.075). Thigh muscle cross-sectional area, as assessed with CT, was significantly lower (by 13 %) in the older (137 ± 17 cm2) compared to young (157 ± 24 cm2) participants (P = 0.044). MRI-derived lower body muscle volume was also significantly lower (by 20 %) in older (6.7 ± 0.9 L) compared to young (8.3 ± 1.3 L) men (P = 0.005). This was primarily attributed to substantial differences in thigh (24 %), rather than lower leg (12 %) and pelvis (15 %) muscle volume in the older vs the young. Thigh muscle volume averaged 3.4 ± 0.5 L in older and 4.5 ± 0.7 L in young men (P = 0.001). Of all thigh muscle groups, the quadriceps femoris showed the most profound difference (30 %) between young (2.3 ± 0.4 L) and older (1.6 ± 0.2 L) men (P < 0.001). CONCLUSIONS The most profound differences in lower body muscle volume between young and older men are observed in the thigh. Within the thigh muscle groups, the quadriceps femoris shows the largest difference in muscle volume between young and older men. Finally, DXA appears less sensitive when compared to CT and MRI to assess age-related differences in muscle mass.
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14
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Zhu X, Wang J, Lu Y, Zhao Y, Zhang N, Wu W, Zhang Y, Fu Y. Potential of Food Protein-Derived Bioactive Peptides against Sarcopenia: A Comprehensive Review. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:5419-5437. [PMID: 36988097 DOI: 10.1021/acs.jafc.2c09094] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Sarcopenia is an age-related progressive muscle disorder characterized by accelerated loss of muscle mass, strength, and function, which are important causes of physiological dysfunctions in the elderly. At present, the main alleviating method includes protein supplements to stimulate synthesis of muscle proteins. Food protein-derived peptides containing abundant branched-chain amino acids have a remarkable effect on the improvement of sarcopenia. Understanding the underlying molecular mechanism and clarifying the structure-activity relationship is essential for the mitigation of sarcopenia. This present review recaps the epidemiology, pathogenesis, diagnosis, and treatment of sarcopenia, which facilitates a comprehensive understanding of sarcopenia. Moreover, the latest research progress on food-derived antisarcopenic peptides is reviewed, including their antisarcopenic activity, molecular mechanism as well as structural characteristics. Food-derived bioactive peptides can indeed alleviate/mitigate sarcopenia. These antisarcopenic peptides play a pivotal role mainly by activating the PI3K/Akt/mTOR and MAPK pathways and inhibiting the ubiquitin-proteasome system and AMPK pathway, thus promoting the synthesis of muscle proteins and inhibiting their degradation. Antisarcopenic peptides alleviate sarcopenia via specific peptides, which may be absorbed into the circulation and exhibit their bioactivity in intact forms. The present review provides a theoretical reference for mitigation and prevention of sarcopenia by food protein-derived bioactive peptides.
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Affiliation(s)
- Xiaoxue Zhu
- College of Food Science, Southwest University, Chongqing 400715, China
| | - Jing Wang
- China-Canada Joint Lab of Food Nutrition and Health (Beijing), Beijing Technology & Business University (BTBU), Beijing 100048, China
| | - Yujia Lu
- Department of Epidemiology, Harvard University T.H. Chan School of Public Health, 677 Huntington Avenue, Boston, Massachusetts 02115, United States
| | - Yuchen Zhao
- Department of Epidemiology, Harvard University T.H. Chan School of Public Health, 677 Huntington Avenue, Boston, Massachusetts 02115, United States
| | - Na Zhang
- Key Laboratory of Food Science and Engineering of Heilongjiang Province, College of Food Engineering, Harbin University of Commerce, Harbin 150076, China
| | - Wei Wu
- College of Animal Science and Technology, Southwest University, Chongqing 400715, China
| | - Yuhao Zhang
- College of Food Science, Southwest University, Chongqing 400715, China
| | - Yu Fu
- College of Food Science, Southwest University, Chongqing 400715, China
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15
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Arentson-Lantz EJ, Layman DK, Leidy HJ, Campbell WW, Phillips SM. Important Concepts in Protein Nutrition, Aging, and Skeletal Muscle: Honoring Dr Douglas Paddon-Jones (1969-2021) by Highlighting His Research Contributions. J Nutr 2023; 153:615-621. [PMID: 36931744 PMCID: PMC10196581 DOI: 10.1016/j.tjnut.2023.01.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 01/04/2023] [Accepted: 01/09/2023] [Indexed: 01/13/2023] Open
Abstract
This review is a tribute to honor Dr Douglas Paddon-Jones by highlighting his career research contributions. Dr Paddon-Jones was a leader in recognizing the importance of muscle health and the interactions of physical activity and dietary protein for optimizing the health span. Aging is characterized by loss of muscle mass and strength associated with reduced rates of muscle protein synthesis (MPS) and the ability to repair and replace muscle proteins. Research from the team at the University of Texas Medical Branch in Galveston discovered that the age-related decline in MPS could be overcome by increasing the quantity or quality of dietary protein at each meal. Dr Paddon-Jones was instrumental in proposing and testing a "protein threshold" of ∼30 g protein/meal to optimize MPS in older adults. Dr Paddon-Jones demonstrated that physical inactivity greatly accelerates the loss of muscle mass and function in older adults. His work in physical activity led him to propose the "Catabolic Crisis Model" of muscle size and function losses, suggesting that age-related muscle loss is not a linear process, but the result of acute periods of disuse associated with injuries, illnesses, and bed rest. This model creates the opportunity to provide targeted interventions via protein supplementation and/or increased dietary protein through consuming high-quality animal-source foods. He illustrated that nutritional support, particularly enhanced protein quantity, quality, and meal distribution, can help preserve muscle health during periods of inactivity and promote health across the life course.
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Affiliation(s)
- Emily J Arentson-Lantz
- Department of Nutrition, Metabolism and Rehabilitation Science, University of Texas Medical Branch, Galveston, TX, USA.
| | - Donald K Layman
- Department of Food Science and Human Nutrition, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Heather J Leidy
- Department of Nutritional Sciences, Department of Pediatrics-Dell Medical, University of Texas at Austin, Austin, TX, USA
| | - Wayne W Campbell
- Department of Nutrition Science, Purdue University, West Lafayette, IN, USA
| | - Stuart M Phillips
- Department of Kinesiology, McMaster University, Hamilton, ON, Canada
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16
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Mechanotransduction for Muscle Protein Synthesis via Mechanically Activated Ion Channels. Life (Basel) 2023; 13:life13020341. [PMID: 36836698 PMCID: PMC9962945 DOI: 10.3390/life13020341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 01/24/2023] [Accepted: 01/26/2023] [Indexed: 02/03/2023] Open
Abstract
Cell mechanotransduction, the ability to detect physical forces and convert them into a series of biochemical events, is important for a wide range of physiological processes. Cells express an array of mechanosensors transducing physical forces into intracellular signaling cascades, including ion channels. Ion channels that can be directly activated by mechanical cues are known as mechanically activated (MA), or stretch-activated (SA), channels. In response to repeated exposures to mechanical stimulation in the form of resistance training, enhanced protein synthesis and fiber hypertrophy are elicited in skeletal muscle, whereas a lack of mechanical stimuli due to inactivity/mechanical unloading leads to reduced muscle protein synthesis and fiber atrophy. To date, the role of MA channels in the transduction of mechanical load to intracellular signaling pathways regulating muscle protein synthesis is poorly described. This review article will discuss MA channels in striated muscle, their regulation, and putative roles in the anabolic processes in muscle cells/fibers in response to mechanical stimuli.
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17
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Gil S, de Oliveira Júnior GN, Sarti FM, Filho WJ, Longobardi I, Turri JAO, Shinjo SK, Ferriolli E, Avelino-Silva TJ, Busse AL, Gualano B, Roschel H. Acute Muscle Mass Loss Predicts Long-Term Fatigue, Myalgia, and Health Care Costs in COVID-19 Survivors. J Am Med Dir Assoc 2023; 24:10-16. [PMID: 36493804 PMCID: PMC9682050 DOI: 10.1016/j.jamda.2022.11.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 11/07/2022] [Accepted: 11/17/2022] [Indexed: 11/24/2022]
Abstract
OBJECTIVE We examined the impact of loss of skeletal muscle mass in post-acute sequelae of SARS-CoV-2 infection, hospital readmission rate, self-perception of health, and health care costs in a cohort of COVID-19 survivors. DESIGN Prospective observational study. SETTING AND PARTICIPANTS Tertiary Clinical Hospital. Eighty COVID-19 survivors age 59 ± 14 years were prospectively assessed. METHODS Handgrip strength and vastus lateralis muscle cross-sectional area were evaluated at hospital admission, discharge, and 6 months after discharge. Post-acute sequelae of SARS-CoV-2 were evaluated 6 months after discharge (main outcome). Also, health care costs, hospital readmission rate, and self-perception of health were evaluated 2 and 6 months after hospital discharge. To examine whether the magnitude of muscle mass loss impacts the outcomes, we ranked patients according to relative vastus lateralis muscle cross-sectional area reduction during hospital stay into either "high muscle loss" (-18 ± 11%) or "low muscle loss" (-4 ± 2%) group, based on median values. RESULTS High muscle loss group showed greater prevalence of fatigue (76% vs 46%, P = .0337) and myalgia (66% vs 36%, P = .0388), and lower muscle mass (-8% vs 3%, P < .0001) than low muscle loss group 6 months after discharge. No between-group difference was observed for hospital readmission and self-perceived health (P > .05). High muscle loss group demonstrated greater total COVID-19-related health care costs 2 ($77,283.87 vs. $3057.14, P = .0223, respectively) and 6 months ($90,001.35 vs $12, 913.27, P = .0210, respectively) after discharge vs low muscle loss group. Muscle mass loss was shown to be a predictor of total COVID-19-related health care costs at 2 (adjusted β = $10, 070.81, P < .0001) and 6 months after discharge (adjusted β = $9885.63, P < .0001). CONCLUSIONS AND IMPLICATIONS COVID-19 survivors experiencing high muscle mass loss during hospital stay fail to fully recover muscle health. In addition, greater muscle loss was associated with a higher frequency of post-acute sequelae of SARS-CoV-2 and greater total COVID-19-related health care costs 2 and 6 months after discharge. Altogether, these data suggest that the loss of muscle mass resulting from COVID-19 hospitalization may incur in an economical burden to health care systems.
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Affiliation(s)
- Saulo Gil
- Applied Physiology and Nutrition Research Group, School of Physical Education and Sport, Rheumatology Division, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil; Rheumatology Division, Hospital das Clinicas HCFMUSP, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, SP, BR
| | - Gersiel Nascimento de Oliveira Júnior
- Applied Physiology and Nutrition Research Group, School of Physical Education and Sport, Rheumatology Division, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | - Flavia Mori Sarti
- School of Arts, Sciences and Humanities, University of São Paulo (USP), São Paulo, Brazil, SP, BR
| | - Wilson Jacob Filho
- Laboratorio de Investigacao Medica em Envelhecimento (LIM-66), Servico de Geriatria, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, BR
| | - Igor Longobardi
- Applied Physiology and Nutrition Research Group, School of Physical Education and Sport, Rheumatology Division, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil
| | | | - Samuel Katsuyuki Shinjo
- Rheumatology Division, Hospital das Clinicas HCFMUSP, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, SP, BR
| | - Eduardo Ferriolli
- Division of Internal and Geriatric Medicine, Department of Internal Medicine - Ribeirão Preto Medical School, Universidade de Sao Paulo, Ribeirao Preto, SP, BR
| | - Thiago Junqueira Avelino-Silva
- Laboratorio de Investigacao Medica em Envelhecimento (LIM-66), Servico de Geriatria, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, BR
| | - Alexandre Leopold Busse
- Laboratorio de Investigacao Medica em Envelhecimento (LIM-66), Servico de Geriatria, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, SP, BR
| | - Bruno Gualano
- Applied Physiology and Nutrition Research Group, School of Physical Education and Sport, Rheumatology Division, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil; Rheumatology Division, Hospital das Clinicas HCFMUSP, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, SP, BR
| | - Hamilton Roschel
- Applied Physiology and Nutrition Research Group, School of Physical Education and Sport, Rheumatology Division, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, São Paulo, SP, Brazil; Rheumatology Division, Hospital das Clinicas HCFMUSP, Faculdade de Medicina FMUSP, Universidade de Sao Paulo, Sao Paulo, SP, BR.
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18
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Vinci P, Di Girolamo FG, Mangogna A, Mearelli F, Nunnari A, Fiotti N, Giordano M, Bareille MP, Biolo G. Early lean mass sparing effect of high-protein diet with excess leucine during long-term bed rest in women. Front Nutr 2022; 9:976818. [PMID: 36505255 PMCID: PMC9729546 DOI: 10.3389/fnut.2022.976818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 11/09/2022] [Indexed: 11/25/2022] Open
Abstract
Muscle inactivity leads to muscle atrophy. Leucine is known to inhibit protein degradation and to promote protein synthesis in skeletal muscle. We tested the ability of a high-protein diet enriched with branched-chain amino acids (BCAAs) to prevent muscle atrophy during long-term bed rest (BR). We determined body composition (using dual energy x-ray absorptiometry) at baseline and every 2-weeks during 60 days of BR in 16 healthy young women. Nitrogen (N) balance was assessed daily as the difference between N intake and N urinary excretion. The subjects were randomized into two groups: one received a conventional diet (1.1 ± 0.03 g protein/kg, 4.9 ± 0.3 g leucine per day) and the other a high protein, BCAA-enriched regimen (1.6 ± 0.03 g protein-amino acid/kg, 11.4 ± 0.6 g leucine per day). There were significant BR and BR × diet interaction effects on changes in lean body mass (LBM) and N balance throughout the experimental period (repeated measures ANCOVA). During the first 15 days of BR, lean mass decreased by 4.1 ± 0.9 and 2.4 ± 2.1% (p < 0.05) in the conventional and high protein-BCAA diet groups, respectively, while at the end of the 60-day BR, LBM decreased similarly in the two groups by 7.4 ± 0.7 and 6.8 ± 2.4%. During the first 15 days of BR, mean N balance was 2.5 times greater (p < 0.05) in subjects on the high protein-BCAA diet than in those on the conventional diet, while we did not find significant differences during the following time intervals. In conclusion, during 60 days of BR in females, a high protein-BCAA diet was associated with an early protein-LBM sparing effect, which ceased in the medium and long term.
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Affiliation(s)
- Pierandrea Vinci
- Department of Medical Surgical and Health Sciences, Medical Clinic, Cattinara Hospital, University of Trieste, Trieste, Italy
| | - Filippo Giorgio Di Girolamo
- Department of Medical Surgical and Health Sciences, Medical Clinic, Cattinara Hospital, University of Trieste, Trieste, Italy,Hospital Pharmacy, Cattinara Hospital, Azienda Sanitaria Universitaria Giuliano Isontina, Trieste, Italy
| | - Alessandro Mangogna
- Institute for Maternal and Child Health, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) Burlo Garofolo, Trieste, Italy
| | - Filippo Mearelli
- Department of Medical Surgical and Health Sciences, Medical Clinic, Cattinara Hospital, University of Trieste, Trieste, Italy
| | - Alessio Nunnari
- Department of Medical Surgical and Health Sciences, Medical Clinic, Cattinara Hospital, University of Trieste, Trieste, Italy
| | - Nicola Fiotti
- Department of Medical Surgical and Health Sciences, Medical Clinic, Cattinara Hospital, University of Trieste, Trieste, Italy
| | - Mauro Giordano
- Department of Advanced Medical and Surgical Sciences, University of Campania L. Vanvitelli, Naples, Italy
| | | | - Gianni Biolo
- Department of Medical Surgical and Health Sciences, Medical Clinic, Cattinara Hospital, University of Trieste, Trieste, Italy,*Correspondence: Gianni Biolo,
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19
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Wang L, Wu T, Zhang Y, Yang K, He Y, Deng K, Liang C, Gu Y. Comparative studies on the nutritional and physicochemical properties of yoghurts from cows’, goats’, and camels’ milk powder. Int Dairy J 2022. [DOI: 10.1016/j.idairyj.2022.105542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Arentson-Lantz EJ, Deer RR, Kokonda M, Wen CL, Pecha TA, Carreon SA, Ngyen TM, Volpi E, Nowakowski S. Improvements in sleep quality and fatigue are associated with improvements in functional recovery following hospitalization in older adults. FRONTIERS IN SLEEP 2022; 1:1011930. [PMID: 37251511 PMCID: PMC10217784 DOI: 10.3389/frsle.2022.1011930] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Study objectives Poor sleep quality, a frequent problem in older adults, has been shown to be associated with reduced physical function and wellbeing. However, little is known about the relationship between sleep quality and the recovery of physical function following hospitalization. Thus, we conducted this study to examine the association between sleep quality and functional recovery after an acute hospitalization in community dwelling older adults. Methods Older adult patients (N = 23, mean age = 74 ± 9 years) were recruited during an acute hospitalization (average length of stay 3.9 days) with a cardiovascular (56%), pulmonary (22%), or metabolic (13%) admission diagnosis. Objective physical function was measured using the Short Physical Performance Battery (SPPB) and self-reported function was assessed with Katz Index of Independence in Activities of Daily Living (ADL) and Lawton Instrumental Activities of Daily Living Scale (IADL). Sleep quality was measured using Pittsburgh Sleep Quality Index (PSQI) global score and Iowa Fatigue Score (IFS). Testing was performed prior to discharge (baseline) and 4-weeks post-discharge (follow-up). Results Regression models showed PSQI Subjective Sleep Quality change scores from baseline to 4-week follow-up predicted a change in ADL (β = -0.22); PSQI Use of Sleep Medications change scores predicted a change in SPPB Total (β = 1.62) and SPPB Chair Stand (β = 0.63); IFS change scores predicted SPPB Total (β = -0.16) and SPPB Chair Stand performance (β = -0.07) change scores. Conclusions For older adults, changes in sleep medication use, daytime dysfunction, and fatigue were associated with improvements in functional recovery (including physical performance and independence) from acute hospitalization to 4-week follow-up. These results suggest that interventions focused on improving sleep quality, daytime consequences, and fatigue might help enhance physical functioning following hospitalization. Clinical trial registration ClinicalTrials.gov, identifier: NCT02203656.
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Affiliation(s)
- Emily J. Arentson-Lantz
- Department of Nutrition, Metabolism, and Rehabilitation Sciences, University of Texas Medical Branch, Galveston, TX, United States
| | - Rachel R. Deer
- Department of Nutrition, Metabolism, and Rehabilitation Sciences, University of Texas Medical Branch, Galveston, TX, United States
- Sealy Center on Aging, University of Texas Medical Branch, Galveston, TX, United States
| | - Manasa Kokonda
- Center for Innovation in Quality, Effectiveness, and Safety, Michael DeBakey VA Medical Center, Houston, TX, United States
- Department of Medicine, Baylor College of Medicine, Houston, TX, United States
| | - Chelsey L. Wen
- School of Public Health, University of Texas Health Science Center, Houston, TX, United States
| | - Thomas A. Pecha
- School of Medicine, Baylor College of Medicine, Houston, TX, United States
| | - Samantha A. Carreon
- Department of Pediatrics, Baylor College of Medicine, Houston, TX, United States
| | - Trung M. Ngyen
- School of Medicine, Baylor College of Medicine, Houston, TX, United States
| | - Elena Volpi
- Sealy Center on Aging, University of Texas Medical Branch, Galveston, TX, United States
- Department of Internal Medicine, University of Texas Medical Branch, Galveston, TX, United States
| | - Sara Nowakowski
- Department of Nutrition, Metabolism, and Rehabilitation Sciences, University of Texas Medical Branch, Galveston, TX, United States
- Center for Innovation in Quality, Effectiveness, and Safety, Michael DeBakey VA Medical Center, Houston, TX, United States
- Department of Medicine, Baylor College of Medicine, Houston, TX, United States
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21
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Ling CJ, Chen XF, Xu JY, Wang GP, Wang Y, Sun Y, Li YL, Wan ZX, Tong X, Hidayat K, Zhu WZ, Qin LQ, Yang J. Whey protein hydrolysates alleviated weight gain and improved muscle in middle-aged obese mice induced by a high-fat diet. J Funct Foods 2022. [DOI: 10.1016/j.jff.2022.105241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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22
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Nunes EA, Stokes T, McKendry J, Currier BS, Phillips SM. Disuse-induced skeletal muscle atrophy in disease and non-disease states in humans: mechanisms, prevention, and recovery strategies. Am J Physiol Cell Physiol 2022; 322:C1068-C1084. [PMID: 35476500 DOI: 10.1152/ajpcell.00425.2021] [Citation(s) in RCA: 41] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Decreased skeletal muscle contractile activity (disuse) or unloading leads to muscle mass loss, also known as muscle atrophy. The balance between muscle protein synthesis (MPS) and muscle protein breakdown (MPB) is the primary determinant of skeletal muscle mass. A reduced mechanical load on skeletal muscle is one of the main external factors leading to muscle atrophy. However, endocrine and inflammatory factors can act synergistically in catabolic states, amplifying the atrophy process and accelerating its progression. Additionally, older individuals display aging-induced anabolic resistance, which can predispose this population to more pronounced effects when exposed to periods of reduced physical activity or mechanical unloading. Different cellular mechanisms contribute to the regulation of muscle protein balance during skeletal muscle atrophy. This review summarizes the effects of muscle disuse on muscle protein balance and the molecular mechanisms involved in muscle atrophy in the absence or presence of disease. Finally, a discussion of the current literature describing efficient strategies to prevent or improve the recovery from muscle atrophy is also presented.
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Affiliation(s)
- Everson A Nunes
- Exercise Metabolism Research Group, Department of Kinesiology, McMaster University, Hamilton, ON, Canada.,Laboratory of Investigation of Chronic Diseases, Department of Physiological Sciences, Federal University of Santa Catarina, Florianópolis, SC, Brazil
| | - Tanner Stokes
- Exercise Metabolism Research Group, Department of Kinesiology, McMaster University, Hamilton, ON, Canada
| | - James McKendry
- Exercise Metabolism Research Group, Department of Kinesiology, McMaster University, Hamilton, ON, Canada
| | - Brad S Currier
- Exercise Metabolism Research Group, Department of Kinesiology, McMaster University, Hamilton, ON, Canada
| | - Stuart M Phillips
- Exercise Metabolism Research Group, Department of Kinesiology, McMaster University, Hamilton, ON, Canada
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23
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Fry JL, Munson BD, Thompson KL, Fry CS, Paddon-Jones D, Arentson-Lantz EJ. The T allele of TCF7L2 rs7903146 is associated with decreased glucose tolerance after bed rest in healthy older adults. Sci Rep 2022; 12:6897. [PMID: 35477971 PMCID: PMC9046412 DOI: 10.1038/s41598-022-10683-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Accepted: 04/11/2022] [Indexed: 12/19/2022] Open
Abstract
Inpatient populations are at increased risk of hyperglycemia due to factors such as medications, physical inactivity and underlying illness, which increases morbidity and mortality. Unfortunately, clinicians have limited tools available to prospectively identify those at greatest risk. We evaluated the ability of 10 common genetic variants associated with development of type 2 diabetes to predict impaired glucose metabolism. Our research model was a simulated inpatient hospital stay (7 day bed rest protocol, standardized diet, and physical inactivity) in a cohort of healthy older adults (n = 31, 65 ± 8 years) with baseline fasting blood glucose < 100 mg/dL. Participants completed a standard 75 g oral glucose tolerance test (OGTT) at baseline and post-bed rest. Bed rest increased 2-h OGTT blood glucose and insulin independent of genetic variant. In multiple regression modeling, the transcription factor 7-like 2 (TCF7L2) rs7903146 T allele predicted increases in 2-h OGTT blood glucose (p = 0.039). We showed that the TCF7L2 rs7903146 T allele confers risk for loss of glucose tolerance in nondiabetic older adults following 7 days of bed rest.
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Affiliation(s)
- Jean L Fry
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington, KY, 40536-0200, USA.
| | - Brooke D Munson
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington, KY, 40536-0200, USA
| | - Katherine L Thompson
- Dr. Bing Zhang Department of Statistics, University of Kentucky, Lexington, KY, 40536-0082, USA
| | - Christopher S Fry
- Department of Athletic Training and Clinical Nutrition, University of Kentucky, Lexington, KY, 40536-0200, USA
| | - Douglas Paddon-Jones
- Department of Nutrition & Metabolism, Center for Rehabilitation, Physical Activity and Nutrition, University of Texas Medical Branch, Galveston, TX, 77555-1028, USA
| | - Emily J Arentson-Lantz
- Department of Nutrition & Metabolism, Center for Rehabilitation, Physical Activity and Nutrition, University of Texas Medical Branch, Galveston, TX, 77555-1028, USA
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24
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The Role of Glycogen Synthase Kinase-3 in the Regulation of Ribosome Biogenesis in Rat Soleus Muscle under Disuse Conditions. Int J Mol Sci 2022; 23:ijms23052751. [PMID: 35269893 PMCID: PMC8911371 DOI: 10.3390/ijms23052751] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 02/16/2022] [Accepted: 02/28/2022] [Indexed: 02/04/2023] Open
Abstract
It is well-established that prolonged exposure to real or simulated microgravity/disuse conditions results in a significant reduction in the rate of muscle protein synthesis (PS) and loss of muscle mass. Muscle protein synthesis is largely dependent upon translational capacity (ribosome content), the regulation of which is poorly explored under conditions of mechanical unloading. Glycogen synthase kinase-3 (GSK-3) (a negative regulator of PS) is known to be activated in rat soleus muscle under unloading conditions. We hypothesized that inhibition of GSK-3 activity under disuse conditions (hindlimb suspension, HS) would reduce disuse-induced downregulation of ribosome biogenesis in rat soleus muscle. Wistar rats were randomly divided into four groups: (1) vivarium control (C), (2) vivarium control + daily injections (4 mg/kg) of AR-A014418 (GSK-3 inhibitor) for 7 days, (3) 7-day HS, (4) 7-day HS + daily injections (4 mg/kg) of AR-A014418. GSK-3beta and glycogen synthase 1 (GS-1) phosphorylation levels were measured by Western-blotting. The key markers of ribosome biogenesis were assessed via agarose gel-electrophoresis and RT-PCR. The rate of muscle PS was assessed by puromycin-based SUnSET method. As expected, 7-day HS resulted in a significant decrease in the inhibitory Ser9 GSK-3beta phosphorylation and an increase in GS-1 (Ser641) phosphorylation compared to the C group. Treatment of rats with GSK-3 inhibitor prevented HS-induced increase in GS1 (Ser641) phosphorylation, which was indicative of GSK-3 inhibition. Administration of GSK-3 inhibitor partly attenuated disuse-induced downregulation of c-Myc expression as well as decreases in the levels of 45S pre-rRNA and 18S + 28S rRNAs. These AR-A014418-induced alterations in the markers of ribosome biogenesis were paralleled with partial prevention of a decrease in the rate of muscle PS. Thus, inhibition of GSK-3 during 7-day HS is able to partially attenuate the reductions in translational capacity and the rate of PS in rat soleus muscle.
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25
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Moradpour G, Amini M, Moeinvaziri N, Hosseini SV, Rajabi S, Clark CCT, Hosseini B, Vafa L, Haghighat N. Bariatric Surgery and COVID-19: What We Have Learned from the Pandemic in Iran: a Retrospective Observational Cohort Study. Obes Surg 2022; 32:18-25. [PMID: 34716898 PMCID: PMC8556836 DOI: 10.1007/s11695-021-05761-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 10/10/2021] [Accepted: 10/18/2021] [Indexed: 12/24/2022]
Abstract
PURPOSE Little is known about the symptoms of coronavirus disease 2019 (COVID-19) on patients with morbid obesity following bariatric surgery (BS) in Iran. Thus, we sought to investigate the symptoms and effect of COVID-19 in patients with morbid obesity following, or candidates for, BS in Iran. MATERIALS AND METHODS In this retrospective observational cohort study, we enrolled 236 morbid obese patients following (surgical group) or candidates (nonsurgical group) for bariatric surgery. Demographics, probable COVID-19 incidence, acute and persistent COVID-19 symptoms, and clinical outcome parameters of bariatric patients and candidates for BS were compared. The incidence of probable COVID-19 was assessed including the clinical definition of probable case, according to World Health Organization criteria. RESULTS The incidence of probable COVID-19 among surgical and nonsurgical groups was significantly different (20.6% vs 26.08%, respectively, p = 0.046). The probable case of surgical patients had a shorter length of symptoms and hospitalization duration, and a lower proportion of admission in ICUs and hospitals with respect to nonsurgical patients (p < 0.001). Surgical patients had a greater prevalence of persistent symptoms including anorexia, food intolerance, and anosmia-hyposmia than nonsurgical patients. Moreover, surgical patients with probable COVID-19 had a significantly higher proportion of diabetic patients than surgical patients without probable COVID-19 (20% vs 9.3%). CONCLUSION These findings highlight the need to evaluate the persistent symptoms of COVID-19 and the importance of nutritional support for at least several weeks after COVID-19 symptom onset. Moreover, it seems that COVID-19 incidence in post-bariatric surgery patients could reduce the effectiveness of bariatric surgery in the resolution of diabetes.
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Affiliation(s)
- Gholamreza Moradpour
- laparoscopy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Masoud Amini
- laparoscopy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Nader Moeinvaziri
- laparoscopy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Seyed Vahid Hosseini
- laparoscopy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Shirin Rajabi
- laparoscopy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Cain C T Clark
- Centre for Intelligent Healthcare, Coventry University, Coventry, CV1 5FB, UK
| | - Babak Hosseini
- laparoscopy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Leila Vafa
- laparoscopy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Neda Haghighat
- laparoscopy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.
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26
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Leucine-Rich Diet Improved Muscle Function in Cachectic Walker 256 Tumour-Bearing Wistar Rats. Cells 2021; 10:cells10123272. [PMID: 34943780 PMCID: PMC8699792 DOI: 10.3390/cells10123272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 11/11/2021] [Accepted: 11/15/2021] [Indexed: 12/28/2022] Open
Abstract
Skeletal muscle atrophy occurs in several pathological conditions, such as cancer, especially during cancer-induced cachexia. This condition is associated with increased morbidity and poor treatment response, decreased quality of life, and increased mortality in cancer patients. A leucine-rich diet could be used as a coadjutant therapy to prevent muscle atrophy in patients suffering from cancer cachexia. Besides muscle atrophy, muscle function loss is even more important to patient quality of life. Therefore, this study aimed to investigate the potential beneficial effects of leucine supplementation on whole-body functional/movement properties, as well as some markers of muscle breakdown and inflammatory status. Adult Wistar rats were randomly distributed into four experimental groups. Two groups were fed with a control diet (18% protein): Control (C) and Walker 256 tumour-bearing (W), and two other groups were fed with a leucine-rich diet (18% protein + 3% leucine): Leucine Control (L) and Leucine Walker 256 tumour-bearing (LW). A functional analysis (walking, behaviour, and strength tests) was performed before and after tumour inoculation. Cachexia parameters such as body weight loss, muscle and fat mass, pro-inflammatory cytokine profile, and molecular and morphological aspects of skeletal muscle were also determined. As expected, Walker 256 tumour growth led to muscle function decline, cachexia manifestation symptoms, muscle fibre cross-section area reduction, and classical muscle protein degradation pathway activation, with upregulation of FoxO1, MuRF-1, and 20S proteins. On the other hand, despite having no effect on the walking test, inflammation status or muscle oxidative capacity, the leucine-rich diet improved muscle strength and behaviour performance, maintained body weight, fat and muscle mass and decreased some protein degradation markers in Walker 256 tumour-bearing rats. Indeed, a leucine-rich diet alone could not completely revert cachexia but could potentially diminish muscle protein degradation, leading to better muscle functional performance in cancer cachexia.
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27
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Angiotensin II inhibition: a potential treatment to slow the progression of sarcopenia. Clin Sci (Lond) 2021; 135:2503-2520. [PMID: 34751393 DOI: 10.1042/cs20210719] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 10/21/2021] [Accepted: 10/29/2021] [Indexed: 02/07/2023]
Abstract
Sarcopenia is defined as the progressive and generalized loss of skeletal muscle mass and strength, which is associated with increased likelihood of adverse outcomes including falls, fractures, physical disability, and mortality. The etiology of sarcopenia has been postulated to be multifactorial with genetics, aging, immobility, nutritional deficiencies, inflammation, stress, and endocrine factors all contributing to the imbalance of muscle anabolism and catabolism. The prevalence of sarcopenia is estimated to range from 13 to 24% in adults over 60 years of age and up to 50% in persons aged 80 and older. As the population continues to age, the prevalence of sarcopenia continues to increase and is expected to affect 500 million people by the year 2050. Sarcopenia impacts the overall health of patients through limitations in functional status, increase in hospital readmissions, poorer hospital outcomes, and increase in overall mortality. Thus, there exists a need to prevent or reduce the occurrence of sarcopenia. Here, we explore the potential mechanisms and current studies regarding angiotensin receptor blockers (ARBs) and angiotensin-converting enzyme (ACE) inhibitors on reducing the development of sarcopenia through the associated changes in cardiovascular function, renal function, muscle fiber composition, inflammation, endothelial dysfunction, metabolic efficiency, and mitochondrial function.
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28
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Petrocelli JJ, Mahmassani ZS, Fix DK, Montgomery JA, Reidy PT, McKenzie AI, de Hart NM, Ferrara PJ, Kelley JJ, Eshima H, Funai K, Drummond MJ. Metformin and leucine increase satellite cells and collagen remodeling during disuse and recovery in aged muscle. FASEB J 2021; 35:e21862. [PMID: 34416035 DOI: 10.1096/fj.202100883r] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 07/28/2021] [Accepted: 08/04/2021] [Indexed: 11/11/2022]
Abstract
Loss of muscle mass and strength after disuse followed by impaired muscle recovery commonly occurs with aging. Metformin (MET) and leucine (LEU) individually have shown positive effects in skeletal muscle during atrophy conditions but have not been evaluated in combination nor tested as a remedy to enhance muscle recovery following disuse atrophy in aging. The purpose of this study was to determine if a dual treatment of metformin and leucine (MET + LEU) would prevent disuse-induced atrophy and/or promote muscle recovery in aged mice and if these muscle responses correspond to changes in satellite cells and collagen remodeling. Aged mice (22-24 months) underwent 14 days of hindlimb unloading (HU) followed by 7 or 14 days of reloading (7 or 14 days RL). MET, LEU, or MET + LEU was administered via drinking water and were compared to Vehicle (standard drinking water) and ambulatory baseline. We observed that during HU, MET + LEU resolved whole body grip strength and soleus muscle specific force decrements caused by HU. Gastrocnemius satellite cell abundance was increased with MET + LEU treatment but did not alter muscle size during disuse or recovery conditions. Moreover, MET + LEU treatment alleviated gastrocnemius collagen accumulation caused by HU and increased collagen turnover during 7 and 14 days RL driven by a decrease in collagen IV content. Transcriptional pathway analysis revealed that MET + LEU altered muscle hallmark pathways related to inflammation and myogenesis during HU. Together, the dual treatment of MET and LEU was able to increase muscle function, satellite cell content, and reduce collagen accumulation, thus improving muscle quality during disuse and recovery in aging.
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Affiliation(s)
- Jonathan J Petrocelli
- Department of Physical Therapy & Athletic Training, University of Utah, Salt Lake City, Utah, USA
| | - Ziad S Mahmassani
- Department of Physical Therapy & Athletic Training, University of Utah, Salt Lake City, Utah, USA
| | - Dennis K Fix
- Department of Physical Therapy & Athletic Training, University of Utah, Salt Lake City, Utah, USA
| | | | - Paul T Reidy
- Department of Kinesiology, Nutrition and Health, Miami University, Oxford, Ohio, USA
| | - Alec I McKenzie
- Department of Internal Medicine, University of Utah, Salt Lake City, Utah, USA
| | - Naomi M de Hart
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA
| | - Patrick J Ferrara
- Molecular Medicine Program, University of Utah, Salt Lake City, Utah, USA
| | - Joshua J Kelley
- Department of Physical Therapy & Athletic Training, University of Utah, Salt Lake City, Utah, USA
| | - Hiroaki Eshima
- Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA
| | - Katsuhiko Funai
- Department of Physical Therapy & Athletic Training, University of Utah, Salt Lake City, Utah, USA.,Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA.,Molecular Medicine Program, University of Utah, Salt Lake City, Utah, USA
| | - Micah J Drummond
- Department of Physical Therapy & Athletic Training, University of Utah, Salt Lake City, Utah, USA.,Molecular Medicine Program, University of Utah, Salt Lake City, Utah, USA
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29
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Juhl OJ, Buettmann EG, Friedman MA, DeNapoli RC, Hoppock GA, Donahue HJ. Update on the effects of microgravity on the musculoskeletal system. NPJ Microgravity 2021; 7:28. [PMID: 34301942 PMCID: PMC8302614 DOI: 10.1038/s41526-021-00158-4] [Citation(s) in RCA: 56] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 06/28/2021] [Indexed: 02/07/2023] Open
Abstract
With the reignited push for manned spaceflight and the development of companies focused on commercializing spaceflight, increased human ventures into space are inevitable. However, this venture would not be without risk. The lower gravitational force, known as microgravity, that would be experienced during spaceflight significantly disrupts many physiological systems. One of the most notably affected systems is the musculoskeletal system, where exposure to microgravity causes both bone and skeletal muscle loss, both of which have significant clinical implications. In this review, we focus on recent advancements in our understanding of how exposure to microgravity affects the musculoskeletal system. We will focus on the catabolic effects microgravity exposure has on both bone and skeletal muscle cells, as well as their respective progenitor stem cells. Additionally, we report on the mechanisms that underlie bone and muscle tissue loss resulting from exposure to microgravity and then discuss current countermeasures being evaluated. We reveal the gaps in the current knowledge and expound upon how current research is filling these gaps while also identifying new avenues of study as we continue to pursue manned spaceflight.
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Affiliation(s)
- Otto J Juhl
- Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Evan G Buettmann
- Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Michael A Friedman
- Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Rachel C DeNapoli
- Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Gabriel A Hoppock
- Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, VA, USA
| | - Henry J Donahue
- Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, VA, USA.
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30
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Fernandez-Gonzalo R, McDonnell AC, Simpson EJ, Macdonald IA, Rullman E, Mekjavic IB. Substantial and Reproducible Individual Variability in Skeletal Muscle Outcomes in the Cross-Over Designed Planica Bed Rest Program. Front Physiol 2021; 12:676501. [PMID: 34335293 PMCID: PMC8322684 DOI: 10.3389/fphys.2021.676501] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Accepted: 06/25/2021] [Indexed: 12/21/2022] Open
Abstract
To evaluate the individual responses in skeletal muscle outcomes following bed rest, data from three studies (21-day PlanHab; 10-day FemHab and LunHab) were combined. Subjects (n = 35) participated in three cross-over campaigns within each study: normoxic (NBR) and hypoxic bed rest (HBR), and hypoxic ambulation (HAMB; used as control). Individual variability (SDIR) was investigated as √(SDExp 2 -SDCon 2 ), where SDExp and SDCon are the standard deviations of the change score (i.e., post - pre) in the experimental (NBR and HBR) and the control (HAMB) groups, respectively. Repeatability and moderators of the individual variability were explored. Significant SDIR was detected for knee extension torque, and thigh and calf muscle area, which translated into an individual response ranging from 3 to -17% for knee extension torque, -2 to -12% for calf muscle area, and -1 to -8% for thigh muscle area. Strong correlations were found for changes in NBR vs. HBR (i.e., repeatability) in thigh and calf muscle area (r = 0.65-0.75, P < 0.0001). Change-scores in knee extension torque, and thigh and calf muscle area strongly correlated with baseline values (P < 0.001; r between -0.5 and -0.9). Orthogonal partial least squares regression analysis explored if changes in the investigated variables could predict calf muscle area alterations. This analysis indicated that 43% of the variance in calf muscle area could be attributed to changes in all of the other variables. This is the first study using a validated methodology to report clinically relevant individual variability after bed rest in knee extension torque, calf muscle area, and (to a lower extent) thigh muscle area. Baseline values emerged as a moderator of the individual response, and a global bed rest signature served as a moderately strong predictor of the individual variation in calf muscle area alterations.
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Affiliation(s)
- Rodrigo Fernandez-Gonzalo
- Department of Laboratory Medicine, Division of Clinical Physiology, Karolinska Institutet, and Unit of Clinical Physiology, Karolinska University Hospital, Stockholm, Sweden
| | - Adam C. McDonnell
- Department of Automation, Biocybernetics and Robotics, Jozef Stefan Institute, Ljubljana, Slovenia
| | - Elizabeth J. Simpson
- MRC Arthritis Research UK Centre for Musculoskeletal Ageing Research, School of Life Sciences, University of Nottingham Medical School, Nottingham, United Kingdom
| | - Ian A. Macdonald
- MRC Arthritis Research UK Centre for Musculoskeletal Ageing Research, School of Life Sciences, University of Nottingham Medical School, Nottingham, United Kingdom
| | - Eric Rullman
- Department of Laboratory Medicine, Division of Clinical Physiology, Karolinska Institutet, and Unit of Clinical Physiology, Karolinska University Hospital, Stockholm, Sweden
| | - Igor B. Mekjavic
- Department of Automation, Biocybernetics and Robotics, Jozef Stefan Institute, Ljubljana, Slovenia
- Department of Biomedical Physiology and Kinesiology, Simon Fraser University, Burnaby, BC, Canada
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31
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The effects of glucagon and the target of rapamycin (TOR) on skeletal muscle protein synthesis and age-dependent sarcopenia in humans. Clin Nutr ESPEN 2021; 44:15-25. [PMID: 34330459 DOI: 10.1016/j.clnesp.2021.06.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Accepted: 06/21/2021] [Indexed: 01/07/2023]
Abstract
BACKGROUND AND AIMS Human target of rapamycin (TOR) is a kinase that stimulates protein synthesis in the skeletal muscle in response to amino acids and physical activity. METHODS A comprehensive literature search was conducted on the PubMed database from its inception up to May 2021 to retrieve information on the effects of TOR and glucagon on muscle function. Articles written in English regarding human subjects were included. RESULTS l-leucine activates TOR to initiate protein synthesis in the skeletal muscle. Glucagon has a crucial role suppressing skeletal muscle protein synthesis by increasing l-leucine oxidation and the irreversible loss of this amino acid. Glucagon-induced l-leucine oxidation suppresses TOR and attenuates the ability of skeletal muscle to synthesize proteins. Conditions associated with increased glucagon secretion typically feature reduced ability to synthesize proteins in the skeletal muscle that may evolve into sarcopenia. Animal protein ingestion, unlike vegetable protein, stimulates glucagon secretion. High intake of animal protein increases l-leucine oxidation and promotes the use of amino acids as fuel. Sarcopenia and arterial stiffness characteristically occur together in conditions featuring insulin resistance, such as aging. Insulin resistance mediates the relationship between aging and sarcopenia and arterial stiffness. The loss of skeletal muscle fibers that characterizes sarcopenia is followed by collagen and lipid accumulation. Likewise, insulin resistance is associated with arterial stiffness and intima-media thickening due to adaptive accretion of collagen and lipids in the arterial wall. CONCLUSIONS Human TOR participates in the pathogenesis of sarcopenia and arterial stiffness, although its effects remain to be fully elucidated.
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32
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Soendenbroe C, Andersen JL, Mackey AL. Muscle-nerve communication and the molecular assessment of human skeletal muscle denervation with aging. Am J Physiol Cell Physiol 2021; 321:C317-C329. [PMID: 34161153 DOI: 10.1152/ajpcell.00174.2021] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Muscle fiber denervation is a major contributor to the decline in physical function observed with aging. Denervation can occur through breakdown of the neuromuscular junctions (NMJ) itself, affecting only that particular fiber, or through the death of a motor neuron, which can lead to a loss of all the muscle fibers in that motor unit. In this review, we discuss the muscle-nerve relationship, where signaling from both the motor neuron and the muscle fiber is required for maximal preservation of neuromuscular function in old age. Physical activity is likely to be the most important single factor that can contribute to this preservation. Furthermore, we propose that inactivity is not an innocent bystander, but plays an active role in denervation through the production of signals hostile to neuron survival. Investigating denervation in human muscle tissue samples is challenging due to the shared protein profile of regenerating and denervated muscle fibers. In this review, we provide a detailed overview of the key traits observed in immunohistochemical preparations of muscle biopsies from healthy, young, and elderly individuals. Overall, a combination of assessing tissue samples, circulating biomarkers, and electrophysiological assessments in humans will prove fruitful in the quest to gain more understanding of denervation of skeletal muscle. In addition, cell culture models represent a valuable tool in the search for key signaling factors exchanged between muscle and nerve, and which exercise has the capacity to alter.
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Affiliation(s)
- Casper Soendenbroe
- Department of Orthopedic Surgery, Institute of Sports Medicine Copenhagen, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Copenhagen, Denmark.,Xlab, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Medicine, Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark
| | - Jesper L Andersen
- Department of Orthopedic Surgery, Institute of Sports Medicine Copenhagen, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Copenhagen, Denmark.,Department of Clinical Medicine, Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark
| | - Abigail L Mackey
- Department of Orthopedic Surgery, Institute of Sports Medicine Copenhagen, Copenhagen University Hospital - Bispebjerg and Frederiksberg, Copenhagen, Denmark.,Xlab, Department of Biomedical Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.,Department of Clinical Medicine, Center for Healthy Aging, University of Copenhagen, Copenhagen, Denmark
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Arentson-Lantz EJ, Kilroe S. Practical applications of whey protein in supporting skeletal muscle maintenance, recovery, and reconditioning. J Anim Sci 2021; 99:6149525. [PMID: 33630061 DOI: 10.1093/jas/skab060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 02/22/2021] [Indexed: 12/11/2022] Open
Abstract
Like humans, many companion animals experience a gradual decline in skeletal muscle mass and function during later years of life. This process, analogous to sarcopenia in humans, increases risk for morbidity and mortality. Periods of reduced activity due to injury or illness, followed by an incomplete recovery, can accelerate the loss of muscle mass and function. Emerging research from human studies suggests that moderate amounts of high-quality protein may attenuate the loss of muscle, while preventing accumulation of fat during periods of disuse. Whey protein is a consumer-friendly and readily available source of high-quality protein. It supports skeletal muscle maintenance during normal aging and may also provide anabolic support during periods of illness, injury, and recovery. Ongoing research efforts continue to refine our understanding of how protein quality, quantity, and meal timing can be optimized to support retention of muscle mass and function during aging. Priority research areas include supplementation with high-quality protein during illness/injury to stimulate anabolism by targeting molecular mechanisms that regulate skeletal muscle metabolism.
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Affiliation(s)
- Emily J Arentson-Lantz
- Department of Nutrition and Metabolism, Center for Recovery, Physical Activity and Nutrition, University of Texas Medical Branch, Galveston, TX 77555-1028, USA
| | - Sean Kilroe
- Department of Nutrition and Metabolism, Center for Recovery, Physical Activity and Nutrition, University of Texas Medical Branch, Galveston, TX 77555-1028, USA.,Department of Sports and Health Sciences, College of Life and Environmental Science, University of Exeter, Exeter, UK
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34
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Arentson-Lantz EJ, Mikovic J, Bhattarai N, Fry CS, Lamon S, Porter C, Paddon-Jones D. Leucine augments specific skeletal muscle mitochondrial respiratory pathways during recovery following 7 days of physical inactivity in older adults. J Appl Physiol (1985) 2021; 130:1522-1533. [PMID: 33764170 DOI: 10.1152/japplphysiol.00810.2020] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
In older adults, leucine mitigated the loss of insulin sensitivity associated with muscular disuse. Leucine supplementation increased mitochondrial respiration and reduced a marker of oxidative stress following periods of disuse and rehabilitation.
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Affiliation(s)
- Emily J Arentson-Lantz
- Department of Nutrition and Metabolism, University of Texas Medical Branch, Galveston, Texas.,Center for Recovery, Physical Activity and Nutrition, University of Texas Medical Branch, Galveston, Texas
| | - Jasmine Mikovic
- Faculty of Health, Institute for Physical Activity and Nutrition (IPAN), Deakin University, Melbourne, Victoria, Australia
| | - Nisha Bhattarai
- Deparment of Surgery, University of Texas Medical Branch, Galveston, Texas
| | - Christopher S Fry
- Department of Nutrition and Metabolism, University of Texas Medical Branch, Galveston, Texas.,Center for Recovery, Physical Activity and Nutrition, University of Texas Medical Branch, Galveston, Texas
| | - Séverine Lamon
- Faculty of Health, Institute for Physical Activity and Nutrition (IPAN), Deakin University, Melbourne, Victoria, Australia
| | - Craig Porter
- Deparment of Surgery, University of Texas Medical Branch, Galveston, Texas
| | - Douglas Paddon-Jones
- Department of Nutrition and Metabolism, University of Texas Medical Branch, Galveston, Texas.,Center for Recovery, Physical Activity and Nutrition, University of Texas Medical Branch, Galveston, Texas
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35
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Sánchez C, Franco L, Regal P, Lamas A, Cepeda A, Fente C. Breast Milk: A Source of Functional Compounds with Potential Application in Nutrition and Therapy. Nutrients 2021; 13:1026. [PMID: 33810073 PMCID: PMC8005182 DOI: 10.3390/nu13031026] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 03/09/2021] [Accepted: 03/18/2021] [Indexed: 12/12/2022] Open
Abstract
Breast milk is an unbeatable food that covers all the nutritional requirements of an infant in its different stages of growth up to six months after birth. In addition, breastfeeding benefits both maternal and child health. Increasing knowledge has been acquired regarding the composition of breast milk. Epidemiological studies and epigenetics allow us to understand the possible lifelong effects of breastfeeding. In this review we have compiled some of the components with clear functional activity that are present in human milk and the processes through which they promote infant development and maturation as well as modulate immunity. Milk fat globule membrane, proteins, oligosaccharides, growth factors, milk exosomes, or microorganisms are functional components to use in infant formulas, any other food products, nutritional supplements, nutraceuticals, or even for the development of new clinical therapies. The clinical evaluation of these compounds and their commercial exploitation are limited by the difficulty of isolating and producing them on an adequate scale. In this work we focus on the compounds produced using milk components from other species such as bovine, transgenic cattle capable of expressing components of human breast milk or microbial culture engineering.
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Affiliation(s)
- Cristina Sánchez
- Pharmacy Faculty, San Pablo-CEU University, 28003 Madrid, Spain;
| | - Luis Franco
- Medicine Faculty, Santiago de Compostela University, 15782 Santiago de Compostela, Spain;
| | - Patricia Regal
- Department of Analytical Chemistry, Nutrition and Bromatology, Santiago de Compostela University, 27002 Lugo, Spain; (P.R.); (A.L.); (A.C.)
| | - Alexandre Lamas
- Department of Analytical Chemistry, Nutrition and Bromatology, Santiago de Compostela University, 27002 Lugo, Spain; (P.R.); (A.L.); (A.C.)
| | - Alberto Cepeda
- Department of Analytical Chemistry, Nutrition and Bromatology, Santiago de Compostela University, 27002 Lugo, Spain; (P.R.); (A.L.); (A.C.)
| | - Cristina Fente
- Department of Analytical Chemistry, Nutrition and Bromatology, Santiago de Compostela University, 27002 Lugo, Spain; (P.R.); (A.L.); (A.C.)
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36
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Kilroe SP, Fulford J, Jackman S, Holwerda A, Gijsen A, van Loon L, Wall BT. Dietary protein intake does not modulate daily myofibrillar protein synthesis rates or loss of muscle mass and function during short-term immobilization in young men: a randomized controlled trial. Am J Clin Nutr 2021; 113:548-561. [PMID: 32469388 DOI: 10.1093/ajcn/nqaa136] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 05/12/2020] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Short-term (<1 wk) muscle disuse lowers daily myofibrillar protein synthesis (MyoPS) rates resulting in muscle mass loss. The understanding of how daily dietary protein intake influences such muscle deconditioning requires further investigation. OBJECTIVES To assess the influence of graded dietary protein intakes on daily MyoPS rates and the loss of muscle mass during 3 d of disuse. METHODS Thirty-three healthy young men (aged 22 ± 1 y; BMI = 23 ± 1 kg/m2) initially consumed the same standardized diet for 5 d, providing 1.6 g protein/kg body mass/d. Thereafter, participants underwent a 3-d period of unilateral leg immobilization during which they were randomly assigned to 1 of 3 eucaloric diets containing relatively high, low, or no protein (HIGH: 1.6, LOW: 0.5, NO: 0.15 g protein/kg/d; n = 11 per group). One day prior to immobilization participants ingested 400 mL deuterated water (D2O) with 50-mL doses consumed daily thereafter. Prior to and immediately after immobilization upper leg bilateral MRI scans and vastus lateralis muscle biopsies were performed to measure quadriceps muscle volume and daily MyoPS rates, respectively. RESULTS Quadriceps muscle volume of the control legs remained unchanged throughout the experiment (P > 0.05). Immobilization led to 2.3 ± 0.4%, 2.7 ± 0.2%, and 2.0 ± 0.4% decreases in quadriceps muscle volume (P < 0.05) of the immobilized leg in the HIGH, LOW, and NO groups (P < 0.05), respectively, with no significant differences between groups (P > 0.05). D2O ingestion resulted in comparable plasma free [2H]-alanine enrichments during immobilization (∼2.5 mole percentage excess) across groups (P > 0.05). Daily MyoPS rates during immobilization were 30 ± 2% (HIGH), 26 ± 3% (LOW), and 27 ± 2% (NO) lower in the immobilized compared with the control leg, with no significant differences between groups (P > 0.05). CONCLUSIONS Three days of muscle disuse induces considerable declines in muscle mass and daily MyoPS rates. However, daily protein intake does not modulate any of these muscle deconditioning responses.Clinical trial registry number: NCT03797781.
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Affiliation(s)
- Sean Paul Kilroe
- Department of Sport and Health Sciences, College of Life and Environmental Science, University of Exeter, Exeter, UK
| | - Jonathan Fulford
- University of Exeter Medical School, University of Exeter, Exeter, UK
| | - Sarah Jackman
- Department of Sport and Health Sciences, College of Life and Environmental Science, University of Exeter, Exeter, UK
| | - Andrew Holwerda
- Department of Human Biology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Annemie Gijsen
- Department of Human Biology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Luc van Loon
- Department of Human Biology, NUTRIM School of Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Benjamin Toby Wall
- Department of Sport and Health Sciences, College of Life and Environmental Science, University of Exeter, Exeter, UK
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37
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Ten Have GAM, Jansen L, Schooneman MG, Engelen MPKJ, Deutz NEP. Metabolic flux analysis of branched-chain amino and keto acids (BCAA, BCKA) and β-hydroxy β-methylbutyric acid across multiple organs in the pig. Am J Physiol Endocrinol Metab 2021; 320:E629-E640. [PMID: 33522397 DOI: 10.1152/ajpendo.00384.2020] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Branched-chain amino acids (BCAA) and their metabolites the branched-chain keto acids (BCKA) and β-hydroxy β-methylbutyric acid (HMB) are involved in the regulation of key signaling pathways in the anabolic response to a meal. However, their (inter)organ kinetics remain unclear. Therefore, branched-chain amino acids (BCAA) [leucine (Leu), valine (Val), isoleucine (Ile)], BCKA [α-ketoisocaproic acid (KIC), 3-methyl-2-oxovaleric acid (KMV), 2-oxoisovalerate (KIV)], and HMB across organ net fluxes were measured. In multi-catheterized pigs (n = 12, ±25 kg), net fluxes across liver, portal drained viscera (PDV), kidney, and hindquarter (HQ, muscle compartment) were measured before and 4 h after bolus feeding of a complete meal (30% daily intake) in conscious state. Arterial and venous plasma were collected and concentrations were measured by LC- or GC-MS/MS. Data are expressed as mean [95% CI] and significance (P < 0.05) from zero by the Wilcoxon Signed Rank Test. In the postabsorptive state (in nmol/kg body wt/min), the kidney takes up HMB (3.2[1.3,5.0]) . BCKA is taken up by PDV (144[13,216]) but no release by other organs. In the postprandial state, the total net fluxes over 4 h (in µmol/kg body wt/4 h) showed a release of all BCKA by HQ (46.2[34.2,58.2]), KIC by the PDV (12.3[7.0,17.6]), and KIV by the kidney (10.0[2.3,178]). HMB was released by the liver (0.76[0.49,1.0]). All BCKA were taken up by the liver (200[133,268]). Substantial differences are present in (inter)organ metabolism and transport among the BCAA and its metabolites BCKA and HMB. The presented data in a translation animal model are relevant for the future development of optimized clinical nutrition.NEW & NOTEWORTHY Branched-chain amino acids (BCAA) and their metabolites the branched-chain keto acids (BCKA) and β-hydroxy β-methylbutyric acid (HMB) are involved in the regulation of key signaling pathways in the anabolic response to a meal. Substantial differences are present in (inter)organ metabolism and transport among the BCAA and its metabolites BCKA and HMB. The presented data in a translation animal model are relevant for the future development of optimized clinical nutrition.
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Affiliation(s)
- Gabriella A M Ten Have
- Center for Translational Research in Aging & Longevity, Department of Health & Kinesiology, Texas A&M University. College Station, Texas
| | - Lisa Jansen
- Center for Translational Research in Aging & Longevity, Department of Health & Kinesiology, Texas A&M University. College Station, Texas
| | - Marieke G Schooneman
- Department of Endocrinology and Metabolism, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Marielle P K J Engelen
- Center for Translational Research in Aging & Longevity, Department of Health & Kinesiology, Texas A&M University. College Station, Texas
| | - Nicolaas E P Deutz
- Center for Translational Research in Aging & Longevity, Department of Health & Kinesiology, Texas A&M University. College Station, Texas
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Fenner BP, Darden DB, Kelly LS, Rincon J, Brakenridge SC, Larson SD, Moore FA, Efron PA, Moldawer LL. Immunological Endotyping of Chronic Critical Illness After Severe Sepsis. Front Med (Lausanne) 2021; 7:616694. [PMID: 33659259 PMCID: PMC7917137 DOI: 10.3389/fmed.2020.616694] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 12/14/2020] [Indexed: 12/15/2022] Open
Abstract
Improved management of severe sepsis has been one of the major health care accomplishments of the last two decades. Due to enhanced recognition and improved management of severe sepsis, in-hospital mortality has been reduced by up to 40%. With that good news, a new syndrome has unfortunately replaced in-hospital multi-organ failure and death. This syndrome of chronic critical illness (CCI) includes sepsis patients who survive the early "cytokine or genomic storm," but fail to fully recover, and progress into a persistent state of manageable organ injury requiring prolonged intensive care. These patients are commonly discharged to long-term care facilities where sepsis recidivism is high. As many as 33% of sepsis survivors develop CCI. CCI is the result, at least in part, of a maladaptive host response to chronic pattern-recognition receptor (PRR)-mediated processes. This maladaptive response results in dysregulated myelopoiesis, chronic inflammation, T-cell atrophy, T-cell exhaustion, and the expansion of suppressor cell functions. We have defined this panoply of host responses as a persistent inflammatory, immune suppressive and protein catabolic syndrome (PICS). Why is this important? We propose that PICS in survivors of critical illness is its own common, unique immunological endotype driven by the constant release of organ injury-associated, endogenous alarmins, and microbial products from secondary infections. While this syndrome can develop as a result of a diverse set of pathologies, it represents a shared outcome with a unique underlying pathobiological mechanism. Despite being a common outcome, there are no therapeutic interventions other than supportive therapies for this common disorder. Only through an improved understanding of the immunological endotype of PICS can rational therapeutic interventions be designed.
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Affiliation(s)
- Brittany P Fenner
- Department of Surgery, Sepsis and Critical Illness Research Center, University of Florida College of Medicine, Gainesville, FL, United States
| | - D B Darden
- Department of Surgery, Sepsis and Critical Illness Research Center, University of Florida College of Medicine, Gainesville, FL, United States
| | - Lauren S Kelly
- Department of Surgery, Sepsis and Critical Illness Research Center, University of Florida College of Medicine, Gainesville, FL, United States
| | - Jaimar Rincon
- Department of Surgery, Sepsis and Critical Illness Research Center, University of Florida College of Medicine, Gainesville, FL, United States
| | - Scott C Brakenridge
- Department of Surgery, Sepsis and Critical Illness Research Center, University of Florida College of Medicine, Gainesville, FL, United States
| | - Shawn D Larson
- Department of Surgery, Sepsis and Critical Illness Research Center, University of Florida College of Medicine, Gainesville, FL, United States
| | - Frederick A Moore
- Department of Surgery, Sepsis and Critical Illness Research Center, University of Florida College of Medicine, Gainesville, FL, United States
| | - Philip A Efron
- Department of Surgery, Sepsis and Critical Illness Research Center, University of Florida College of Medicine, Gainesville, FL, United States
| | - Lyle L Moldawer
- Department of Surgery, Sepsis and Critical Illness Research Center, University of Florida College of Medicine, Gainesville, FL, United States
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Lamon S, Morabito A, Arentson-Lantz E, Knowles O, Vincent GE, Condo D, Alexander SE, Garnham A, Paddon-Jones D, Aisbett B. The effect of acute sleep deprivation on skeletal muscle protein synthesis and the hormonal environment. Physiol Rep 2021; 9:e14660. [PMID: 33400856 PMCID: PMC7785053 DOI: 10.14814/phy2.14660] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Accepted: 11/08/2020] [Indexed: 12/18/2022] Open
Abstract
Chronic sleep loss is a potent catabolic stressor, increasing the risk of metabolic dysfunction and loss of muscle mass and function. To provide mechanistic insight into these clinical outcomes, we sought to determine if acute sleep deprivation blunts skeletal muscle protein synthesis and promotes a catabolic environment. Healthy young adults (N = 13; seven male, six female) were subjected to one night of total sleep deprivation (DEP) and normal sleep (CON) in a randomized cross‐over design. Anabolic and catabolic hormonal profiles were assessed across the following day. Postprandial muscle protein fractional synthesis rate (FSR) was assessed between 13:00 and 15:00 and gene markers of muscle protein degradation were assessed at 13:00. Acute sleep deprivation reduced muscle protein synthesis by 18% (CON: 0.072 ± 0.015% vs. DEP: 0.059 ± 0.014%·h‐1, p = .040). In addition, sleep deprivation increased plasma cortisol by 21% (p = .030) and decreased plasma testosterone by 24% (p = .029). No difference was found in the markers of protein degradation. A single night of total sleep deprivation is sufficient to induce anabolic resistance and a procatabolic environment. These acute changes may represent mechanistic precursors driving the metabolic dysfunction and body composition changes associated with chronic sleep deprivation.
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Affiliation(s)
- Séverine Lamon
- Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia
| | - Aimee Morabito
- Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia
| | - Emily Arentson-Lantz
- Department of Nutrition and Metabolism, University of Texas Medical Branch, Galveston, TX, USA
| | - Olivia Knowles
- Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia
| | | | - Dominique Condo
- Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia.,Center for Sport Research (CSR), School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia
| | - Sarah Elizabeth Alexander
- Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia
| | - Andrew Garnham
- Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia
| | - Douglas Paddon-Jones
- Department of Nutrition and Metabolism, University of Texas Medical Branch, Galveston, TX, USA
| | - Brad Aisbett
- Institute for Physical Activity and Nutrition (IPAN), School of Exercise and Nutrition Sciences, Deakin University, Geelong, Australia
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Bass JJ, Hardy EJO, Inns TB, Wilkinson DJ, Piasecki M, Morris RH, Spicer A, Sale C, Smith K, Atherton PJ, Phillips BE. Atrophy Resistant vs. Atrophy Susceptible Skeletal Muscles: "aRaS" as a Novel Experimental Paradigm to Study the Mechanisms of Human Disuse Atrophy. Front Physiol 2021; 12:653060. [PMID: 34017264 PMCID: PMC8129522 DOI: 10.3389/fphys.2021.653060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Accepted: 04/01/2021] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVE Disuse atrophy (DA) describes inactivity-induced skeletal muscle loss, through incompletely defined mechanisms. An intriguing observation is that individual muscles exhibit differing degrees of atrophy, despite exhibiting similar anatomical function/locations. We aimed to develop an innovative experimental paradigm to investigate Atrophy Resistant tibialis anterior (TA) and Atrophy Susceptible medial gastrocnemius (MG) muscles (aRaS) with a future view of uncovering central mechanisms. METHOD Seven healthy young men (22 ± 1 year) underwent 15 days unilateral leg immobilisation (ULI). Participants had a single leg immobilised using a knee brace and air-boot to fix the leg (75° knee flexion) and ankle in place. Dual-energy X-ray absorptiometry (DXA), MRI and ultrasound scans of the lower leg were taken before and after the immobilisation period to determine changes in muscle mass. Techniques were developed for conchotome and microneedle TA/MG muscle biopsies following immobilisation (both limbs), and preliminary fibre typing analyses was conducted. RESULTS TA/MG muscles displayed comparable fibre type distribution of predominantly type I fibres (TA 67 ± 7%, MG 63 ± 5%). Following 15 days immobilisation, MG muscle volume (-2.8 ± 1.4%, p < 0.05) and muscle thickness decreased (-12.9 ± 1.6%, p < 0.01), with a positive correlation between changes in muscle volume and thickness (R2 = 0.31, p = 0.038). Importantly, both TA muscle volume and thickness remained unchanged. CONCLUSION The use of this unique "aRaS" paradigm provides an effective and convenient means by which to study the mechanistic basis of divergent DA susceptibility in humans, which may facilitate new mechanistic insights, and by extension, mitigation of skeletal muscle atrophy during human DA.
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Affiliation(s)
- Joseph J. Bass
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and National Institute for Health Research (NIHR), Nottingham Biomedical Research Centre (BRC), University of Nottingham, Nottingham, United Kingdom
| | - Edward J. O. Hardy
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and National Institute for Health Research (NIHR), Nottingham Biomedical Research Centre (BRC), University of Nottingham, Nottingham, United Kingdom
- Department of Surgery and Anaesthetics, Royal Derby Hospital, Derby, United Kingdom
| | - Thomas B. Inns
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and National Institute for Health Research (NIHR), Nottingham Biomedical Research Centre (BRC), University of Nottingham, Nottingham, United Kingdom
| | - Daniel J. Wilkinson
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and National Institute for Health Research (NIHR), Nottingham Biomedical Research Centre (BRC), University of Nottingham, Nottingham, United Kingdom
| | - Mathew Piasecki
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and National Institute for Health Research (NIHR), Nottingham Biomedical Research Centre (BRC), University of Nottingham, Nottingham, United Kingdom
| | - Robert H. Morris
- School of Science and Technology, Nottingham Trent University, Nottingham, United Kingdom
| | - Abi Spicer
- School of Science and Technology, Nottingham Trent University, Nottingham, United Kingdom
| | - Craig Sale
- Musculoskeletal Physiology Research Group, Sport, Health and Performance Enhancement Research Centre, Nottingham Trent University, Nottingham, United Kingdom
| | - Ken Smith
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and National Institute for Health Research (NIHR), Nottingham Biomedical Research Centre (BRC), University of Nottingham, Nottingham, United Kingdom
| | - Philip J. Atherton
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and National Institute for Health Research (NIHR), Nottingham Biomedical Research Centre (BRC), University of Nottingham, Nottingham, United Kingdom
- Philip J. Atherton,
| | - Bethan E. Phillips
- MRC-Versus Arthritis Centre for Musculoskeletal Ageing Research and National Institute for Health Research (NIHR), Nottingham Biomedical Research Centre (BRC), University of Nottingham, Nottingham, United Kingdom
- *Correspondence: Bethan E. Phillips,
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Alves PKN, Cruz A, Silva WJ, Labeit S, Moriscot AS. Leucine Supplementation Decreases HDAC4 Expression and Nuclear Localization in Skeletal Muscle Fiber of Rats Submitted to Hindlimb Immobilization. Cells 2020; 9:cells9122582. [PMID: 33276563 PMCID: PMC7761616 DOI: 10.3390/cells9122582] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 11/19/2020] [Accepted: 11/26/2020] [Indexed: 02/07/2023] Open
Abstract
In this study we surveyed a rat skeletal muscle RNA-Seq for genes that are induced by hindlimb immobilization and, in turn, become attenuated by leucine supplementation. This approach, in search of leucine-atrophy protection mediating genes, identified histone deacetylase 4 (HDAC4) as highly responsive to both hindlimb immobilization and leucine supplementation. We then examined the impact of leucine on HDAC4 expression, tissue localization, and target genes. A total of 76 male Wistar rats (~280 g) were submitted to hindlimb immobilization and/or leucine supplementation for 3, 7 and 12 days. These animals were euthanized, and soleus muscle was removed for further analysis. RNA-Seq analysis of hindlimb immobilized rats indicated a sharp induction (log2 = 3.4) of HDAC4 expression which was attenuated by leucine supplementation (~50%). Real-time PCR and protein expression analysis by Western blot confirmed increased HDAC4 mRNA after 7 days of hindlimb immobilization and mitigation of induction by leucine supplementation. Regarding the HDAC4 localization, the proportion of positive nuclei was higher in the immobilized group and decreased after leucine supplementation. Also, we found a marked decrease of myogenin and MAFbx-atrogin-1 mRNA levels upon leucine supplementation, while CAMKII and DACH2 mRNA levels were increased by leucine supplementation. Our data suggest that HDAC4 inhibition might be involved in the anti-atrophic effects of leucine.
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Affiliation(s)
- Paula K. N. Alves
- Department of Anatomy, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo 05508000, Brazil; (P.K.N.A.); (A.C.); (W.J.S.)
| | - André Cruz
- Department of Anatomy, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo 05508000, Brazil; (P.K.N.A.); (A.C.); (W.J.S.)
| | - William J. Silva
- Department of Anatomy, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo 05508000, Brazil; (P.K.N.A.); (A.C.); (W.J.S.)
| | - Siegfried Labeit
- Faculty for Clinical Medicine Mannheim of the University of Heidelberg, Institute for Integrative Pathophysiology, Universitätsmedizin Mannheim, 68169 Mannheim, Germany;
- Myomedix GmbH, 69151 Neckargemund, Germany
| | - Anselmo S. Moriscot
- Department of Anatomy, Institute of Biomedical Sciences, University of Sao Paulo, Sao Paulo 05508000, Brazil; (P.K.N.A.); (A.C.); (W.J.S.)
- Correspondence:
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Kirwan R, McCullough D, Butler T, Perez de Heredia F, Davies IG, Stewart C. Sarcopenia during COVID-19 lockdown restrictions: long-term health effects of short-term muscle loss. GeroScience 2020; 42:1547-1578. [PMID: 33001410 PMCID: PMC7528158 DOI: 10.1007/s11357-020-00272-3] [Citation(s) in RCA: 176] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 09/16/2020] [Indexed: 12/16/2022] Open
Abstract
The COVID-19 pandemic is an extraordinary global emergency that has led to the implementation of unprecedented measures in order to stem the spread of the infection. Internationally, governments are enforcing measures such as travel bans, quarantine, isolation, and social distancing leading to an extended period of time at home. This has resulted in reductions in physical activity and changes in dietary intakes that have the potential to accelerate sarcopenia, a deterioration of muscle mass and function (more likely in older populations), as well as increases in body fat. These changes in body composition are associated with a number of chronic, lifestyle diseases including cardiovascular disease (CVD), diabetes, osteoporosis, frailty, cognitive decline, and depression. Furthermore, CVD, diabetes, and elevated body fat are associated with greater risk of COVID-19 infection and more severe symptomology, underscoring the importance of avoiding the development of such morbidities. Here we review mechanisms of sarcopenia and their relation to the current data on the effects of COVID-19 confinement on physical activity, dietary habits, sleep, and stress as well as extended bed rest due to COVID-19 hospitalization. The potential of these factors to lead to an increased likelihood of muscle loss and chronic disease will be discussed. By offering a number of home-based strategies including resistance exercise, higher protein intakes and supplementation, we can potentially guide public health authorities to avoid a lifestyle disease and rehabilitation crisis post-COVID-19. Such strategies may also serve as useful preventative measures for reducing the likelihood of sarcopenia in general and in the event of future periods of isolation.
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Affiliation(s)
- Richard Kirwan
- School of Biological and Environmental Sciences, Liverpool John Moores University, Liverpool, UK.
| | - Deaglan McCullough
- Research Institute of Sport and Exercise Science, Liverpool John Moores University, Liverpool, UK
| | - Tom Butler
- Department of Clinical Sciences and Nutrition, University of Chester, Chester, UK.
| | - Fatima Perez de Heredia
- School of Biological and Environmental Sciences, Liverpool John Moores University, Liverpool, UK
| | - Ian G Davies
- Research Institute of Sport and Exercise Science, Liverpool John Moores University, Liverpool, UK
| | - Claire Stewart
- Research Institute of Sport and Exercise Science, Liverpool John Moores University, Liverpool, UK
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Petrocelli JJ, Drummond MJ. PGC-1α-Targeted Therapeutic Approaches to Enhance Muscle Recovery in Aging. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17228650. [PMID: 33233350 PMCID: PMC7700690 DOI: 10.3390/ijerph17228650] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 11/18/2020] [Accepted: 11/19/2020] [Indexed: 12/12/2022]
Abstract
Impaired muscle recovery (size and strength) following a disuse period commonly occurs in older adults. Many of these individuals are not able to adequately exercise due to pain and logistic barriers. Thus, nutritional and pharmacological therapeutics, that are translatable, are needed to promote muscle recovery following disuse in older individuals. Peroxisome proliferator-activated receptor gamma coactivator 1-alpha (PGC-1α) may be a suitable therapeutic target due to pleiotropic regulation of skeletal muscle. This review focuses on nutritional and pharmacological interventions that target PGC-1α and related Sirtuin 1 (SIRT1) and 5' AMP-activated protein kinase (AMPKα) signaling in muscle and thus may be rapidly translated to prevent muscle disuse atrophy and promote recovery. In this review, we present several therapeutics that target PGC-1α in skeletal muscle such as leucine, β-hydroxy-β-methylbuyrate (HMB), arginine, resveratrol, metformin and combination therapies that may have future application to conditions of disuse and recovery in humans.
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Edwards SJ, Smeuninx B, Mckendry J, Nishimura Y, Luo D, Marshall RN, Perkins M, Ramsay J, Joanisse S, Philp A, Breen L. High-dose leucine supplementation does not prevent muscle atrophy or strength loss over 7 days of immobilization in healthy young males. Am J Clin Nutr 2020; 112:1368-1381. [PMID: 32910813 DOI: 10.1093/ajcn/nqaa229] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 07/23/2020] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Unavoidable periods of disuse lead to muscle atrophy and functional decline. Preventing such declines can reduce the risk of re-injury and improve recovery of normal physiological functioning. OBJECTIVES We aimed to determine the effectiveness of high-dose leucine supplementation on muscle morphology and strength during 7 d of unilateral lower-limb immobilization, and the role of myofibrillar (MyoPS) and mitochondrial (MitoPS) protein synthesis in disuse atrophy. METHODS Sixteen healthy males (mean ± SEM age: 23 ± 1 y) underwent 7 d of unilateral lower-limb immobilization, with thrice-daily leucine (LEU; n = 8) or placebo (PLA; n = 8) supplementation (15 g/d). Before and after immobilization, muscle strength and compartmental tissue composition were assessed. A primed continuous infusion of l-[ring-13C6]-phenylalanine with serial muscle biopsies was used to determine postabsorptive and postprandial (20 g milk protein) MyoPS and MitoPS, fiber morphology, markers of protein turnover, and mitochondrial function between the control leg (CTL) and the immobilized leg (IMB). RESULTS Leg fat-free mass was reduced in IMB (mean ± SEM: -3.6% ± 0.5%; P = 0.030) but not CTL with no difference between supplementation groups. Isometric knee extensor strength declined to a greater extent in IMB (-27.9% ± 4.4%) than in CTL (-14.3% ± 4.4%; P = 0.043) with no difference between groups. In response to 20 g milk protein, postprandial MyoPS rates were significantly lower in IMB than in CTL (-22% ± 4%; P < 0.01) in both LEU and PLA. Postabsorptive MyoPS rates did not differ between legs or groups. Postabsorptive MitoPS rates were significantly lower in IMB than in CTL (-14% ± 5%; P < 0.01) and postprandial MitoPS rates significantly declined in response to 20 g milk protein ingestion (CTL: -10% ± 8%; IMB: -15% ± 10%; P = 0.039), with no differences between legs or groups. There were no significant differences in measures of mitochondrial respiration between legs, but peroxisome proliferator-activated receptor γ coactivator 1-α and oxidative phosphorylation complex II and III were significantly lower in IMB than in CTL (P < 0.05), with no differences between groups. CONCLUSIONS High-dose leucine supplementation (15 g/d) does not appear to attenuate any functional declines associated with 7 d of limb immobilization in young, healthy males.This trial was registered at clinicaltrials.gov as NCT03762278.
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Affiliation(s)
- Sophie J Edwards
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Benoit Smeuninx
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - James Mckendry
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom.,Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
| | - Yusuke Nishimura
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Dan Luo
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Ryan N Marshall
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Molly Perkins
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom.,School of Sport and Health Sciences, University of Exeter, Exeter, United Kingdom
| | - Jill Ramsay
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Sophie Joanisse
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom.,Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
| | - Andrew Philp
- Garvan Institute of Medical Research, Sydney, New South Wales, Australia.,St Vincents Medical School, UNSW Medicine, UNSW Sydney, Sydney, New South Wales, Australia
| | - Leigh Breen
- School of Sport, Exercise, and Rehabilitation Sciences, University of Birmingham, Birmingham, United Kingdom.,Medical Research Council-Arthritis Research UK Centre for Musculoskeletal Ageing Research, University of Birmingham, Birmingham, United Kingdom
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Cruz A, Ferian A, Alves PKN, Silva WJ, Bento MR, Gasch A, Labeit S, Moriscot AS. Skeletal Muscle Anti-Atrophic Effects of Leucine Involve Myostatin Inhibition. DNA Cell Biol 2020; 39:2289-2299. [PMID: 33136436 DOI: 10.1089/dna.2020.5423] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Lack of mechanical load leads to skeletal muscle atrophy, and one major underlying mechanism involves the myostatin pathway that negatively regulates protein synthesis and also activates Atrogin-1/MAFbx and MuRF1 genes. In hindlimb immobilization, leucine was observed to attenuate the upregulation of the referred atrogenes, thereby shortening the impact on fiber cross-sectional area, nonetheless, the possible connection with myostatin is still elusive. This study sought to verify the impact of leucine supplementation on myostatin expression. Male Wistar rats were supplemented with leucine and hindlimb immobilized for 3 and 7 days, after which soleus muscles were removed for morphometric measurements and analyzed for gene and protein expression by real-time PCR and Western blotting, respectively. Muscle wasting was prominent 7 days after immobilization, as expected, leucine feeding mitigated this effect. Atrogin-1/MAFbx gene expression was upregulated only after 3 days of immobilization, and this effect was attenuated by leucine supplementation. Atrogin-1/MAFbx protein levels were elevated after 7 days of immobilization, which leucine supplementation was not able to lessen. On the other hand, myostatin gene expression was upregulated in immobilization for 3 and 7 days, which returned to normal levels after leucine supplementation. Myostatin protein levels followed gene expression at a 3-day time point only. Follistatin gene expression was upregulated during immobilization and accentuated by leucine after 3 days of supplementation. Concerning protein expression, follistatin was not altered neither by immobilization nor in immobilized animals treated with leucine. In conclusion, leucine protects against skeletal muscle mass loss during disuse, and the underlying molecular mechanisms appear to involve myostatin inhibition and Atrogin-1 normalization independently of follistatin signaling.
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Affiliation(s)
- André Cruz
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Andrea Ferian
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Paula K N Alves
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - William Jose Silva
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Mirella Ribeiro Bento
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Alexander Gasch
- Institute for Integrative Pathophysiology, Faculty for Clinical Medicine Mannheim of the University of Heidelberg, Mannheim, Germany
| | - Siegfried Labeit
- Institute for Integrative Pathophysiology, Faculty for Clinical Medicine Mannheim of the University of Heidelberg, Mannheim, Germany
| | - Anselmo Sigari Moriscot
- Department of Anatomy, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
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Di Filippo L, De Lorenzo R, D'Amico M, Sofia V, Roveri L, Mele R, Saibene A, Rovere-Querini P, Conte C. COVID-19 is associated with clinically significant weight loss and risk of malnutrition, independent of hospitalisation: A post-hoc analysis of a prospective cohort study. Clin Nutr 2020; 40:2420-2426. [PMID: 33160700 PMCID: PMC7598735 DOI: 10.1016/j.clnu.2020.10.043] [Citation(s) in RCA: 112] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 10/18/2020] [Accepted: 10/21/2020] [Indexed: 12/18/2022]
Abstract
BACKGROUND & AIMS Coronavirus disease 2019 (COVID-19) may associate with clinical manifestations, ranging from alterations in smell and taste to severe respiratory distress requiring intensive care, that might associate with weight loss and malnutrition. We aimed to assess the incidence of unintentional weight loss and malnutrition in COVID-19 survivors. METHODS In this post-hoc analysis of a prospective observational cohort study, we enrolled all adult (age ≥18 years) patients with a confirmed diagnosis of COVID-19 who had been discharged home from either a medical ward or the Emergency Department of San Raffaele University Hospital, and were re-evaluated after remission at the Outpatient COVID-19 Follow-Up Clinic of the same Institution from April 7, 2020, to May 11, 2020. Demographic, anthropometric, clinical and biochemical parameters upon admission were prospectively collected. At follow-up, anthropometrics, the mini nutritional assessment screening and a visual analogue scale for appetite were assessed. RESULTS A total of 213 patients were included in the analysis (33% females, median age 59.0 [49.5-67.9] years, 70% overweight/obese upon initial assessment, 73% hospitalised). Sixty-one patients (29% of the total, and 31% of hospitalised patients vs. 21% of patients managed at home, p = 0.14) had lost >5% of initial body weight (median weight loss 6.5 [5.0-9.0] kg, or 8.1 [6.1-10.9]%). Patients who lost weight had greater systemic inflammation (C-reactive protein 62.9 [29.0-129.5] vs.48.7 [16.1-96.3] mg/dL; p = 0.02), impaired renal function (23.7% vs. 8.7% of patients; p = 0.003) and longer disease duration (32 [27-41] vs. 24 [21-30] days; p = 0.047) as compared with those who did not lose weight. At multivariate logistic regression analysis, only disease duration independently predicted weight loss (OR 1.05 [1.01-1.10] p = 0.022). CONCLUSIONS COVID-19 might negatively impact body weight and nutritional status. In COVID-19 patients, nutritional evaluation, counselling and treatment should be implemented at initial assessment, throughout the course of disease, and after clinical remission. CLINICALTRIALS. GOV REGISTRATION NCT04318366.
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Affiliation(s)
- Luigi Di Filippo
- School of Medicine, Vita-Salute San Raffaele University, Milan, Italy
| | | | - Marta D'Amico
- School of Medicine, Vita-Salute San Raffaele University, Milan, Italy
| | - Valentina Sofia
- School of Medicine, Vita-Salute San Raffaele University, Milan, Italy
| | - Luisa Roveri
- IRCCS San Raffaele Scientific Institute, Milan, Italy
| | - Roberto Mele
- IRCCS San Raffaele Scientific Institute, Milan, Italy
| | | | - Patrizia Rovere-Querini
- School of Medicine, Vita-Salute San Raffaele University, Milan, Italy; IRCCS San Raffaele Scientific Institute, Milan, Italy
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Kirk B, Iuliano S, Daly RM, Duque G. Effects of protein supplementation on muscle wasting disorders: A brief update of the evidence. Australas J Ageing 2020; 39 Suppl 2:3-10. [PMID: 33095495 DOI: 10.1111/ajag.12853] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 07/30/2020] [Accepted: 08/05/2020] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To examine the effects of protein supplementation on muscle mass, strength and function in individuals at risk of muscle wasting disorders. METHODS A narrative overview of the literature based on a PubMed search. RESULTS Increasing protein intake beyond the recommended dietary intake may prevent or attenuate muscle loss in people at risk of muscle wasting disorders; however, there is inconsistent evidence for any benefits on muscle strength or physical function. This is likely due to the significant heterogeneity and bias regarding baseline demographics, basal protein/energy intakes and protein supplement type, dose, timing and compliance. CONCLUSION Protein supplementation attenuates muscle loss in some populations at increased risk of muscle wasting, but there is no consistent evidence to support benefits on muscle strength or physical function. Further randomised controlled trials are needed that focus on whether there is an optimal type, dose and timing of protein intake, and potential interaction with other nutrients.
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Affiliation(s)
- Ben Kirk
- Department of Medicine-Western Health, Melbourne Medical School, University of Melbourne, St Albans, Melbourne, Vic., Australia.,Australian Institute for Musculoskeletal Science (AIMSS), University of Melbourne and Western Health, St Albans, Melbourne, Vic., Australia
| | - Sandra Iuliano
- Australian Institute for Musculoskeletal Science (AIMSS), University of Melbourne and Western Health, St Albans, Melbourne, Vic., Australia.,Department of Endocrinology, University of Melbourne/Austin Health, Heidelberg, Vic., Australia
| | - Robin M Daly
- Institute for Physical Activity and Nutrition, Deakin University, Geelong, Vic., Australia
| | - Gustavo Duque
- Department of Medicine-Western Health, Melbourne Medical School, University of Melbourne, St Albans, Melbourne, Vic., Australia.,Australian Institute for Musculoskeletal Science (AIMSS), University of Melbourne and Western Health, St Albans, Melbourne, Vic., Australia
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Hashimoto Y, Kaji A, Sakai R, Takahashi F, Kawano R, Hamaguchi M, Fukui M. Effect of Exercise Habit on Skeletal Muscle Mass Varies with Protein Intake in Elderly Patients with Type 2 Diabetes: A Retrospective Cohort Study. Nutrients 2020; 12:nu12103220. [PMID: 33096793 PMCID: PMC7589605 DOI: 10.3390/nu12103220] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 10/14/2020] [Accepted: 10/19/2020] [Indexed: 12/30/2022] Open
Abstract
Exercise has been reported to be effective in maintaining and recovering muscle; however, the effect of exercise combined with adequate or inadequate protein intake on muscle mass is not clear. Therefore, this study investigates the effect of exercise habit on changes in muscle mass, with adequate or inadequate protein intake. This retrospective cohort study included 214 elderly patients with type 2 diabetes. The rate of skeletal muscle mass index (SMI) change (%) was defined as ((SMI at follow-up minus SMI at baseline)/(follow-up years [kg/m2/year] × SMI at baseline [kg/m2])) × 100. Adequate protein intake was defined as protein intake ≥1.2 g/kg ideal body weight/day. During a mean follow-up duration of 18.0 (7.1) months, the rate of SMI change was −1.14 (4.10)% in the whole sample. The rate of SMI change of non-habitual exercisers with inadequate protein intake, habitual exercisers with inadequate protein intake, non-habitual exercisers with adequate protein intake, and habitual exercisers with adequate protein intake was −1.22 (3.71), −2.31 (3.30), −1.88 (4.62), and 0.36 (4.29)%, respectively. Compared with patients with exercise habit and adequate protein intake, the odds ratio for decreasing SMI was 2.50 (0.90–6.90, p = 0.078) in patients with no exercise habit and inadequate protein intake, 3.58 (1.24–10.4, p = 0.019) in those with exercise habit and inadequate protein intake, and 3.03 (1.27–7.22, p = 0.012) in those with no exercise habit and adequate protein intake, after adjusting for covariates. Therefore, exercise habit without adequate protein intake was associated with an increased risk of decreasing SMI compared with exercise habit with adequate protein intake.
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Dietary protein, exercise, ageing and physical inactivity: interactive influences on skeletal muscle proteostasis. Proc Nutr Soc 2020; 80:106-117. [PMID: 33023679 DOI: 10.1017/s0029665120007879] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Dietary protein is a pre-requisite for the maintenance of skeletal muscle mass; stimulating increases in muscle protein synthesis (MPS), via essential amino acids (EAA), and attenuating muscle protein breakdown, via insulin. Muscles are receptive to the anabolic effects of dietary protein, and in particular the EAA leucine, for only a short period (i.e. about 2-3 h) in the rested state. Thereafter, MPS exhibits tachyphylaxis despite continued EAA availability and sustained mechanistic target of rapamycin complex 1 signalling. Other notable characteristics of this 'muscle full' phenomenon include: (i) it cannot be overcome by proximal intake of additional nutrient signals/substrates regulating MPS; meaning a refractory period exists before a next stimulation is possible, (ii) it is refractory to pharmacological/nutraceutical enhancement of muscle blood flow and thus is not induced by muscle hypo-perfusion, (iii) it manifests independently of whether protein intake occurs in a bolus or intermittent feeding pattern, and (iv) it does not appear to be dependent on protein dose per se. Instead, the main factor associated with altering muscle full is physical activity. For instance, when coupled to protein intake, resistance exercise delays the muscle full set-point to permit additional use of available EAA for MPS to promote muscle remodelling/growth. In contrast, ageing is associated with blunted MPS responses to protein/exercise (anabolic resistance), while physical inactivity (e.g. immobilisation) induces a premature muscle full, promoting muscle atrophy. It is crucial that in catabolic scenarios, anabolic strategies are sought to mitigate muscle decline. This review highlights regulatory protein turnover interactions by dietary protein, exercise, ageing and physical inactivity.
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Stokes KA, Jones B, Bennett M, Close GL, Gill N, Hull JH, Kasper AM, Kemp SP, Mellalieu SD, Peirce N, Stewart B, Wall BT, West SW, Cross M. Returning to Play after Prolonged Training Restrictions in Professional Collision Sports. Int J Sports Med 2020; 41:895-911. [PMID: 32483768 PMCID: PMC7799169 DOI: 10.1055/a-1180-3692] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 05/14/2020] [Indexed: 02/06/2023]
Abstract
The COVID-19 pandemic in 2020 has resulted in widespread training disruption in many sports. Some athletes have access to facilities and equipment, while others have limited or no access, severely limiting their training practices. A primary concern is that the maintenance of key physical qualities (e. g. strength, power, high-speed running ability, acceleration, deceleration and change of direction), game-specific contact skills (e. g. tackling) and decision-making ability, are challenged, impacting performance and injury risk on resumption of training and competition. In extended periods of reduced training, without targeted intervention, changes in body composition and function can be profound. However, there are strategies that can dramatically mitigate potential losses, including resistance training to failure with lighter loads, plyometric training, exposure to high-speed running to ensure appropriate hamstring conditioning, and nutritional intervention. Athletes may require psychological support given the challenges associated with isolation and a change in regular training routine. While training restrictions may result in a decrease in some physical and psychological qualities, athletes can return in a positive state following an enforced period of rest and recovery. On return to training, the focus should be on progression of all aspects of training, taking into account the status of individual athletes.
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Affiliation(s)
- Keith A. Stokes
- Department for Health, University of Bath, Bath, United Kingdom of Great
Britain and Northern Ireland
- Medical Services, Rugby Football Union, Twickenham, United Kingdom of Great
Britain and Northern Ireland
| | - Ben Jones
- Carnegie Applied Rugby Research (CARR) Centre, Leeds Beckett University
Carnegie Faculty, Leeds, United Kingdom of Great Britain and Northern
Ireland
- Leeds Rhinos Rugby League Club, Leeds, United Kingdom of Great Britain and
Northern Ireland
- England Performance Unit, Rugby Football League Ltd, Leeds, United Kingdom
of Great Britain and Northern Ireland
- Division of Exercise Science and Sports Medicine, University of Cape Town,
Faculty of Health Sciences, Cape Town, South Africa
| | - Mark Bennett
- Rugby Union of Russia, Moscow, Russian Federation
- Applied Sport Technology Exercise and Medicine Research Centre (A-STEM),
Swansea University College of Engineering, Swansea, United Kingdom of Great Britain
and Northern Ireland
| | - Graeme L. Close
- Research Institute for Sport and Exercise Sciences, Liverpool John Moores
University, Liverpool, United Kingdom of Great Britain and Northern
Irelan
- Professional Rugby Department, Rugby Football Union, Twickenham, United
Kingdom of Great Britain and Northern Ireland
| | - Nicholas Gill
- New Zealand Rugby Union, Wellington, New Zealand
- Te HuatakiWaiora School of Health, University of Waikato, Hamilton, New
Zealand
| | - James H. Hull
- Department of Respiratory Medicine, Royal Brompton Hospital, London, United
Kingdom of Great Britain and Northern Ireland
| | - Andreas M. Kasper
- Professional Rugby Department, Rugby Football Union, Twickenham, United
Kingdom of Great Britain and Northern Ireland
| | - Simon P.T. Kemp
- Medical Services, Rugby Football Union, Twickenham, United Kingdom of Great
Britain and Northern Ireland
| | - Stephen D. Mellalieu
- Cardiff School of Sport and Health Sciences, Cardiff Metropolitan
University, Cardiff, United Kingdom of Great Britain and Northern
Ireland
| | - Nicholas Peirce
- Sport Science & Medicine, England and Wales Cricket Board,
Loughborough, United Kingdom of Great Britain and Northern Ireland
| | - Bob Stewart
- Medical Services, Rugby Football Union, Twickenham, United Kingdom of Great
Britain and Northern Ireland
| | - Benjamin T. Wall
- School of Sport and Health Sciences, University of Exeter, Exeter, United
Kingdom of Great Britain and Northern Ireland
| | - Stephen W. West
- Department for Health, University of Bath, Bath, United Kingdom of Great
Britain and Northern Ireland
| | - Matthew Cross
- Department for Health, University of Bath, Bath, United Kingdom of Great
Britain and Northern Ireland
- Professional Rugby Department, Rugby Football Union, Twickenham, United
Kingdom of Great Britain and Northern Ireland
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