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Yang L, Liu D, Jiang S, Li H, Chen L, Wu Y, Essien AE, Opoku M, Naranmandakh S, Liu S, Ru Q, Li Y. SIRT1 signaling pathways in sarcopenia: Novel mechanisms and potential therapeutic targets. Biomed Pharmacother 2024; 177:116917. [PMID: 38908209 DOI: 10.1016/j.biopha.2024.116917] [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: 03/26/2024] [Revised: 05/29/2024] [Accepted: 06/09/2024] [Indexed: 06/24/2024] Open
Abstract
Sarcopenia is an aging-related skeletal disease characterized by decreased muscle mass, strength, and physical function, severely affecting the quality of life (QoL) of the elderly population. Sirtuin 1 (SIRT1), as a nicotinamide adenine dinucleotide (NAD+)-dependent histone deacetylases, has been reported to participate in various aging-related signaling pathways and exert protective effect on many human diseases. SIRT1 functioned as an important role in the occurrence and progression of sarcopenia through regulating key pathways related to protein homeostasis, apoptosis, mitochondrial dysfunction, insulin resistance and autophagy in skeletal muscle, including SIRT1/Forkhead Box O (FoxO), AMP-activated protein kinase (AMPK)/SIRT1/nuclear factor κB (NF-κB), SIRT1/p53, AMPK/SIRT1/peroxisome proliferator-activated receptor gamma coactivator-1α (PGC-1α), and SIRT1/live kinase B1 (LKB1)/AMPK pathways. However, the specific mechanisms of these processes have not been fully illuminated. Currently, several SIRT1-mediated interventions on sarcopenia have been preliminarily developed, such as SIRT1 activator polyphenolic compounds, exercising and calorie restriction. In this review, we summarized the predominant mechanisms of SIRT1 involved in sarcopenia and therapeutic modalities targeting the SIRT1 signaling pathways for the prevention and prognosis of sarcopenia.
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Affiliation(s)
- Luning Yang
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China; Xiangya School of Medicine, Central South University, Changsha, Hunan 410013, China
| | - Di Liu
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Shide Jiang
- Department of Orthopedics, The Central Hospital of Yongzhou, Yongzhou 425000, China
| | - Hengzhen Li
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Lin Chen
- Department of Health and Physical Education, Jianghan University, Wuhan 430056, China
| | - Yuxiang Wu
- Department of Health and Physical Education, Jianghan University, Wuhan 430056, China
| | - Anko Elijah Essien
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Michael Opoku
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Shinen Naranmandakh
- Department of chemistry, School of Arts and Sciences, National University of Mongolia, Ulaanbaatar 14201, Mongolia
| | - ShuGuang Liu
- Department of Joint Surgery, Honghui Hospital, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
| | - Qin Ru
- Department of Health and Physical Education, Jianghan University, Wuhan 430056, China.
| | - Yusheng Li
- Department of Orthopedics, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China; National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China.
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Hu J, Wang Y, Ji X, Zhang Y, Li K, Huang F. Non-Pharmacological Strategies for Managing Sarcopenia in Chronic Diseases. Clin Interv Aging 2024; 19:827-841. [PMID: 38765795 PMCID: PMC11102744 DOI: 10.2147/cia.s455736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 05/02/2024] [Indexed: 05/22/2024] Open
Abstract
This article focuses on a range of non-pharmacological strategies for managing sarcopenia in chronic diseases, including exercise, dietary supplements, traditional Chinese exercise, intestinal microecology, and rehabilitation therapies for individuals with limited limb movement. By analyzing multiple studies, the article aims to summarize the available evidence to manage sarcopenia in individuals with chronic diseases. The results strongly emphasize the role of resistance training in addressing chronic diseases and secondary sarcopenia. Maintaining the appropriate frequency and intensity of resistance training can help prevent muscle atrophy and effectively reduce inflammation. Although aerobic exercise has limited ability to improve skeletal muscle mass, it does have some positive effects on physical function. Building upon this, the article explores the potential benefits of combined training approaches, highlighting their helpfulness for overall quality of life. Additionally, the article also highlights the importance of dietary supplements in combating muscle atrophy in chronic diseases. It focuses on the importance of protein intake, supplements rich in essential amino acids and omega-3, as well as sufficient vitamin D to prevent muscle atrophy. Combining exercise with dietary supplements appears to be an effective strategy for preventing sarcopenia, although the optimal dosage and type of supplement remain unclear. Furthermore, the article explores the potential benefits of intestinal microecology in sarcopenia. Probiotics, prebiotics, and bacterial products are suggested as new treatment options for sarcopenia. Additionally, emerging therapies such as whole body vibration training, blood flow restriction, and electrical stimulation show promise in treating sarcopenia with limited limb movement. Overall, this article provides valuable insights into non-pharmacological strategies for managing sarcopenia in individuals with chronic diseases. It emphasizes the importance of a holistic and integrated approach that incorporates exercise, nutrition, and multidisciplinary interventions, which have the potential to promote health in the elderly population. Future research should prioritize high-quality randomized controlled trials and utilize wearable devices, smartphone applications, and other advanced surveillance methods to investigate the most effective intervention strategies for sarcopenia associated with different chronic diseases.
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Affiliation(s)
- Jiawen Hu
- Department of Rheumatology and Immunology, First Medical Center of Chinese PLA General Hospital, Beijing, China
- Medical School of Chinese PLA, Beijing, China
| | - Yiwen Wang
- Department of Rheumatology and Immunology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Xiaojian Ji
- Department of Rheumatology and Immunology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Yinan Zhang
- Department of Rheumatology and Immunology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Kunpeng Li
- Department of Rheumatology and Immunology, First Medical Center of Chinese PLA General Hospital, Beijing, China
| | - Feng Huang
- Department of Rheumatology and Immunology, First Medical Center of Chinese PLA General Hospital, Beijing, China
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Kjeldsen T, Skou ST, Dalgas U, Tønning LU, Ingwersen KG, Birch S, Holm PM, Frydendal T, Garval M, Varnum C, Bibby BM, Mechlenburg I. Progressive Resistance Training or Neuromuscular Exercise for Hip Osteoarthritis : A Multicenter Cluster Randomized Controlled Trial. Ann Intern Med 2024; 177:573-582. [PMID: 38588540 DOI: 10.7326/m23-3225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 04/10/2024] Open
Abstract
BACKGROUND Exercise is recommended as first-line treatment for patients with hip osteoarthritis (OA). However, randomized controlled trials providing evidence for the optimal exercise type are lacking. OBJECTIVE To investigate whether progressive resistance training (PRT) is superior to neuromuscular exercise (NEMEX) for improving functional performance in patients with hip OA. DESIGN Multicenter, cluster-randomized, controlled, parallel-group, assessor-blinded, superiority trial. (ClinicalTrials.gov: NCT04714047). SETTING Hospitals and physiotherapy clinics. PARTICIPANTS 160 participants with clinically diagnosed hip OA were enrolled from 18 January 2021 to 28 April 2023 and randomly assigned to PRT (n = 82) or NEMEX (n = 78). INTERVENTION Twelve weeks of PRT or NEMEX with 2 supervised 60-minute group sessions each week. The PRT intervention consisted of 5 high-intensity resistance training exercises targeting muscles at the hip and knee joints. The NEMEX intervention included 10 exercises and emphasized sensorimotor control and functional stability. MEASUREMENTS The primary outcome was change in the 30-second chair stand test (30s-CST). Key secondary outcomes were changes in scores on the pain and hip-related quality of life (QoL) subscales of the Hip Disability and Osteoarthritis Outcome Score (HOOS). RESULTS The mean changes from baseline to 12-week follow-up in the 30s-CST were 1.5 (95% CI, 0.9 to 2.1) chair stands with PRT and 1.5 (CI, 0.9 to 2.1) chair stands with NEMEX (difference, 0.0 [CI, -0.8 to 0.8] chair stands). For the HOOS pain subscale, mean changes were 8.6 (CI, 5.3 to 11.8) points with PRT and 9.3 (CI, 5.9 to 12.6) points with NEMEX (difference, -0.7 [CI, -5.3 to 4.0] points). For the HOOS QoL subscale, mean changes were 8.0 (CI, 4.3 to 11.7) points with PRT and 5.7 (CI, 1.9 to 9.5) points with NEMEX (difference, 2.3 [CI, -3.0 to 7.6] points). LIMITATION Participants and physiotherapists were not blinded. CONCLUSION In patients with hip OA, PRT is not superior to NEMEX for improving functional performance, hip pain, or hip-related QoL. PRIMARY FUNDING SOURCE Independent Research Fund Denmark.
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Affiliation(s)
- Troels Kjeldsen
- Department of Orthopedic Surgery, Aarhus University Hospital, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark; and Research and Implementation Unit PROgrez, Department of Physiotherapy and Occupational Therapy, Næstved-Slagelse-Ringsted Hospitals, Slagelse, Denmark (T.K.)
| | - Søren T Skou
- The Research and Implementation Unit PROgrez, Department of Physiotherapy and Occupational Therapy, Næstved-Slagelse-Ringsted Hospitals, Slagelse, Denmark, and Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark (S.T.S.)
| | - Ulrik Dalgas
- Exercise Biology, Department of Public Health, Aarhus University, Aarhus, Denmark (U.D.)
| | - Lisa U Tønning
- Department of Orthopedic Surgery, Aarhus University Hospital, and Department of Clinical Medicine, Aarhus University, Aarhus, Denmark (L.U.T.)
| | - Kim G Ingwersen
- Department of Physio- and Occupational Therapy, Lillebaelt Hospital - Vejle, University Hospital of Southern Denmark, and Department of Regional Health Research, Faculty of Health Science, University of Southern Denmark, Odense, Denmark (K.G.I.)
| | - Sara Birch
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark; Department of Neurology, Physiotherapy and Occupational Therapy, Gødstrup Regional Hospital, Herning, Denmark; and Department of Orthopedic Surgery, Gødstrup Regional Hospital, Herning, Denmark (S.B.)
| | - Pætur M Holm
- The Research and Implementation Unit PROgrez, Department of Physiotherapy and Occupational Therapy, Næstved-Slagelse-Ringsted Hospitals, Slagelse, Denmark; Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark; and Faculty of Health Sciences, University of Faroe Islands, Tórshavn, Faroe Islands (P.M.H.)
| | - Thomas Frydendal
- Department of Orthopedic Surgery, Aarhus University Hospital, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark; Department of Physio- and Occupational Therapy, Lillebaelt Hospital - Vejle, University Hospital of Southern Denmark, Odense, Denmark; and Department of Clinical Research, University of Southern Denmark, Odense, Denmark (T.F.)
| | - Mette Garval
- Elective Surgery Centre, Regional Hospital Silkeborg, Silkeborg, Denmark (M.G.)
| | - Claus Varnum
- Department of Regional Health Research, Faculty of Health Science, University of Southern Denmark, Odense, Denmark, and Department of Orthopedic Surgery, Lillebaelt Hospital - Vejle, University Hospital of Southern Denmark, Odense, Denmark (C.V.)
| | - Bo M Bibby
- Department of Biostatistics, Institute of Public Health, Aarhus University, Aarhus, Denmark (B.M.B.)
| | - Inger Mechlenburg
- Department of Orthopedic Surgery, Aarhus University Hospital, Aarhus, Denmark; Department of Clinical Medicine, Aarhus University, Aarhus, Denmark; and Exercise Biology, Department of Public Health, Aarhus University, Aarhus, Denmark (I.M.)
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Sahin K, Orhan C, Ozdemir O, Tuzcu M, Sahin N, Ojalvo SP, Komorowski JR. Effects of Whey Protein Combined with Amylopectin/Chromium on the Muscle Protein Synthesis and mTOR Phosphorylation in Exercised Rats. Biol Trace Elem Res 2024; 202:1031-1040. [PMID: 37341874 DOI: 10.1007/s12011-023-03732-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 06/13/2023] [Indexed: 06/22/2023]
Abstract
This study aimed to examine the impact of varying doses of whey protein (WP) and amylopectin/chromium complex (ACr) supplementation on muscle protein synthesis (MPS), amino acid and insulin levels, and the rapamycin (mTOR) signaling pathways in exercised rats. A total of 72 rats were randomly divided into nine groups: (1) Exercise (Ex), (2) Ex + WPI to (5) Ex + WPIV with various oral doses of whey protein (0.465, 1.55, 2.33, and 3.1 g/kg) and (6) Ex + WPI + ACr to (9) Ex + WPIV + ACr with various doses of whey protein combined with 0.155 g/kg ACr. On the day of single-dose administration, the products were given by oral gavage after exercise. To measure the protein fractional synthesis rate (FSR), a bolus dose of deuterium-labeled phenylalanine was given, and its effects were evaluated 1 h after supplementation. Rats that received 3.1 g/kg of whey protein (WP) combined with ACr exhibited the most significant increase in muscle protein synthesis (MPS) compared to the Ex group (115.7%, p < 0.0001). In comparison to rats that received the same dose of WP alone, those given the combination of WP and ACr at the same dosage showed a 14.3% increase in MPS (p < 0.0001). Furthermore, the WP (3.1 g/kg) + ACr group exhibited the highest elevation in serum insulin levels when compared to the Ex group (111.9%, p < 0.0001). Among the different groups, the WP (2.33 g/kg) + ACr group demonstrated the greatest increase in mTOR levels (224.2%, p < 0.0001). Additionally, the combination of WP (2.33 g/kg) and ACr resulted in a 169.8% increase in 4E-BP1 levels (p < 0.0001), while S6K1 levels rose by 141.2% in the WP (2.33 g/kg) + ACr group (p < 0.0001). Overall, supplementation with various doses of WP combined with ACr increased MPS and enhanced the mTOR signaling pathway compared to WP alone and the Ex group.
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Affiliation(s)
- Kazim Sahin
- Department of Animal Nutrition, Faculty of Veterinary Medicine, Firat University, Elazig, 23119, Turkey.
| | - Cemal Orhan
- Department of Animal Nutrition, Faculty of Veterinary Medicine, Firat University, Elazig, 23119, Turkey
| | - Oguzhan Ozdemir
- Technical Sciences, Vocational School, Department of Veterinary Science, Batman University, Batman, 72000, Turkey
| | - Mehmet Tuzcu
- Department of Biology, Faculty of Science, Firat University, Elazig, 23119, Turkey
| | - Nurhan Sahin
- Department of Animal Nutrition, Faculty of Veterinary Medicine, Firat University, Elazig, 23119, Turkey
| | - Sara Perez Ojalvo
- Research and Development Department, Nutrition 21 LLC, Purchase, NY, 10577, USA
| | - James R Komorowski
- Research and Development Department, Nutrition 21 LLC, Purchase, NY, 10577, USA
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McColl TJ, Clarke DC. Kinetic modeling of leucine-mediated signaling and protein metabolism in human skeletal muscle. iScience 2024; 27:108634. [PMID: 38188514 PMCID: PMC10767222 DOI: 10.1016/j.isci.2023.108634] [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: 06/12/2023] [Revised: 11/15/2023] [Accepted: 12/01/2023] [Indexed: 01/09/2024] Open
Abstract
Skeletal muscle protein levels are governed by the relative rates of muscle protein synthesis (MPS) and breakdown (MPB). The mechanisms controlling these rates are complex, and their integrated behaviors are challenging to study through experiments alone. The purpose of this study was to develop and analyze a kinetic model of leucine-mediated mTOR signaling and protein metabolism in the skeletal muscle of young adults. Our model amalgamates published cellular-level models of the IRS1-PI3K-Akt-mTORC1 signaling system and of skeletal-muscle leucine kinetics with physiological-level models of leucine digestion and transport and insulin dynamics. The model satisfactorily predicts experimental data from diverse leucine feeding protocols. Model analysis revealed that total levels of p70S6K are a primary determinant of MPS, insulin signaling substantially affects muscle net protein balance via its effects on MPB, and p70S6K-mediated feedback of mTORC1 signaling reduces MPS in a dose-dependent manner.
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Affiliation(s)
- Taylor J. McColl
- Department of Biomedical Physiology and KinesiologySimon Fraser University, Burnaby, BC V5A 1S6, Canada
- Centre for Cell Biology, Development and Disease, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
| | - David C. Clarke
- Department of Biomedical Physiology and KinesiologySimon Fraser University, Burnaby, BC V5A 1S6, Canada
- Centre for Cell Biology, Development and Disease, Simon Fraser University, Burnaby, BC V5A 1S6, Canada
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Mao J, Wang T, Wang Y, Kuan G. Effect of resistance training programs differing in set structure on muscular hypertrophy and performance in untrained young men. Front Physiol 2023; 14:1301535. [PMID: 38148897 PMCID: PMC10749963 DOI: 10.3389/fphys.2023.1301535] [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: 09/25/2023] [Accepted: 11/28/2023] [Indexed: 12/28/2023] Open
Abstract
Purpose: This study aimed to compare the effects on muscle hypertrophy and muscular performance of two resistance training (RT) programs that differed only in set structure: traditional set structure (TS) vs. rest redistribution set structure (RR). Methods: Thirty untrained young men were pair-matched and randomly assigned to a TS (n = 15) or an RR (n = 15) protocol based on individual baseline measures. Participants trained for 8 weeks using the same total body RT routines performed twice weekly. The TS protocol comprised four sets of 10 repetitions per exercise with 120-s interset rest, and the RR involved eight sets of five repetitions per exercise with 51-s interset rest. Participants were tested pre- and post-intervention for body composition, regional muscle thickness, upper- and lower-body muscle maximal strength [1-repetition maximum (1RM)], mean power output and velocity at 75% 1RM and muscular endurance (repetitions to failure at 70% 1RM). Results: Compared to baseline, both groups exhibited equally significantly decreased body fat mass (p < 0.05), increased fat-free mass (p < 0.001), muscle thickness (p < 0.05), upper and lower-body muscular maximal strength (p < 0.001) and endurance performance (p < 0.001). However, both groups only increase the lower-body power output (p < 0.001) but not the upper-body (p > 0.05). No significant differences existed between groups for all measurements (p > 0.05). Conclusion: These results suggest that RR and TS groups have similar effects for improving muscle hypertrophy and performance in untrained young men.
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Affiliation(s)
- Jun Mao
- College of Kinesiology and Health, Capital University of Physical Education and Sports, Beijing, China
| | - Tianjiao Wang
- College of Kinesiology and Health, Capital University of Physical Education and Sports, Beijing, China
| | - Yidan Wang
- Faculty of Sports and Exercise Science, Universiti Malaya, Kuala Lumpur, Malaysia
| | - Garry Kuan
- Exercise and Sports Science Programme, School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian, Kelantan, Malaysia
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Xhuti D, Nilsson MI, Manta K, Tarnopolsky MA, Nederveen JP. Circulating exosome-like vesicle and skeletal muscle microRNAs are altered with age and resistance training. J Physiol 2023; 601:5051-5073. [PMID: 36722691 DOI: 10.1113/jp282663] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Accepted: 01/25/2023] [Indexed: 02/02/2023] Open
Abstract
The age-related loss of skeletal muscle mass and functionality, known as sarcopenia, is a critical risk factor for morbidity and all-cause mortality. Resistance exercise training (RET) is the primary countermeasure to fight sarcopenia and ageing. Altered intercellular communication is a hallmark of ageing, which is not well elucidated. Circulating extracellular vesicles (EVs), including exosomes, contribute to intercellular communication by delivering microRNAs (miRNAs), which modulate post-translational modifications, and have been shown to be released following exercise. There is little evidence regarding how EVs or EV-miRNAs are altered with age or RET. Therefore, we sought to characterize circulating EVs in young and older individuals, prior to and following a 12-week resistance exercise programme. Plasma EVs were isolated using size exclusion chromatography and ultracentrifugation. We found that ageing reduced circulating expression markers of CD9, and CD81. Using late-passage human myotubes as a model for ageing in vitro, we show significantly lower secreted exosome-like vesicles (ELVs). Further, levels of circulating ELV-miRNAs associated with muscle health were lower in older individuals at baseline but increased following RET to levels comparable to young. Muscle biopsies show similar age-related reductions in miRNA expressions, with largely no effect of training. This is reflected in vitro, where aged myotubes show significantly reduced expression of endogenous and secreted muscle-specific miRNAs (myomiRs). Lastly, proteins associated with ELV and miRNA biogenesis were significantly higher in both older skeletal muscle tissues and aged human myotubes. Together we show that ageing significantly affects ELV and miRNA cargo biogenesis, and release. RET can partially normalize this altered intercellular communication. KEY POINTS: We show that ageing reduces circulating expression of exosome-like vesicle (ELV) markers, CD9 and CD81. Using late-passage human skeletal myotubes as a model of ageing, we show that secreted ELV markers are significantly reduced in vitro. We find circulating ELV miRNAs associated with skeletal muscle health are lower in older individuals but can increase following resistance exercise training (RET). In skeletal muscle, we find altered expression of miRNAs in older individuals, with no effect of RET. Late-passage myotubes also appear to have aberrant production of endogenous myomiRs with lower abundance than youthful counterparts In older skeletal muscle and late-passage myotubes, proteins involved with ELV- and miRNA biogenesis are upregulated.
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Affiliation(s)
- Donald Xhuti
- Department of Pediatrics, McMaster University Health Sciences Centre, Hamilton, Ontario, Canada
| | - Mats I Nilsson
- Exerkine Corporation, McMaster University Medical Centre (MUMC), Hamilton, Ontario, Canada
| | - Katherine Manta
- Department of Pediatrics, McMaster University Health Sciences Centre, Hamilton, Ontario, Canada
| | - Mark A Tarnopolsky
- Department of Pediatrics, McMaster University Health Sciences Centre, Hamilton, Ontario, Canada
- Exerkine Corporation, McMaster University Medical Centre (MUMC), Hamilton, Ontario, Canada
| | - Joshua P Nederveen
- Department of Pediatrics, McMaster University Health Sciences Centre, Hamilton, Ontario, Canada
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Janssen TAH, Van Every DW, Phillips SM. The impact and utility of very low-calorie diets: the role of exercise and protein in preserving skeletal muscle mass. Curr Opin Clin Nutr Metab Care 2023; 26:521-527. [PMID: 37724991 PMCID: PMC10552824 DOI: 10.1097/mco.0000000000000980] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
PURPOSE OF REVIEW Very low-calorie diets (VLCD) are used as a weight loss intervention, but concerns have been raised about their potential negative impact on lean mass. Here, we review the available evidence regarding the effects of VLCD on lean mass and explore their utility and strategies to mitigate reductions in skeletal muscle. RECENT FINDINGS We observed that VLCD, despite their effects on lean mass, may be suitable in certain populations but have a risk in reducing lean mass. The extent of the reduction in lean mass may depend on various factors, such as the duration and degree of energy deficit of the diet, as well as the individual's starting weight and overall health. SUMMARY VLCD may be a viable option in certain populations; however, priority needs to be given to resistance exercise training, and secondarily to adequate protein intake should be part of this dietary regime to mitigate losing muscle mass.
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Isenmann E, Kaluza D, Havers T, Elbeshausen A, Geisler S, Hofmann K, Flenker U, Diel P, Gavanda S. Resistance training alters body composition in middle-aged women depending on menopause - A 20-week control trial. BMC Womens Health 2023; 23:526. [PMID: 37803287 PMCID: PMC10559623 DOI: 10.1186/s12905-023-02671-y] [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: 04/21/2023] [Accepted: 09/21/2023] [Indexed: 10/08/2023] Open
Abstract
BACKGROUND Resistance training (RT) is effective in counteracting the age- and menopause-related loss of muscle mass (MM) and strength in middle-aged women (40-60 years). Research on RT with free weights is limited in pre- and post-menopausal women. Based on this, a 20-week training intervention was conducted with this population to investigate the effects of systematic RT with free weights on strength capacity and body composition. METHOD Forty-one healthy women (52.0 ± 3.6 years) participated in this study. After 10-week control phase (no RT, T0-T1) followed by a 10-week intervention phase (T1-T2) with RT twice a week and 6-8 sets of each muscle per week. Subjects were randomly assigned to a low-intensity (50% 1-RM) or moderate-intensity (75% 1-RM) RT group and divided into pre-menopausal and post-menopausal according to their hormone profile. Fat-free mass (FFM), MM, fat mass (FM), muscle thickness (Vastus lateralis (VL), Rectus femoris (RF), Triceps brachii (TB)), grip strength, 1-RM squat and bench press were assessed before and after each phase. Statistical analysis was performed using a linear mixed model to account for fixed (time and group) and random (individual) effects. RESULTS A total of 31 women successfully completed the study. No injuries occurred during the intervention. Significant increases in 1-RM squat and bench press were observed in all groups. No interaction effect was observed for the strength parameters. In pre-menopausal women, FFM, MM and RF muscle thickness increased significantly, while VL showed a trend. These effects were not present in post-menopausal women regardless of RT intensity. CONCLUSION RT with free weight is safe and effective for middle-aged women to increase 1-RM. Hypertrophy effects were found exclusively in pre-menopausal women. To achieve hypertrophy and/or body composition changes in post-menopausal women, larger training volumes (> 6-8 sets/muscle per week) are likely required.
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Affiliation(s)
- Eduard Isenmann
- Department of Fitness and Health, IST University of Applied Sciences, Düsseldorf, Germany.
- Institute for Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany.
| | - Dominik Kaluza
- Department of Fitness and Health, IST University of Applied Sciences, Düsseldorf, Germany
| | - Tim Havers
- Department of Fitness and Health, IST University of Applied Sciences, Düsseldorf, Germany
| | - Ana Elbeshausen
- Department of Fitness and Health, IST University of Applied Sciences, Düsseldorf, Germany
| | - Stephan Geisler
- Department of Fitness and Health, IST University of Applied Sciences, Düsseldorf, Germany
| | - Katharina Hofmann
- Institute for Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - Ulrich Flenker
- Institute for Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - Patrick Diel
- Institute for Cardiovascular Research and Sports Medicine, German Sport University Cologne, Cologne, Germany
| | - Simon Gavanda
- Department of Fitness and Health, IST University of Applied Sciences, Düsseldorf, Germany
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Joyner MJ, Wiggins CC, Baker SE, Klassen SA, Senefeld JW. Exercise and Experiments of Nature. Compr Physiol 2023; 13:4879-4907. [PMID: 37358508 PMCID: PMC10853940 DOI: 10.1002/cphy.c220027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2023]
Abstract
In this article, we highlight the contributions of passive experiments that address important exercise-related questions in integrative physiology and medicine. Passive experiments differ from active experiments in that passive experiments involve limited or no active intervention to generate observations and test hypotheses. Experiments of nature and natural experiments are two types of passive experiments. Experiments of nature include research participants with rare genetic or acquired conditions that facilitate exploration of specific physiological mechanisms. In this way, experiments of nature are parallel to classical "knockout" animal models among human research participants. Natural experiments are gleaned from data sets that allow population-based questions to be addressed. An advantage of both types of passive experiments is that more extreme and/or prolonged exposures to physiological and behavioral stimuli are possible in humans. In this article, we discuss a number of key passive experiments that have generated foundational medical knowledge or mechanistic physiological insights related to exercise. Both natural experiments and experiments of nature will be essential to generate and test hypotheses about the limits of human adaptability to stressors like exercise. © 2023 American Physiological Society. Compr Physiol 13:4879-4907, 2023.
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Affiliation(s)
- Michael J Joyner
- Department of Anesthesiology & Perioperative Medicine, Mayo Clinic, Rochester, Minnesota, USA
- Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, USA
| | - Chad C Wiggins
- Department of Anesthesiology & Perioperative Medicine, Mayo Clinic, Rochester, Minnesota, USA
| | - Sarah E Baker
- Department of Anesthesiology & Perioperative Medicine, Mayo Clinic, Rochester, Minnesota, USA
- Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, USA
| | - Stephen A Klassen
- Department of Kinesiology, Brock University, St. Catharines, Ontario, Canada
| | - Jonathon W Senefeld
- Department of Anesthesiology & Perioperative Medicine, Mayo Clinic, Rochester, Minnesota, USA
- Department of Physiology & Biomedical Engineering, Mayo Clinic, Rochester, Minnesota, USA
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11
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Xiang Q, Hu Y, Zheng J, Liu W, Tao J. Research hotspots and trends of exercise for sarcopenia: A bibliometric analysis. Front Public Health 2023; 11:1106458. [PMID: 36969670 PMCID: PMC10031062 DOI: 10.3389/fpubh.2023.1106458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Accepted: 02/17/2023] [Indexed: 03/11/2023] Open
Abstract
Exercise is an effective method for the prevention and treatment of sarcopenia, which can improve skeletal muscle mass, strength and physical function in individuals with sarcopenia to varying degrees. Moreover, exercise has an important role in improving ability to perform daily activities and quality of life on sarcopenia. In this study, articles and review articles on exercise interventions for sarcopenia from January 2003 to July 2022 were retrieved from the Web of Science core collection. Then, the number of annual publications, journal/cited journal, country, institution, author/cited author, references and keywords were analyzed using CiteSpace 6.1.R2. A total of 5,507 publications were collected and the number of publications increasing each year. Experimental Gerontology was the most productive journal and the most cited journal was J GERONTOL A-BIOL. The United States of America was the most influential country with the largest number of publications and centrality. Maastricht University in the Netherlands is the most productive institution. The author VAN LOON LJC has the highest ranking in terms of publications and CRUZ-JENTOFT A is ranked first in terms of cited authors. The most frequently occurring keywords in the field of exercise interventions for sarcopenia are “skeletal muscle,” “exercise,” “body composition,” “strength,” and “older adult”; the keyword “elderly men” showed the strongest explosive intensity. The keywords formed 6 clusters, namely “skeletal muscle,” “muscle strength,” “heart failure,” “muscle protein synthesis,” “insulin resistance” and “high-intensity interval training.” In conclusion, this study demonstrates a new perspective on the current state of research and trends in exercise interventions for sarcopenia over the past 20 years via the visualization software CiteSpace. It may help researchers to identify potential collaborators and partner institutions, hotspots and research frontiers in the field of exercise interventions for sarcopenia.
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Affiliation(s)
- Qing Xiang
- Rehabilitation Technology Innovation Center by Joint Collaboration of Ministry of Education and Fujian Province, Fujian University of Traditional Chinese Medicine, Fuzhou, China
| | - Yue Hu
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, China
| | - Jiaqi Zheng
- College of Rehabilitation Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, China
| | - Weilin Liu
- Rehabilitation Technology Innovation Center by Joint Collaboration of Ministry of Education and Fujian Province, Fujian University of Traditional Chinese Medicine, Fuzhou, China
| | - Jing Tao
- Rehabilitation Technology Innovation Center by Joint Collaboration of Ministry of Education and Fujian Province, Fujian University of Traditional Chinese Medicine, Fuzhou, China
- *Correspondence: Jing Tao
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12
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Hou W, Zhai L, Yang Y, Gu S, Li C, Yang Y, Zhu Y. Is physical activity effective against cancer-related fatigue in lung cancer patients? An umbrella review of systematic reviews and meta-analyses. Support Care Cancer 2023; 31:161. [PMID: 36781549 DOI: 10.1007/s00520-023-07627-4] [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: 07/11/2022] [Accepted: 02/01/2023] [Indexed: 02/15/2023]
Abstract
OBJECTIVES To discuss the effects of physical activity on cancer-related fatigue (CRF) in lung cancer patients, summarize the types of physical activity in the published reviews, assess the quality of the evidence, and provide suggestions for the clinical selection of exercise intervention. METHODS PubMed, EMBASE, Web of Science, and the Cochrane Database of Systematic Reviews were searched through 8 November 2021 to identify relevant systematic reviews and meta-analyses. We also performed a manual search of the reference lists of included articles as supplements. Two researchers independently performed literature screening, data extraction, and quality assessment. The umbrella review has been registered in the International Prospective Register of Systematic Review (PROSPERO) registry (CRD42021292548). RESULTS From the 13 systematic reviews or meta-analyses identified, 10 physical activity interventions were included. The most mentioned intervention was aerobic combined with resistance exercise; however, no reduction of the symptoms of CRF was observed in lung cancer patients by this exercise intervention. Most of the patients who performed aerobic exercises alone showed improvement in CRF after the intervention. In addition, Tai Chi and breathing exercises have been shown to improve fatigue, but more high-quality research is still needed to support its effectiveness. CONCLUSIONS Aerobic exercise, respiratory muscle training, aerobic combined with balance training, and other exercise interventions have been shown to improve CRF in lung cancer patients. But it should be noted that according to the different treatment methods and disease stages of patients, individualized rehabilitation programs should be developed for patients. Due to the low methodological quality and evidence quality of some systematic reviews and meta-analyses included in this study, more high-quality clinical studies and systematic reviews are still needed for validation in the future. This umbrella review helps to identify effective ways of exercise to improve fatigue in lung cancer patients before dedicated evidence-based medical guidelines are established.
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Affiliation(s)
- Weiqian Hou
- The Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, 450000, Henan, China
- Academy of Medical Sciences, Zhengzhou University, Zhengzhou, 450000, Henan, China
| | - Liwen Zhai
- The Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, 450000, Henan, China
- Academy of Medical Sciences, Zhengzhou University, Zhengzhou, 450000, Henan, China
| | - Yujie Yang
- University of Health and Rehabilitation Sciences, Qingdao, 266000, Shandong, China
| | - Shanshan Gu
- Department of Physical Therapy, University of Toronto, Toronto, Ontario, Canada
| | - Conghui Li
- The Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, 450000, Henan, China
- Academy of Medical Sciences, Zhengzhou University, Zhengzhou, 450000, Henan, China
| | - Yao Yang
- The Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, 450000, Henan, China
- Academy of Medical Sciences, Zhengzhou University, Zhengzhou, 450000, Henan, China
| | - Yi Zhu
- The Fifth Affiliated Hospital of Zhengzhou University, Zhengzhou University, Zhengzhou, 450000, Henan, China.
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13
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Allen SL, Elliott BT, Carson BP, Breen L. Improving physiological relevance of cell culture: the possibilities, considerations, and future directions of the ex vivo coculture model. Am J Physiol Cell Physiol 2023; 324:C420-C427. [PMID: 36571441 PMCID: PMC9902212 DOI: 10.1152/ajpcell.00473.2022] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
In vitro models provide an important platform for the investigation of cellular growth and atrophy to inform, or extend mechanistic insights from, logistically challenging in vivo trials. Although these models allow for the identification of candidate mechanistic pathways, many models involve supraphysiological dosages, nonphysiological conditions, or experimental changes relating to individual proteins or receptors, all of which limit translation to human trials. To overcome these drawbacks, the use of ex vivo human plasma and serum has been used in cellular models to investigate changes in myotube hypertrophy, cellular protein synthesis, anabolic and catabolic markers in response to differing age, disease states, and nutrient status. However, there are currently no concurrent guidelines outlining the optimal methodology for this model. This review discusses the key methodological considerations surrounding the use of ex vivo plasma and serum with a focus in application to skeletal muscle cell lines (i.e., C2C12, L6, and LHCN-M2) and human primary skeletal muscle cells (HSMCs) as a means to investigate molecular signaling in models of atrophy and hypertrophy, alongside future directions.
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Affiliation(s)
- Sophie L. Allen
- 1School of Sport Exercise and Rehabilitation Sciences, https://ror.org/03angcq70University of Birmingham, Birmingham, United Kingdom,2NIHR Birmingham Biomedical Research Centre, University Hospitals Birmingham NHS Foundation Trust, University of Birmingham, Birmingham, United Kingdom
| | - Bradley T. Elliott
- 3Translational Physiology Research Group, School of Life Sciences, University of Westminster, London, United Kingdom
| | - Brian P. Carson
- 4Department of Physical Education and Sport Sciences, Faculty of Education and Health Sciences, University of Limerick, Limerick, Ireland,5Health Research Institute, University of Limerick, Limerick, Ireland
| | - Leigh Breen
- 1School of Sport Exercise and Rehabilitation Sciences, https://ror.org/03angcq70University of Birmingham, Birmingham, United Kingdom,2NIHR Birmingham Biomedical Research Centre, University Hospitals Birmingham NHS Foundation Trust, University of Birmingham, Birmingham, United Kingdom,6MRC-Versus Arthritis Centre for Musculoskeletal Aging Research, University of Birmingham, Birmingham, United Kingdom
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14
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Jiao L, Liu Y, Yu XY, Pan X, Zhang Y, Tu J, Song YH, Li Y. Ribosome biogenesis in disease: new players and therapeutic targets. Signal Transduct Target Ther 2023; 8:15. [PMID: 36617563 PMCID: PMC9826790 DOI: 10.1038/s41392-022-01285-4] [Citation(s) in RCA: 49] [Impact Index Per Article: 49.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 12/01/2022] [Accepted: 12/08/2022] [Indexed: 01/10/2023] Open
Abstract
The ribosome is a multi-unit complex that translates mRNA into protein. Ribosome biogenesis is the process that generates ribosomes and plays an essential role in cell proliferation, differentiation, apoptosis, development, and transformation. The mTORC1, Myc, and noncoding RNA signaling pathways are the primary mediators that work jointly with RNA polymerases and ribosome proteins to control ribosome biogenesis and protein synthesis. Activation of mTORC1 is required for normal fetal growth and development and tissue regeneration after birth. Myc is implicated in cancer development by enhancing RNA Pol II activity, leading to uncontrolled cancer cell growth. The deregulation of noncoding RNAs such as microRNAs, long noncoding RNAs, and circular RNAs is involved in developing blood, neurodegenerative diseases, and atherosclerosis. We review the similarities and differences between eukaryotic and bacterial ribosomes and the molecular mechanism of ribosome-targeting antibiotics and bacterial resistance. We also review the most recent findings of ribosome dysfunction in COVID-19 and other conditions and discuss the consequences of ribosome frameshifting, ribosome-stalling, and ribosome-collision. We summarize the role of ribosome biogenesis in the development of various diseases. Furthermore, we review the current clinical trials, prospective vaccines for COVID-19, and therapies targeting ribosome biogenesis in cancer, cardiovascular disease, aging, and neurodegenerative disease.
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Affiliation(s)
- Lijuan Jiao
- grid.263761.70000 0001 0198 0694Institute for Cardiovascular Science and Department of Cardiovascular Surgery, First Affiliated Hospital and Medical College of Soochow University, Collaborative Innovation Center of Hematology, Soochow University, Suzhou, Jiangsu 215123 P. R. China
| | - Yuzhe Liu
- grid.452829.00000000417660726Department of Orthopedics, the Second Hospital of Jilin University, Changchun, Jilin 130000 P. R. China
| | - Xi-Yong Yu
- grid.410737.60000 0000 8653 1072Key Laboratory of Molecular Target & Clinical Pharmacology and the NMPA State Key Laboratory of Respiratory Disease, Guangzhou Medical University, Guangzhou, Guangdong 511436 P. R. China
| | - Xiangbin Pan
- grid.506261.60000 0001 0706 7839Department of Structural Heart Disease, National Center for Cardiovascular Disease, China & Fuwai Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, P. R. China ,Key Laboratory of Cardiovascular Appratus Innovation, Beijing, 100037 P. R. China
| | - Yu Zhang
- grid.263761.70000 0001 0198 0694Institute for Cardiovascular Science and Department of Cardiovascular Surgery, First Affiliated Hospital and Medical College of Soochow University, Collaborative Innovation Center of Hematology, Soochow University, Suzhou, Jiangsu 215123 P. R. China
| | - Junchu Tu
- grid.263761.70000 0001 0198 0694Institute for Cardiovascular Science and Department of Cardiovascular Surgery, First Affiliated Hospital and Medical College of Soochow University, Collaborative Innovation Center of Hematology, Soochow University, Suzhou, Jiangsu 215123 P. R. China
| | - Yao-Hua Song
- Cyrus Tang Hematology Center, Collaborative Innovation Center of Hematology, Soochow University, National Clinical Research Center for Hematologic Diseases, the First Affiliated Hospital of Soochow University, Suzhou, P. R. China. .,State Key Laboratory of Radiation Medicine and Protection, Soochow University, Suzhou, 215123, P. R. China.
| | - Yangxin Li
- Institute for Cardiovascular Science and Department of Cardiovascular Surgery, First Affiliated Hospital and Medical College of Soochow University, Collaborative Innovation Center of Hematology, Soochow University, Suzhou, Jiangsu, 215123, P. R. China.
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15
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Franchi MV, Badiali F, Sarto F, Müller P, Müller NG, Rehfeld K, Monti E, Rankin D, Longo S, Lund J, Hökelmann A, Narici M. Neuromuscular Aging: A Case for the Neuroprotective Effects of Dancing. Gerontology 2023; 69:73-81. [PMID: 35605581 DOI: 10.1159/000524843] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 04/16/2022] [Indexed: 01/06/2023] Open
Abstract
AIM We planned a cross-sectional investigation (study 1) and a longitudinal training intervention (study 2) to investigate whether recreational dancing affords greater neuroprotective effects against age-related neuromuscular junction (NMJ) degeneration compared to general fitness exercise training. METHODS In study 1, we recruited 19 older volunteers regularly practising dancing (older dancers [OD]) and 15 recreationally physically active older individuals (OA) and physical performance, muscle morphology, muscle function, and NMJ stability (from serum C-terminal agrin fragment [CAF] concentration) were assessed. In study 2, employing a longitudinal study design in a different cohort (composed of 37 older adults), we aimed to study whether a 6-month dancing intervention decreased CAF concentration compared to general fitness exercise training in older adults. RESULTS Our findings show that OD had a lower CAF concentration (suggesting an increased NMJ stability) compared to OA. This result was accompanied by superior functional performance despite no differences in muscle size. In study 2, we observed a reduction in CAF concentration only in the dancing group. CONCLUSION Overall, these findings suggest that dancing is an effective training modality to promote neuroprotection and increase muscle function in healthy older individuals.
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Affiliation(s)
- Martino V Franchi
- Department of Biomedical Sciences, University of Padova, Padua, Italy, .,MRC-ARUK Centre for Musculoskeletal Ageing, University of Nottingham, Derby, UK, .,CIR-MYO Myology Center, University of Padova, Padua, Italy,
| | - Francesca Badiali
- MRC-ARUK Centre for Musculoskeletal Ageing, University of Nottingham, Derby, UK
| | - Fabio Sarto
- Department of Biomedical Sciences, University of Padova, Padua, Italy
| | - Patrick Müller
- German Center for Neurodegenrative Disseases (DZNE), Magdeburg, Germany.,Department of Internal Medicine, Division of Cardiology, Angiology and Intensive Medical Care, Otto-von-Guericke University, Magdeburg, Germany
| | - Notger G Müller
- German Center for Neurodegenrative Disseases (DZNE), Magdeburg, Germany.,Department of Neurology, Otto-von-Guericke University, Magdeburg, Germany.,Center for Behavioral Brain Science (CBBS), Magdeburg, Germany
| | - Kathrin Rehfeld
- Institute for Sport Science, Otto-von-Guericke University, Magdeburg, Germany
| | - Elena Monti
- Department of Biomedical Sciences, University of Padova, Padua, Italy.,MRC-ARUK Centre for Musculoskeletal Ageing, University of Nottingham, Derby, UK.,Department of Neurosciences, Imaging and Clinical Science, University of Chieti "G. D'annunzio", Chieti, Italy
| | - Debbie Rankin
- MRC-ARUK Centre for Musculoskeletal Ageing, University of Nottingham, Derby, UK
| | - Stefano Longo
- MRC-ARUK Centre for Musculoskeletal Ageing, University of Nottingham, Derby, UK.,Department of Biomedical Sciences for Health, University of Milan, Milan, Italy
| | - Jon Lund
- MRC-ARUK Centre for Musculoskeletal Ageing, University of Nottingham, Derby, UK
| | - Anita Hökelmann
- Department of Internal Medicine, Division of Cardiology, Angiology and Intensive Medical Care, Otto-von-Guericke University, Magdeburg, Germany
| | - Marco Narici
- Department of Biomedical Sciences, University of Padova, Padua, Italy.,MRC-ARUK Centre for Musculoskeletal Ageing, University of Nottingham, Derby, UK.,CIR-MYO Myology Center, University of Padova, Padua, Italy
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16
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Zhang L, Lang H, Ran L, Tian G, Shen H, Zhu J, Zhang Q, Yi L, Mi M. Long-term high loading intensity of aerobic exercise improves skeletal muscle performance via the gut microbiota-testosterone axis. Front Microbiol 2022; 13:1049469. [PMID: 36620003 PMCID: PMC9811821 DOI: 10.3389/fmicb.2022.1049469] [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: 09/20/2022] [Accepted: 11/28/2022] [Indexed: 12/24/2022] Open
Abstract
Exercise is reported to play a crucial role in skeletal muscle performance. However, the underlying mechanism is still unknown. Thus, we investigated the effect of high-intensity aerobic exercise on skeletal muscle performance. In this study, the male C57BL/6J mice were accepted by high-intensity aerobic exercise for 8 weeks to establish an exercise model. It was observed that high-intensity aerobic exercise markedly affected the expression of genes in skeletal muscle. Moreover, high-intensity aerobic exercise significantly improved skeletal muscle grip strength and serum testosterone levels. HE staining showed that the cross-sectional area (CSA) of the skeletal muscle was successfully increased after 8 weeks of high-intensity aerobic exercise. Additionally, we found that high-intensity aerobic exercise changed gut microbiota structure by altering the abundance of Akkermansia, Allobaculum, and Lactobacillus, which might be related to testosterone production. However, the beneficial effects disappeared after the elimination of the gut microbiota and recovered after fecal microbiota transplantation (FMT) experiments for 1 week. These results indicated that the beneficial effects of high-intensity aerobic exercise on skeletal muscle were partly dependent on the gut microbiota. Our results suggested that long-term high loading intensity of aerobic exercise could improve skeletal muscle performance, which was probably due to the gut microbiota-testosterone axis.
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Affiliation(s)
| | | | | | | | | | | | | | - Long Yi
- *Correspondence: Long Yi, ; Mantian Mi,
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17
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Gaulton N, Wakelin G, Young LV, Wotherspoon S, Kamal M, Parise G, Nederveen JP, Holwerda A, Verdijk LB, van Loon LJC, Snijders T, Johnston AP. Twist2-expressing cells reside in human skeletal muscle and are responsive to aging and resistance exercise training. FASEB J 2022; 36:e22642. [PMID: 36374263 DOI: 10.1096/fj.202201349rr] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 10/21/2022] [Accepted: 10/25/2022] [Indexed: 11/16/2022]
Abstract
Skeletal muscle is maintained and repaired by sub-laminar, Pax7-expressing satellite cells. However, recent mouse investigations have described a second myogenic progenitor population that resides within the myofiber interstitium and expresses the transcription factor Twist2. Twist2-expressing cells exclusively repair and maintain type IIx/b muscle fibers. Currently, it is unknown if Twist2-expressing cells are present in human skeletal muscle and if they function as myogenic progenitors. Here, we perform a combination of single-cell RNA sequencing analysis and immunofluorescence staining to demonstrate the identity and localization of Twist2-expressing cells in human skeletal muscle. Twist2-expressing cells were identified to be anatomically and transcriptionally comparable to fibro-adipogenic progenitors (FAPs) and lack expression of typical satellite cell markers such as Pax7. Comparative analysis revealed that human and mouse Twist2-expressing cells were highly transcriptionally analogous and resided within the same anatomical structures in vivo. Examination of young and aged skeletal muscle biopsy samples revealed that Twist2-positive cells are more prevalent in aged muscle and increase following 12-weeks of resistance exercise training (RET) in humans. However, the quantity of Twist2-positive cells was not correlated with indices of muscle mass or muscle fiber cross-sectional area (CSA) in young or older muscle, and their abundance was surprisingly, negatively correlated with CSA and myonuclear domain size following RET. Taken together, we have identified cells expressing Twist2 in human skeletal muscle which are responsive to aging and exercise. Further examination of their myogenic potential is warranted.
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Affiliation(s)
- Nick Gaulton
- Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Griffen Wakelin
- Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada.,Department of Medical Neuroscience, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Laura V Young
- Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada
| | - Scott Wotherspoon
- Queen Elizabeth Hospital, Charlottetown, Prince Edward Island, Canada
| | - Michael Kamal
- Department of Kinesiology, Faculty of Science, McMaster University, Ontario, Hamilton, Canada
| | - Gianni Parise
- Department of Kinesiology, Faculty of Science, McMaster University, Ontario, Hamilton, Canada
| | - Joshua P Nederveen
- Department of Pediatrics, McMaster University Children's Hospital, Hamilton, Ontario, Canada
| | - Andy Holwerda
- Department of Human Biology, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, The Netherlands
| | - Lex B Verdijk
- Department of Human Biology, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, The Netherlands
| | - Luc J C van Loon
- Department of Human Biology, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, The Netherlands
| | - Tim Snijders
- Department of Human Biology, School of Nutrition and Translational Research in Metabolism (NUTRIM), Maastricht University, Maastricht, The Netherlands
| | - Adam P Johnston
- Department of Applied Human Sciences, University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada.,Department of Medical Neuroscience, Dalhousie University, Halifax, Nova Scotia, Canada
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18
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Kjeldsen T, Dalgas U, Skou ST, van Tulder M, Bibby BM, Mechlenburg I. Progressive resistance training compared to neuromuscular exercise in patients with hip osteoarthritis and the additive effect of exercise booster sessions: protocol for a multicentre cluster randomised controlled trial (The Hip Booster Trial). BMJ Open 2022; 12:e061053. [PMID: 36109033 PMCID: PMC9478855 DOI: 10.1136/bmjopen-2022-061053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
INTRODUCTION The primary aim of this randomised controlled trial is to investigate the effectiveness of 3 months of progressive resistance training (PRT) compared to neuromuscular exercise (NEMEX) on functional performance in patients with hip osteoarthritis (OA). Secondary aims are to investigate the effectiveness of exercise booster sessions (EBS) in prolonging the effects of the initial exercise interventions as well as to investigate the cost-effectiveness of PRT, NEMEX and EBS at 12-month follow-up. METHODS AND ANALYSIS This multicentre cluster randomised controlled trial will be conducted at hospitals and physiotherapy clinics across Denmark. A total of 160 participants with clinically diagnosed hip OA will be recruited. Participants will be cluster randomised to a 3-month intervention of either PRT or NEMEX and to receive EBS or not, resulting in four treatment arms.The primary outcome is change in functional performance, measured by the 30 s chair stand test at 3 months for the primary comparison and at 12 months for the EBS comparisons. Secondary outcomes include changes in 40 m fast-paced walk test, 9-step timed stair climb test, leg extensor muscle power and maximal strength, Hip disability and Osteoarthritis Outcome Score subscales, EuroQol Group 5-dimension, global perceived effect, physical activity and pain. Outcomes are measured at baseline, after the initial 3 months of intervention, and at 6-month, 9-month and 12-month follow-up. An intention-to-treat approach will be used for analysing changes in the primary and secondary outcome measures. ETHICS AND DISSEMINATION The trial has been approved by the Central Denmark Region Committee on Biomedical Research Ethics (Journal No 1-10-72-267-20) and registered at the Danish Data Protection Agency (Journal No 1-16-02-11-21). Results will be published in international peer-reviewed scientific journals. TRIAL REGISTRATION NUMBER NCT04714047.
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Affiliation(s)
- Troels Kjeldsen
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- The Research Unit PROgrez, Department of Physiotherapy and Occupational Therapy, Næstved-Slagelse-Ringsted Hospitals, Slagelse, Denmark
| | - Ulrik Dalgas
- Exercise Biology, Department of Public Health, Aarhus University, Aarhus, Denmark
| | - Søren T Skou
- The Research Unit PROgrez, Department of Physiotherapy and Occupational Therapy, Næstved-Slagelse-Ringsted Hospitals, Slagelse, Denmark
- Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark
| | - Maurits van Tulder
- Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
- Department of Physiotherapy & Occupational Therapy, Aarhus University Hospital, Aarhus, Denmark
| | - Bo M Bibby
- Department of Biostatistics, Institute of Public Health, Aarhus University, Aarhus, Denmark
| | - Inger Mechlenburg
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
- Department of Orthopedic Surgery, Aarhus University Hospital, Aarhus, Denmark
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19
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LIM CHANGHYUN, NUNES EVERSONA, CURRIER BRADS, MCLEOD JONATHANC, THOMAS AARONCQ, PHILLIPS STUARTM. An Evidence-Based Narrative Review of Mechanisms of Resistance Exercise-Induced Human Skeletal Muscle Hypertrophy. Med Sci Sports Exerc 2022; 54:1546-1559. [PMID: 35389932 PMCID: PMC9390238 DOI: 10.1249/mss.0000000000002929] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Skeletal muscle plays a critical role in physical function and metabolic health. Muscle is a highly adaptable tissue that responds to resistance exercise (RE; loading) by hypertrophying, or during muscle disuse, RE mitigates muscle loss. Resistance exercise training (RET)-induced skeletal muscle hypertrophy is a product of external (e.g., RE programming, diet, some supplements) and internal variables (e.g., mechanotransduction, ribosomes, gene expression, satellite cells activity). RE is undeniably the most potent nonpharmacological external variable to stimulate the activation/suppression of internal variables linked to muscular hypertrophy or countering disuse-induced muscle loss. Here, we posit that despite considerable research on the impact of external variables on RET and hypertrophy, internal variables (i.e., inherent skeletal muscle biology) are dominant in regulating the extent of hypertrophy in response to external stimuli. Thus, identifying the key internal skeletal muscle-derived variables that mediate the translation of external RE variables will be pivotal to determining the most effective strategies for skeletal muscle hypertrophy in healthy persons. Such work will aid in enhancing function in clinical populations, slowing functional decline, and promoting physical mobility. We provide up-to-date, evidence-based perspectives of the mechanisms regulating RET-induced skeletal muscle hypertrophy.
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Affiliation(s)
- CHANGHYUN LIM
- Department of Kinesiology, McMaster University, Hamilton, Ontario, CANADA
| | - EVERSON A. NUNES
- Department of Kinesiology, McMaster University, Hamilton, Ontario, CANADA
- Department of Physiological Science, Federal University of Santa Catarina, Florianópolis, Santa-Catarina, BRAZIL
| | - BRAD S. CURRIER
- Department of Kinesiology, McMaster University, Hamilton, Ontario, CANADA
| | - JONATHAN C. MCLEOD
- Department of Kinesiology, McMaster University, Hamilton, Ontario, CANADA
| | - AARON C. Q. THOMAS
- Department of Kinesiology, McMaster University, Hamilton, Ontario, CANADA
| | - STUART M. PHILLIPS
- Department of Kinesiology, McMaster University, Hamilton, Ontario, CANADA
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20
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Yu B, Liu J, Zhang J, Mu T, Feng X, Ma R, Gu Y. Regulatory role of RNA N6-methyladenosine modifications during skeletal muscle development. Front Cell Dev Biol 2022; 10:929183. [PMID: 35990615 PMCID: PMC9389409 DOI: 10.3389/fcell.2022.929183] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 06/28/2022] [Indexed: 01/07/2023] Open
Abstract
Functional cells in embryonic myogenesis and postnatal muscle development undergo multiple stages of proliferation and differentiation, which are strict procedural regulation processes. N6-methyladenosine (m6A) is the most abundant RNA modification that regulates gene expression in specific cell types in eukaryotes and regulates various biological activities, such as RNA processing and metabolism. Recent studies have shown that m6A modification-mediated transcriptional and post-transcriptional regulation plays an essential role in myogenesis. This review outlines embryonic and postnatal myogenic differentiation and summarizes the important roles played by functional cells in each developmental period. Furthermore, the key roles of m6A modifications and their regulators in myogenesis were highlighted, and the synergistic regulation of m6A modifications with myogenic transcription factors was emphasized to characterize the cascade of transcriptional and post-transcriptional regulation during myogenesis. This review also discusses the crosstalk between m6A modifications and non-coding RNAs, proposing a novel mechanism for post-transcriptional regulation during skeletal muscle development. In summary, the transcriptional and post-transcriptional regulatory mechanisms mediated by m6A and their regulators may help develop new strategies to maintain muscle homeostasis, which are expected to become targets for animal muscle-specific trait breeding and treatment of muscle metabolic diseases.
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21
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Bevilacqua G, D’Angelo S, Linaker C, Paul A, Bloom I, Zhang J, Laskou F, Cooper C, Ward KA, Walker-Bone K, Dennison EM. Physical Activity and Diet in a Global Pandemic: An Investigation of the Impact of COVID-19 on Factors Relevant for Musculoskeletal Health at Two Different Stages of the Lifecourse. Front Endocrinol (Lausanne) 2022; 13:882399. [PMID: 35592788 PMCID: PMC9110642 DOI: 10.3389/fendo.2022.882399] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 03/28/2022] [Indexed: 11/13/2022] Open
Abstract
Background Physical activity, nutrition and other lifestyle factors play important roles in maintaining musculoskeletal health. The coronavirus disease (COVID-19) originated in late 2019, spread globally to be declared a pandemic by the World Health Organisation in March 2020, and led to widespread behaviour change. The aim of this study was to use two existing cohorts, the Hertfordshire Cohort Study (HCS) and Health and Employment After Fifty Study (HEAF), to understand how wave one of the COVID-19 pandemic impacted lifestyle factors associated with musculoskeletal health in the UK. Methods 125 eligible participants, 65 males and 60 females (drawn from the HCS study, median (IQR) age 84.3 (82.4-86.6) years, all Caucasian, and community dwelling) were contacted by telephone and asked to complete a questionnaire administered by a trained researcher. Data collection occurred over the period July 2020 to February 2021. 2469 participants, 1086 men and 1383 women (drawn from the HEAF study, median age 65.7 (62.0-69.3) years, mostly Caucasian and community dwelling) completed an online questionnaire in March 2021. Results In HCS, 47% respondents reported being less physically active than before the pandemic (and only 5% more so), 27% said they consumed less alcohol compared to pre-pandemic times (and only 3% more so), and 18% reported eating less than before, although quality of diet was generally unchanged over this timeframe surveyed. In HEAF, 44% participants said they were less active than before the pandemic, while 17% reported being more active. The majority of participants reported no changes in alcohol consumption and diet; however, 19% said they drank more than before (32% of which was above recommended levels), 16% said their diet was less healthy, and 19% reported eating more than before. Conclusion We have reported the experience of the first wave of the COVID-19 pandemic among participants of two Caucasian community dwelling UK cohorts, highlighting the impact of the pandemic on lifestyle factors associated with musculoskeletal health. Changed physical activity levels were reported in a high proportion of respondents in both studies; an investigation of reversibility of these changes is required.
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Affiliation(s)
- Gregorio Bevilacqua
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
- Medical Research Council (MRC) Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton, Southampton, United Kingdom
| | - Stefania D’Angelo
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
- Medical Research Council (MRC) Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton, Southampton, United Kingdom
| | - Cathy Linaker
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
- Medical Research Council (MRC) Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton, Southampton, United Kingdom
| | - Alice Paul
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
| | - Ilse Bloom
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
- National Institute for Health and Care Research (NIHR) Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton National Health Service (NHS) Foundation Trust, Southampton, United Kingdom
| | - Jean Zhang
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
- National Institute for Health and Care Research (NIHR) Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton National Health Service (NHS) Foundation Trust, Southampton, United Kingdom
| | - Faidra Laskou
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
| | - Cyrus Cooper
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
- National Institute for Health and Care Research (NIHR) Southampton Biomedical Research Centre, University of Southampton and University Hospital Southampton National Health Service (NHS) Foundation Trust, Southampton, United Kingdom
- National Institute for Health and Care Research (NIHR) Oxford Biomedical Research Centre, University of Oxford, Oxford, United Kingdom
| | - Kate A. Ward
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
| | - Karen Walker-Bone
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
- Medical Research Council (MRC) Versus Arthritis Centre for Musculoskeletal Health and Work, University of Southampton, Southampton, United Kingdom
| | - Elaine M. Dennison
- Medical Research Council (MRC) Lifecourse Epidemiology Centre, University of Southampton, Southampton General Hospital, Southampton, United Kingdom
- School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand
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22
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Protein Supplement Perceptions, Use, and Associated Performance in Young Lebanese Resistance-Training Athletes. J Nutr Metab 2022; 2022:4150620. [PMID: 35223095 PMCID: PMC8881173 DOI: 10.1155/2022/4150620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Accepted: 01/18/2022] [Indexed: 11/25/2022] Open
Abstract
The aims of this study were first to evaluate the nutritional knowledge, perception, and source of nutrition information among resistance-trained individuals consuming protein supplements (PS), to determine whether a correlation exists between nutrition-related knowledge and the use of PS, and finally to compare the impact of PS use among participants classified as nonprotein supplement users (NPSUs) and protein supplement users (PSUs). A cross-sectional study was conducted among a highly selected group of resistance-specialized trainees (RSTs). Among the 100 RST participants recruited, the Internet and coaches were the most common source of nutritional information. About one-third of participants believed that there were no health risks after consuming PS. Both NPSU and PSU exhibit performance improvement that was significantly lessened in PSU compared to NPSU. This study demonstrated that RST may have misconceptions regarding the benefits of PS usage to increase strength. Our data also suggest a shortage of knowledge about PS and confirm that PSUs lack proper professional guidance. These findings highlight the need for proper monitoring to ensure adequate perception, awareness, and safety in the Lebanese sports sector.
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Zwetsloot KA, Shanely RA, Godwin JS, Hodgman CF. Phytoecdysteroids Accelerate Recovery of Skeletal Muscle Function Following in vivo Eccentric Contraction-Induced Injury in Adult and Old Mice. FRONTIERS IN REHABILITATION SCIENCES 2021; 2:757789. [PMID: 36188800 PMCID: PMC9397830 DOI: 10.3389/fresc.2021.757789] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Accepted: 10/18/2021] [Indexed: 11/25/2022]
Abstract
Background: Eccentric muscle contractions are commonly used in exercise regimens, as well as in rehabilitation as a treatment against muscle atrophy and weakness. If repeated multiple times, eccentric contractions may result in skeletal muscle injury and loss of function. Skeletal muscle possesses the remarkable ability to repair and regenerate after an injury or damage; however, this ability is impaired with aging. Phytoecdysteroids are natural plant steroids that possess medicinal, pharmacological, and biological properties, with no adverse side effects in mammals. Previous research has demonstrated that administration of phytoecdysteroids, such as 20-hydroxyecdysone (20E), leads to an increase in protein synthesis signaling and skeletal muscle strength. Methods: To investigate whether 20E enhances skeletal muscle recovery from eccentric contraction-induced damage, adult (7–8 mo) and old (26–27 mo) mice were subjected to injurious eccentric contractions (EC), followed by 20E or placebo (PLA) supplementation for 7 days. Contractile function via torque-frequency relationships (TF) was measured three times in each mouse: pre- and post-EC, as well as after the 7-day recovery period. Mice were anesthetized with isoflurane and then electrically-stimulated isometric contractions were performed to obtain in vivo muscle function of the anterior crural muscle group before injury (pre), followed by 150 EC, and then again post-injury (post). Following recovery from anesthesia, mice received either 20E (50 mg•kg−1 BW) or PLA by oral gavage. Mice were gavaged daily for 6 days and on day 7, the TF relationship was reassessed (7-day). Results: EC resulted in significant reductions of muscle function post-injury, regardless of age or treatment condition (p < 0.001). 20E supplementation completely recovered muscle function after 7 days in both adult and old mice (pre vs. 7-day; p > 0.05), while PLA muscle function remained reduced (pre vs. 7-day; p < 0.01). In addition, histological markers of muscle damage appear lower in damaged muscle from 20E-treated mice after the 7-day recovery period, compared to PLA. Conclusions: Taken together, these findings demonstrate that 20E fully recovers skeletal muscle function in both adult and old mice just 7 days after eccentric contraction-induced damage. However, the underlying mechanics by which 20E contributes to the accelerated recovery from muscle damage warrant further investigation.
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Affiliation(s)
- Kevin A. Zwetsloot
- Integrative Muscle Physiology Laboratory, Appalachian State University, Boone, NC, United States
- Department of Health and Exercise Science, Appalachian State University, Boone, NC, United States
- Department of Biology, Appalachian State University, Boone, NC, United States
- *Correspondence: Kevin A. Zwetsloot
| | - R. Andrew Shanely
- Integrative Muscle Physiology Laboratory, Appalachian State University, Boone, NC, United States
- Department of Health and Exercise Science, Appalachian State University, Boone, NC, United States
| | - Joshua S. Godwin
- Integrative Muscle Physiology Laboratory, Appalachian State University, Boone, NC, United States
| | - Charles F. Hodgman
- Integrative Muscle Physiology Laboratory, Appalachian State University, Boone, NC, United States
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