Influence of additional load on the moments of the agonist and antagonist muscle groups at the knee joint during closed chain exercise |
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| Authors: | Guillaume Rao David Amarantini Eric Berton |
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| Institution: | 1. Movement and Perception Laboratory, UMR CNRS 6152, CNRS, University of the Mediterranean, Parc Scientifique et Technologique de Luminy, 163, Avenue de Luminy, 13288 Marseille cedex 09, France;2. University of Delaware, Department of Mechanical Engineering, 126 Spencer Laboratory, University of Delaware, Newark, DE, USA;3. Laboratoire Adaptation Perceptivo-Motrice et Apprentissage, UFR APS, Universite Paul Sabatier, Toulouse III, 118, Route de Narbonne, 31062 Toulouse cedex 09, France;1. Département de génie de la production automatisée, École de technologie supérieure (ÉTS), Montréal, Québec, Canada;2. Laboratoire de recherche en imagerie et orthopédie, Centre de recherche, Centre hospitalier de l?Université de Montréal (CRCHUM), Montréal, Québec, Canada;3. Université de Lyon, F-69622 Lyon, France;4. Université Claude Bernard Lyon 1, Villeurbanne, France;5. IFSTTAR, UMR_T9406, Laboratoire de Biomécanique et Mécanique des Chocs, F-69675 Bron, France;1. University of Wisconsin-La Crosse, La Crosse Institute for Movement Science, Department of Health Professions, Physical Therapy Program, La Crosse, WI 54601, USA;2. Cleveland State University, Mechanical Engineering Department, Cleveland, OH, USA;1. The University of Queensland, School of Health & Rehabilitation Sciences, Brisbane, Queensland, 4072, Australia;2. La Trobe Sport and Exercise Medicine Research Centre (LASEM), College of Science, Health and Engineering, School of Allied Health, La Trobe University, Melbourne, Victoria, 3086, Australia;1. Department of Mechanical and Materials Engineering, Queen?s University, McLaughlin Hall, Kingston, Ontario, Canada K7L 3N6;2. Department of Mechanical Engineering, University of Wisconsin-Madison, WI 53706, USA;1. Center for Neuroplasticity and Pain (CNAP), SMI, Department of Health Science and Technology, Faculty of Medicine, Aalborg University, Denmark;2. School of Health Sciences, Faculty of Health and Medicine, University of Newcastle, Australia;3. Department of Physical Therapies, Australian Institute of Sport, Australia;4. Department of Orthopedic Surgery, Kochi University, Japan;5. Department of Sports Medicine, Australian Institute of Sport, Australia;6. UCRISE, University of Canberra, Australia |
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| Abstract: | The present study investigated the influence of additional loads on the knee net joint moment, flexor and extensor muscle group moments, and cocontraction index during a closed chain exercise. Loads of 8, 28, or 48 kg (i.e., respectively, 11.1 ± 1.5%, 38.8 ± 5.3%, and 66.4 ± 9.0% of body mass) were added to subjects during dynamic half squats. The flexor and extensor muscular moments and the amount of cocontraction were estimated at the knee joint using an EMG-and-optimization model that includes kinematics, ground reaction, and EMG measurements as inputs. In general, our results showed a significant influence of the Load factor on the net knee joint moment, the extensor muscular moment, and the flexor muscle group moment (all Anova p < .05). Hence we confirmed an increase in muscle moments with increasing load and moreover, we also showed an original “more than proportional” evolution of the flexor and extensor muscle group moments relative to the knee net joint moment. An influence of the Phase (i.e., descent vs. ascent) factor was also seen, revealing different activation strategies from the central nervous system depending on the mode of contraction of the agonist muscle group. The results of the present work could find applications in clinical fields, especially for rehabilitation protocols. |
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