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Hirata K, Ito M, Nomura Y, Kawashima C, Yoshida T, Yamada Y, Tillin NA, Power GA, Akagi R. Home-based resistance training performed at either fast or slow speeds improves power output in older adults. Exp Gerontol 2024; 190:112430. [PMID: 38608793 DOI: 10.1016/j.exger.2024.112430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 04/07/2024] [Accepted: 04/09/2024] [Indexed: 04/14/2024]
Abstract
PURPOSE We investigated the effect of an unsupervised, body mass- home-based resistance training program in older adults performed at either a fast or slow contractile speed on changes to muscle-power, -volume, -architecture, and fatigue resistance of the knee extensors. METHODS Thirty-two male older adults (age 65-88 years) were separated into 1) fast-speed exercise (Fast-group), 2) slow-speed exercise (Slow-group), and 3) no exercise (Control-group) groups. Participants in the exercise groups performed 30-45 repetitions of knee-extension and sit-to-stand exercises 3 times a week for 8 weeks with different exercise speed between the groups. Before and after the intervention period, the following variables were measured: Isotonic power, isometric strength, twitch contractile properties, muscle-activity, -architecture, and -quality, neuromuscular fatigue resistance of the knee extensors, and thigh muscle volume. RESULTS Peak power was increased in both the Fast-group (+24 %, P < 0.01, d = 0.65) and Slow-group (+12 %, P < 0.05, d = 0.33) but not in the Control-group. Training increased pennation angle of the vastus lateralis in both the Fast-group (+8 %, P < 0.01, d = 0.42) and Slow-group (+8 %, P < 0.01, d = 0.42), while only the Fast-group showed increase in pennation angle of the rectus femoris (+12 %, P < 0.01, d = 0.64) and thigh muscle volume (+16 %, P < 0.01, d = 0.52). There was no time × group interaction effect for the other neuromuscular measures. CONCLUSIONS Unsupervised, body mass- and home-based resistance training performed at either fast or slow speeds can improve muscle power in older adults, while fast-speed exercise may be preferable over slow-speed owing to the relatively greater improvement of muscle-power, -volume, -architecture, and better time efficiency.
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Affiliation(s)
- Kosuke Hirata
- Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba-shi, Ibaraki, Japan.
| | - Mari Ito
- Airweave Inc., Nukata-gun, Aichi, Japan; Graduate School of Engineering and Science, Shibaura Institute of Technology, Saitama-shi, Saitama, Japan
| | - Yuta Nomura
- Graduate School of Engineering and Science, Shibaura Institute of Technology, Saitama-shi, Saitama, Japan
| | - Chiho Kawashima
- College of Systems Engineering and Science, Shibaura Institute of Technology, Saitama-shi, Saitama, Japan
| | - Tsukasa Yoshida
- Department of Physical Activity Research, National Institute of Health and Nutrition, National Institutes of Biomedical Innovation, Health and Nutrition, Settsu-shi, Osaka, Japan
| | - Yosuke Yamada
- Department of Physical Activity Research, National Institute of Health and Nutrition, National Institutes of Biomedical Innovation, Health and Nutrition, Settsu-shi, Osaka, Japan
| | - Neale A Tillin
- School of Life and Health Sciences, University of Roehampton, London, UK
| | - Geoffrey A Power
- Department of Human Health and Nutritional Sciences, College of Biological Science, University of Guelph, Guelph, Ontario, Canada
| | - Ryota Akagi
- Graduate School of Engineering and Science, Shibaura Institute of Technology, Saitama-shi, Saitama, Japan; College of Systems Engineering and Science, Shibaura Institute of Technology, Saitama-shi, Saitama, Japan.
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Chye S, Valappil AC, Wright DJ, Frank C, Shearer DA, Tyler CJ, Diss CE, Mian OS, Tillin NA, Bruton AM. The effects of combined action observation and motor imagery on corticospinal excitability and movement outcomes: Two meta-analyses. Neurosci Biobehav Rev 2022; 143:104911. [DOI: 10.1016/j.neubiorev.2022.104911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 09/30/2022] [Accepted: 10/06/2022] [Indexed: 11/08/2022]
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Draicchio F, Behrends V, Tillin NA, Hurren NM, Sylow L, Mackenzie R. Involvement of the extracellular matrix and integrin signalling proteins in skeletal muscle glucose uptake. J Physiol 2022; 600:4393-4408. [PMID: 36054466 PMCID: PMC9826115 DOI: 10.1113/jp283039] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Accepted: 08/03/2022] [Indexed: 01/11/2023] Open
Abstract
Whole-body euglycaemia is partly maintained by two cellular processes that encourage glucose uptake in skeletal muscle, the insulin- and contraction-stimulated pathways, with research suggesting convergence between these two processes. The normal structural integrity of the skeletal muscle requires an intact actin cytoskeleton as well as integrin-associated proteins, and thus those structures are likely fundamental for effective glucose uptake in skeletal muscle. In contrast, excessive extracellular matrix (ECM) remodelling and integrin expression in skeletal muscle may contribute to insulin resistance owing to an increased physical barrier causing reduced nutrient and hormonal flux. This review explores the role of the ECM and the actin cytoskeleton in insulin- and contraction-mediated glucose uptake in skeletal muscle. This is a clinically important area of research given that defects in the structural integrity of the ECM and integrin-associated proteins may contribute to loss of muscle function and decreased glucose uptake in type 2 diabetes.
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Affiliation(s)
- Fulvia Draicchio
- School of Life and Health SciencesWhitelands CollegeUniversity of RoehamptonLondonUK
| | - Volker Behrends
- School of Life and Health SciencesWhitelands CollegeUniversity of RoehamptonLondonUK
| | - Neale A. Tillin
- School of Life and Health SciencesWhitelands CollegeUniversity of RoehamptonLondonUK
| | - Nicholas M. Hurren
- School of Life and Health SciencesWhitelands CollegeUniversity of RoehamptonLondonUK
| | - Lykke Sylow
- Molecular Metabolism in Cancer & Ageing Research GroupDepartment of Biomedical SciencesUniversity of CopenhagenCopenhagenDenmark
| | - Richard Mackenzie
- School of Life and Health SciencesWhitelands CollegeUniversity of RoehamptonLondonUK
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Sibley AR, Strike S, Moudy SC, Tillin NA. The associations between asymmetries in quadriceps strength and gait in individuals with unilateral transtibial amputation. Gait Posture 2021; 90:267-273. [PMID: 34536691 DOI: 10.1016/j.gaitpost.2021.08.027] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 08/24/2021] [Accepted: 08/31/2021] [Indexed: 02/02/2023]
Abstract
BACKGROUND Individuals with unilateral transtibial amputations (ITTAs) are asymmetrical in quadriceps strength. It is unknown if this is associated with gait performance characteristics such as walking speed and limb symmetry. RESEARCH QUESTION Are quadriceps strength asymmetries related to walking speed and/ or gait asymmetries in ITTAs? METHODS Knee-extensor isometric maximum voluntary torque (MVT) and rate of torque development (RTD) were measured in eight ITTAs. Gait data were captured as the ITTAs walked at self-selected habitual and fast speeds. Step length and single support time, peak knee extension moments and their impulse and peak vertical ground reaction force (vGRF) in the braking and propulsive phases of stance were extracted. Bilateral Asymmetry Index (BAI) and, for gait variables only, difference in BAI between walking speeds (ΔBAI) were calculated. Correlation analyses assessed the relationships between MVT and RTD asymmetry and (1) walking speed; (2) gait asymmetries. RESULTS Associations between strength and gait BAIs generally became more apparent at faster walking speeds, and when the difference in BAI between fast and habitual walking speed was considered. BAI RTD was strongly negatively correlated with habitual and fast walking speeds (r=∼0.83). Larger BAI RTD was strongly correlated with propulsive vGRF BAI in fast walking, and larger ΔBAIs in vGRF during both the braking and propulsion phases of gait (r = 0.74-0.92). ITTAs who exhibited greater BAI MVT showed greater ΔBAI in single support time (r = 0.83). SIGNIFICANCE While MVT and RTD BAI appear to be associated with gait asymmetries in ITTAs, the magnitude of the asymmetry in RTD appears to be a more sensitive marker of walking speed. Based on these results, it's possible that strengthening the knee-extensors of the amputated limb to improve both MVT and RTD symmetry may benefit walking speed, and reduce asymmetrical loading in gait.
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Affiliation(s)
- Amy R Sibley
- Department of Life Sciences, Whitelands College, University of Roehampton, Holybourne Avenue, London, SW15 4JD, UK.
| | - Siobhán Strike
- Department of Life Sciences, Whitelands College, University of Roehampton, Holybourne Avenue, London, SW15 4JD, UK.
| | - Sarah C Moudy
- Department of Life Sciences, Whitelands College, University of Roehampton, Holybourne Avenue, London, SW15 4JD, UK.
| | - Neale A Tillin
- Department of Life Sciences, Whitelands College, University of Roehampton, Holybourne Avenue, London, SW15 4JD, UK.
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Gordon RJ, Tyler CJ, Castelli F, Diss CE, Tillin NA. Progressive hyperthermia elicits distinct responses in maximum and rapid torque production. J Sci Med Sport 2021; 24:811-817. [DOI: 10.1016/j.jsams.2021.03.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Revised: 01/18/2021] [Accepted: 03/09/2021] [Indexed: 11/30/2022]
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Moudy SC, Tillin NA, Sibley AR, Strike S. Lead limb loading during a single-step descent in persons with and without a transtibial amputation in the trailing limb. Clin Biomech (Bristol, Avon) 2021; 82:105279. [PMID: 33550002 DOI: 10.1016/j.clinbiomech.2021.105279] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 01/14/2021] [Accepted: 01/19/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND Decreased mechanical work done by the trailing limb when descending a single-step could affect load development and increase injury risk on the leading limb. This study assessed the effect of trailing limb mechanics on the development of lead limb load during a step descent by examining individuals with unilateral transtibial amputations who are known to exhibit reduced work in the prosthetic limb. METHODS Eight amputees and 10 able-bodied controls walked 5 m along the length of a raised platform, descended a single-step of 14 cm height, and continued walking. The intact limb of amputees led during descent. Kinematic and kinetic data were recorded using integrated motion capture and force platform system. Lead limb loading was assessed through vertical ground reaction force, and knee moments and joint reaction forces. Sagittal-plane joint work was calculated for the ankle, knee, and hip in both limbs. FINDINGS No differences were found in lead limb loading despite differences in trail limb mechanics evidenced by amputees performing 58% less total work by the trailing (prosthetic) limb to lower the centre of mass (P = 0.004) and 111% less for propulsion (P < 0.001). Amputees descended the step significantly slower (P = 0.003) and performed significantly greater lead limb ankle work (P = 0.017). After accounting for speed differences, initial loading at the knee was significantly higher in the lead limb of amputees versus controls. INTERPRETATION Increasing lead limb work and reducing forward velocity may be effective compensatory strategies to limit lead limb loading during a step descent, in response to reduced trailing limb work.
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Affiliation(s)
- Sarah C Moudy
- Department of Life Sciences, University of Roehampton, London, UK.
| | - Neale A Tillin
- Department of Life Sciences, University of Roehampton, London, UK
| | - Amy R Sibley
- Department of Life Sciences, University of Roehampton, London, UK
| | - Siobhán Strike
- Department of Life Sciences, University of Roehampton, London, UK
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Tillin NA, Hessel AL, Ang SXT. Rate of torque development scaled to maximum torque available is velocity dependent. J Biomech 2020; 114:110144. [PMID: 33278768 DOI: 10.1016/j.jbiomech.2020.110144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 10/09/2020] [Accepted: 11/12/2020] [Indexed: 10/22/2022]
Abstract
The influence of angular velocity on rate of torque development (RTD) is unknown, despite the inverse, curvilinear torque-velocity relationship for angle- and velocity-specific maximum available torque (Tmax) being well-established. This study investigated the relationship between angular velocity and RTD scaled to Tmax. In 17 participants, tetanic contractions (100-Hz) of the knee extensors were evoked as the knee was passively extended at different iso-velocities between 0° s-1 and 200° s-1. Each condition consisted of evoking 0.25-s contractions without pre-activation (for measuring RTD) commencing as the knee passed 95° of extension, and 1.25-s contractions with pre-activation (for measuring Tmax), commencing 1 s prior to the knee reaching 95°. Torque at 100 ms after torque onset (T100) and peak RTD (RTDpeak) in the contractions without pre-activation were normalised to Tmax. The torque-velocity relationship for T100 was flat in comparison to an inverse, curvilinear relationship for Tmax, resulting in linear increases in normalised T100 and RTDpeak with increased velocity. Results also showed normalised T100 and RTDpeak were likely overestimated due to shortening-induced force depression (FD) which would be greater in contractions with- than without- pre-activation. However, these effects of FD cannot explain the faster normalised RTD with increased velocity, as the relative difference in work done (a proxy for FD) between contractions with and without pre-activation decreased - and thus the overestimation of normalised RTD metrics likely decreased - with increased velocity. In conclusion, RTD scaled to Tmax increases with increased velocity, which appears to be an intrinsic contractile property independent of the effects of force depression.
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Affiliation(s)
- Neale A Tillin
- Department of Life Sciences, Roehampton University, London, UK.
| | | | - Shaun X T Ang
- Department of Life Sciences, Roehampton University, London, UK; National Junior College, Singapore
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Sibley AR, Strike S, Moudy SC, Tillin NA. The effects of long‐term muscle disuse on neuromuscular function in unilateral transtibial amputees. Exp Physiol 2020; 105:408-418. [DOI: 10.1113/ep088087] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2019] [Accepted: 11/04/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Amy R. Sibley
- Department of Life SciencesUniversity of Roehampton London UK
- School of Health and Social CareLondon South Bank University London UK
| | - Siobhán Strike
- Department of Life SciencesUniversity of Roehampton London UK
| | - Sarah C. Moudy
- Department of Life SciencesUniversity of Roehampton London UK
- Department of Family MedicineUniversity of North Texas Health Science Center Fort Worth TX USA
| | - Neale A. Tillin
- Department of Life SciencesUniversity of Roehampton London UK
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Moudy SC, Tillin NA, Sibley AR, Strike S. Mechanisms to Attenuate Load in the Intact Limb of Transtibial Amputees When Performing a Unilateral Drop Landing. J Appl Biomech 2020; 36:4-12. [PMID: 31775122 DOI: 10.1123/jab.2019-0087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 07/22/2019] [Accepted: 09/25/2019] [Indexed: 11/18/2022]
Abstract
Individuals with unilateral transtibial amputations experience greater work demand and loading on the intact limb compared with the prosthetic limb, placing this limb at a greater risk of knee joint degenerative conditions. It is possible that increased loading on the intact side may occur due to strength deficits and joint absorption mechanics. This study investigated the intact limb mechanics utilized to attenuate load, independent of prosthetic limb contributions and requirements for forward progression, which could provide an indication of deficiencies in the intact limb. Amputee and healthy control participants completed 3 unilateral drop landings from a 30-cm drop height. Joint angles at touchdown; range of motion; coupling angles; peak powers; and negative work of the ankle, knee, and hip were extracted together with isometric quadriceps strength measures. No significant differences were found in the load or movement mechanics (P ≥ .31, g ≤ 0.42), despite deficits in isometric maximum (20%) and explosive (25%) strength (P ≤ .13, g ≥ 0.61) in the intact limb. These results demonstrate that, when the influence from the prosthetic limb and task demand are absent, and despite deficits in strength, the intact limb adopts joint mechanics similar to able-bodied controls to attenuate limb loading.
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Affiliation(s)
- Sarah C Moudy
- University of Roehampton
- University of North Texas Health Science Center
| | | | - Amy R Sibley
- University of Roehampton
- London South Bank University
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Barclay RD, Beals JW, Drnevich J, Imai BS, Yau PM, Ulanov AV, Tillin NA, Villegas-Montes M, Paluska SA, Watt PW, De Lisio M, Burd NA, Mackenzie RW. Ingestion of lean meat elevates muscle inositol hexakisphosphate kinase 1 protein content independent of a distinct post-prandial circulating proteome in young adults with obesity. Metabolism 2020; 102:153996. [PMID: 31678069 PMCID: PMC7268923 DOI: 10.1016/j.metabol.2019.153996] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 09/25/2019] [Accepted: 10/06/2019] [Indexed: 01/05/2023]
Abstract
BACKGROUND We have recently shown that a novel signalling kinase, inositol hexakisphosphate kinase 1 (IP6K1), is implicated in whole-body insulin resistance via its inhibitory action on Akt. Insulin and insulin like growth factor 1 (IGF-1) share many intracellular processes with both known to play a key role in glucose and protein metabolism in skeletal muscle. AIMS We aimed to compare IGF/IP6K1/Akt signalling and the plasma proteomic signature in individuals with a range of BMIs after ingestion of lean meat. METHODS Ten lean [Body mass index (BMI) (in kg/m2): 22.7 ± 0.4; Homeostatic model assessment of insulin resistance (HOMAIR): 1.36 ± 0.17], 10 overweight (BMI: 27.1 ± 0.5; HOMAIR: 1.25 ± 0.11), and 10 obese (BMI: 35.9 ± 1.3; HOMAIR: 5.82 ± 0.81) adults received primed continuous L-[ring-13C6]phenylalanine infusions. Blood and muscle biopsy samples were collected at 0 min (post-absorptive), 120 min and 300 min relative to the ingestion of 170 g pork loin (36 g protein and 5 g fat) to examine skeletal muscle protein signalling, plasma proteomic signatures, and whole-body phenylalanine disappearance rates (Rd). RESULTS Phenylalanine Rd was not different in obese compared to lean individuals at all time points and was not responsive to a pork ingestion (basal, P = 0.056; 120 & 300 min, P > 0.05). IP6K1 was elevated in obese individuals at 120 min post-prandial vs basal (P < 0.05). There were no acute differences plasma proteomic profiles between groups in the post-prandial state (P > 0.05). CONCLUSIONS These data demonstrate, for the first time that muscle IP6K1 protein content is elevated after lean meat ingestion in obese adults, suggesting that IP6K1 may be contributing to the dysregulation of nutrient uptake in skeletal muscle. In addition, proteomic analysis showed no differences in proteomic signatures between obese, overweight or lean individuals.
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Affiliation(s)
- Richie D Barclay
- Department of Life Sciences, University of Roehampton, London, UK
| | - Joseph W Beals
- Division of Nutritional Sciences, University of Illinois, Urbana, IL, United States
| | - Jenny Drnevich
- High-Performance Biological Computing, Roy J. Carver Biotechnology Center, University of Illinois, Urbana, IL, United States
| | - Brian S Imai
- Protein Sciences Facility, Roy J. Carver Biotechnology Center, University of Illinois, Urbana, IL, United States
| | - Peter M Yau
- Metabolomics Facility, Roy J. Carver Biotechnology Center, University of Illinois, Urbana, IL, United States
| | - Alexander V Ulanov
- Department of Kinesiology and Community Health, University of Illinois, Urbana, IL, United States
| | - Neale A Tillin
- Department of Life Sciences, University of Roehampton, London, UK
| | | | - Scott A Paluska
- Department of Family Medicine, University of Illinois, Urbana, IL, United States
| | - Peter W Watt
- University of Brighton, Welkin Laboratories, Eastbourne, UK
| | - Michael De Lisio
- School of Human Kinetics, Brain and Mind Institute, Center on Neuromuscular Disease, Regenerative Medicine Program, University of Ottawa, Ottawa, ON, Canada
| | - Nicholas A Burd
- Division of Nutritional Sciences, University of Illinois, Urbana, IL, United States; Department of Kinesiology and Community Health, University of Illinois, Urbana, IL, United States
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Barclay RD, Burd NA, Tyler C, Tillin NA, Mackenzie RW. The Role of the IGF-1 Signaling Cascade in Muscle Protein Synthesis and Anabolic Resistance in Aging Skeletal Muscle. Front Nutr 2019; 6:146. [PMID: 31552262 PMCID: PMC6746962 DOI: 10.3389/fnut.2019.00146] [Citation(s) in RCA: 71] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 08/23/2019] [Indexed: 12/14/2022] Open
Abstract
Sarcopenia is defined as the combined loss of skeletal muscle strength, function, and/or mass with aging. This degenerative loss of muscle mass is associated with poor quality of life and early mortality humans. The loss of muscle mass occurs due to acute changes in daily muscle net protein balance (NPB). It is generally believed a poor NPB occurs due to reduced muscle protein synthetic responses to exercise, dietary amino acid availability, or an insensitivity of insulin to suppress breakdown. Hence, aging muscles appear to be resistant to the anabolic action of exercise and protein (amino acids or hormonal) when compared to their younger counterparts. The mechanisms that underpin anabolic resistance to anabolic stimuli (protein and resistance exercise) are multifactorial and may be partly driven by poor lifestyle choices (increased sedentary time and reduced dietary protein intake) as well as an inherent dysregulated mechanism in old muscles irrespective of the environmental stimuli. The insulin like growth factor 1 (IGF-1), Akt /Protein Kinase B and mechanistic target of rapamycin (mTOR) pathway is the primary driver between mechanical contraction and protein synthesis and may be a site of dysregulation between old and younger people. Therefore, our review aims to describe and summarize the differences seen in older muscle in this pathway in response to resistance exercise (RE) and describe approaches that researchers have sought out to maximize the response in muscle. Furthermore, this review will present the hypothesis that inositol hexakisphosphate kinase 1 (IP6K1) may be implicated in IGF-1 signaling and thus sarcopenia, based on recent evidence that IGF-1 and insulin share some intracellular bound signaling events and that IP6K1 has been implicated in skeletal muscle insulin resistance.
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Affiliation(s)
- Richie D Barclay
- Department of Life Sciences, University of Roehampton, London, United Kingdom
| | - Nicholas A Burd
- Division of Nutritional Sciences, Department of Kinesiology and Community Health, University of Illinois, Urbana, IL, United States
| | - Christopher Tyler
- Department of Life Sciences, University of Roehampton, London, United Kingdom
| | - Neale A Tillin
- Department of Life Sciences, University of Roehampton, London, United Kingdom
| | - Richard W Mackenzie
- Department of Life Sciences, University of Roehampton, London, United Kingdom
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Hines MG, Tillin NA, Luo J, Lee RYW. Passive elastic contribution of hip extensors to joint moments during walking in people with low back pain. Clin Biomech (Bristol, Avon) 2018; 60:134-140. [PMID: 30355537 DOI: 10.1016/j.clinbiomech.2018.10.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 05/21/2018] [Accepted: 10/10/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND It has been found that alterations in passive muscle properties may be associated with low back pain, and these may be responsible for the altered gait parameters often observed in subjects with back pain. The purpose of the present study was to assess total hip and passive hip extensor moments in people with or without low back pain during the hip flexion component of walking. METHODS 52 subjects volunteered for this study (low back pain group, n = 25 (male n = 13, female n = 12), control group, n = 27 (male n = 15, female n = 12)). Passive hip moments were calculated using an adapted force transducer during supine testing. A biomechanical model and predictive equation were used to calculate passive hip moments during walking. Total hip moments were calculated with the use of a 9 camera, 3-D motion-capture system. FINDINGS Independent samples t-tests demonstrated no significant differences between groups for gait parameters or hip or knee angles. Results of the ANOVAs demonstrated significant differences in passive hip flexor moments during the second half of hip flexion (P < 0.05).There were also significant differences in hip power and work done during peaks of power absorption and the second peak of power generation (P < 0.05). INTERPRETATION The present data demonstrates that subjects with low back pain have altered passive hip extensor and total power and work done during walking compared with healthy controls. Biomechanical models should include individual measurements of passive joint moments.
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Affiliation(s)
- Mark G Hines
- London South Bank University, School of Applied Sciences, 103 Borough Road, London SE1 0AA, UK; British College of Osteopathic Medicine, 3 Sumpter Close, London NW3 5HR, UK.
| | - Neale A Tillin
- University of Roehampton, School of Life Sciences, Whiteland's College, Holybourne Avenue, London SW15 4JD, UK
| | - Jin Luo
- London South Bank University, School of Applied Sciences, 103 Borough Road, London SE1 0AA, UK
| | - Raymond Y W Lee
- University of Portsmouth, Faculty of Technology, Winston Churchill Avenue, Portsmouth PO1 2UP, UK
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Massey GJ, Balshaw TG, Maden-Wilkinson TM, Tillin NA, Folland JP. Tendinous Tissue Adaptation to Explosive- vs. Sustained-Contraction Strength Training. Front Physiol 2018; 9:1170. [PMID: 30233387 PMCID: PMC6131493 DOI: 10.3389/fphys.2018.01170] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Accepted: 08/03/2018] [Indexed: 01/06/2023] Open
Abstract
The effect of different strength training regimes, and in particular training utilizing brief explosive contractions, on tendinous tissue properties is poorly understood. This study compared the efficacy of 12 weeks of knee extensor explosive-contraction (ECT; n = 14) vs. sustained-contraction (SCT; n = 15) strength training vs. a non-training control (n = 13) to induce changes in patellar tendon and knee extensor tendon-aponeurosis stiffness and size (patellar tendon, vastus-lateralis aponeurosis, quadriceps femoris muscle) in healthy young men. Training involved 40 isometric knee extension contractions (three times/week): gradually increasing to 75% of maximum voluntary torque (MVT) before holding for 3 s (SCT), or briefly contracting as fast as possible to ∼80% MVT (ECT). Changes in patellar tendon stiffness and Young's modulus, tendon-aponeurosis complex stiffness, as well as quadriceps femoris muscle volume, vastus-lateralis aponeurosis area and patellar tendon cross-sectional area were quantified with ultrasonography, dynamometry, and magnetic resonance imaging. ECT and SCT similarly increased patellar tendon stiffness (20% vs. 16%, both p < 0.05 vs. control) and Young's modulus (22% vs. 16%, both p < 0.05 vs. control). Tendon-aponeurosis complex high-force stiffness increased only after SCT (21%; p < 0.02), while ECT resulted in greater overall elongation of the tendon-aponeurosis complex. Quadriceps muscle volume only increased after sustained-contraction training (8%; p = 0.001), with unclear effects of strength training on aponeurosis area. The changes in patellar tendon cross-sectional area after strength training were not appreciably different to control. Our results suggest brief high force muscle contractions can induce increased free tendon stiffness, though SCT is needed to increase tendon-aponeurosis complex stiffness and muscle hypertrophy.
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Affiliation(s)
- Garry J Massey
- Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis, Loughborough University, Loughborough, United Kingdom.,School of Sport, Exercise, and Health Sciences, Loughborough University, Loughborough, United Kingdom
| | - Thomas G Balshaw
- Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis, Loughborough University, Loughborough, United Kingdom.,School of Sport, Exercise, and Health Sciences, Loughborough University, Loughborough, United Kingdom
| | - Thomas M Maden-Wilkinson
- School of Sport, Exercise, and Health Sciences, Loughborough University, Loughborough, United Kingdom.,Faculty of Health and Wellbeing, Sheffield Hallam University, Sheffield, United Kingdom
| | - Neale A Tillin
- Department of Life Sciences, University of Roehampton, London, United Kingdom
| | - Jonathan P Folland
- Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis, Loughborough University, Loughborough, United Kingdom.,School of Sport, Exercise, and Health Sciences, Loughborough University, Loughborough, United Kingdom
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Tillin NA, Pain MTG, Folland JP. Contraction speed and type influences rapid utilisation of available muscle force: neural and contractile mechanisms. J Exp Biol 2018; 221:jeb.193367. [DOI: 10.1242/jeb.193367] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 10/15/2018] [Indexed: 01/14/2023]
Abstract
This study investigated the influence of contraction speed and type on the human ability to rapidly increase torque and utilise the available maximum voluntary torque (MVT) as well as the neuromuscular mechanisms underpinning any effects. Fifteen young, healthy males completed explosive-voluntary knee-extensions in five conditions: isometric (ISO), and both concentric and eccentric at two constant accelerations of 500°.s−2 (CONSLOW and ECCSLOW) and 2000°.s−2 (CONFAST and ECCFAST). Explosive torque and quadriceps EMG were recorded every 25 ms up to 150 ms from their respective onsets and normalised to the available MVT and EMG at MVT, respectively, specific to that joint angle and velocity. Neural efficacy (explosive Voluntary:Evoked octet torque) was also measured, and torque data were entered into a Hill-type muscle model to estimate muscle performance. Explosive torques normalised to MVT (and normalised muscle forces) were greatest in the concentric, followed by isometric, and eccentric conditions; and in the fast compared with slow speeds within the same contraction type (CONFAST>CONSLOW>ISO, and ECCFAST>ECCSLOW). Normalised explosive-phase EMG and neural efficacy were greatest in concentric, followed by isometric and eccentric conditions, but were similar for fast and slow contractions of the same type. Thus, distinct neuromuscular activation appeared to explain the effect of contraction type but not speed on normalised explosive torque, suggesting the speed effect is an intrinsic contractile property. These results provide novel evidence that the ability to rapidly increase torque/force and utilise the available MVT is influenced by both contraction type and speed, due to neural and contractile mechanisms, respectively.
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Affiliation(s)
- Neale A. Tillin
- Department of Life Sciences, Roehampton University, London, UK
| | - Matthew T. G. Pain
- School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, UK
| | - Jonathan P. Folland
- School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, UK
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15
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Massey GJ, Balshaw TG, Maden-Wilkinson TM, Tillin NA, Folland JP. The influence of patellar tendon and muscle-tendon unit stiffness on quadriceps explosive strength in man. Exp Physiol 2017; 102:448-461. [DOI: 10.1113/ep086190] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Accepted: 02/10/2017] [Indexed: 01/14/2023]
Affiliation(s)
- Garry J. Massey
- Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis; Loughborough University; Leicestershire UK
- School of Sport; Exercise; and Health Sciences; Loughborough University; Leicestershire UK
| | - Thomas G. Balshaw
- Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis; Loughborough University; Leicestershire UK
- School of Sport; Exercise; and Health Sciences; Loughborough University; Leicestershire UK
| | | | - Neale A. Tillin
- Department of Life Sciences; University of Roehampton; London UK
| | - Jonathan P. Folland
- Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis; Loughborough University; Leicestershire UK
- School of Sport; Exercise; and Health Sciences; Loughborough University; Leicestershire UK
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Balshaw TG, Massey GJ, Maden-Wilkinson TM, Tillin NA, Folland JP. Training-specific functional, neural, and hypertrophic adaptations to explosive- vs. sustained-contraction strength training. J Appl Physiol (1985) 2016; 120:1364-73. [PMID: 27055984 DOI: 10.1152/japplphysiol.00091.2016] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Accepted: 04/05/2016] [Indexed: 11/22/2022] Open
Abstract
Training specificity is considered important for strength training, although the functional and underpinning physiological adaptations to different types of training, including brief explosive contractions, are poorly understood. This study compared the effects of 12 wk of explosive-contraction (ECT, n = 13) vs. sustained-contraction (SCT, n = 16) strength training vs. control ( n = 14) on the functional, neural, hypertrophic, and intrinsic contractile characteristics of healthy young men. Training involved 40 isometric knee extension repetitions (3 times/wk): contracting as fast and hard as possible for ∼1 s (ECT) or gradually increasing to 75% of maximum voluntary torque (MVT) before holding for 3 s (SCT). Torque and electromyography during maximum and explosive contractions, torque during evoked octet contractions, and total quadriceps muscle volume (QUADSVOL) were quantified pre and post training. MVT increased more after SCT than ECT [23 vs. 17%; effect size (ES) = 0.69], with similar increases in neural drive, but greater QUADSVOL changes after SCT (8.1 vs. 2.6%; ES = 0.74). ECT improved explosive torque at all time points (17–34%; 0.54 ≤ ES ≤ 0.76) because of increased neural drive (17–28%), whereas only late-phase explosive torque (150 ms, 12%; ES = 1.48) and corresponding neural drive (18%) increased after SCT. Changes in evoked torque indicated slowing of the contractile properties of the muscle-tendon unit after both training interventions. These results showed training-specific functional changes that appeared to be due to distinct neural and hypertrophic adaptations. ECT produced a wider range of functional adaptations than SCT, and given the lesser demands of ECT, this type of training provides a highly efficient means of increasing function.
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Affiliation(s)
- Thomas G. Balshaw
- Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis, Loughborough University, Loughborough, United Kingdom
- School of Sport, Exercise, and Health Sciences, Loughborough University, Loughborough, United Kingdom; and
| | - Garry J. Massey
- Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis, Loughborough University, Loughborough, United Kingdom
- School of Sport, Exercise, and Health Sciences, Loughborough University, Loughborough, United Kingdom; and
| | - Thomas M. Maden-Wilkinson
- School of Sport, Exercise, and Health Sciences, Loughborough University, Loughborough, United Kingdom; and
| | - Neale A. Tillin
- Department of Life Sciences, University of Roehampton, London, United Kingdom
| | - Jonathan P. Folland
- Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis, Loughborough University, Loughborough, United Kingdom
- School of Sport, Exercise, and Health Sciences, Loughborough University, Loughborough, United Kingdom; and
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Balshaw TG, Massey GJ, Maden-Wilkinson TM, Tillin NA, Folland JP. Twelve Weeks Of Explosive Strength Training Increases Both Maximal And Explosive Voluntary Torque Production. Med Sci Sports Exerc 2016. [DOI: 10.1249/01.mss.0000486358.39688.0e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Gordon R, Tillin NA, Hall J, Clifford KA, Tyler CJ. The effect of hyperthermia with localised head and neck cooling on neuromuscular function. Extrem Physiol Med 2015. [PMCID: PMC4580791 DOI: 10.1186/2046-7648-4-s1-a3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Tillin NA, Pain MT, Folland JP. Identification of contraction onset during explosive contractions. Response to Thompson et al. “Consistency of rapid muscle force characteristics: Influence of muscle contraction onset detection methodology” [J Electromyogr Kinesiol 2012;22(6):893–900]. J Electromyogr Kinesiol 2013; 23:991-4. [DOI: 10.1016/j.jelekin.2013.04.015] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Revised: 04/16/2013] [Accepted: 04/29/2013] [Indexed: 10/26/2022] Open
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Tillin NA, Pain MTG, Folland JP. Short-term training for explosive strength causes neural and mechanical adaptations. Exp Physiol 2012. [DOI: 10.1111/j.1469-445x.2012.01065.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tillin NA, Pain MTG, Folland JP. Contraction type influences the human ability to use the available torque capacity of skeletal muscle during explosive efforts. Proc Biol Sci 2012; 279:2106-15. [PMID: 22258636 DOI: 10.1098/rspb.2011.2109] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The influence of contraction type on the human ability to use the torque capacity of skeletal muscle during explosive efforts has not been documented. Fourteen male participants completed explosive voluntary contractions of the knee extensors in four separate conditions: concentric (CON) and eccentric (ECC); and isometric at two knee angles (101°, ISO101 and 155°, ISO155). In each condition, torque was measured at 25 ms intervals up to 150 ms from torque onset, and then normalized to the maximum voluntary torque (MVT) specific to that joint angle and angular velocity. Explosive voluntary torque after 50 ms in each condition was also expressed as a percentage of torque generated after 50 ms during a supramaximal 300 Hz electrically evoked octet in the same condition. Explosive voluntary torque normalized to MVT was more than 60 per cent larger in CON than any other condition after the initial 25 ms. The percentage of evoked torque expressed after 50 ms of the explosive voluntary contractions was also greatest in CON (ANOVA; p < 0.001), suggesting higher concentric volitional activation. This was confirmed by greater agonist electromyography normalized to M(max) (recorded during the explosive voluntary contractions) in CON. These results provide novel evidence that the ability to use the muscle's torque capacity explosively is influenced by contraction type, with concentric contractions being more conducive to explosive performance due to a more effective neural strategy.
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Affiliation(s)
- Neale A Tillin
- School of Sport, Exercise and Health Sciences, Loughborough University, Leicestershire, UK.
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Tillin NA, Pain MT, Folland JP. Short-term unilateral resistance training affects the agonist-antagonist but not the force-agonist activation relationship. Muscle Nerve 2011; 43:375-84. [DOI: 10.1002/mus.21885] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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