Superimposing hip extension on knee flexion evokes higher activation in biceps femoris than knee flexion alone |
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| Institution: | 1. Neuromuscular Research Center, Faculty of Sport and Health Sciences, University of Jyvaskyla, Finland;2. Laboratory “Movement, Interactions, Performance”, Faculty of Sport Sciences, University of Nantes, France;3. Department of Kinesiology, University of Physical Education, Budapest, Hungary;4. School of Sport, Rehabilitation and Exercise Sciences, University of Essex, Colchester, Essex CO4 3SQ, United Kingdom;5. Paul H. Chook Department of Information Systems and Statistics, Zicklin School of Business, Baruch College, The City University of New York, United States;6. School of Sport and Exercise, University of Gloucestershire, UK;1. School of Health and Exercise Science, University of British Columbia, Kelowna, Canada;2. Department of Human Health and Nutritional Sciences, College of Biological Sciences, University of Guelph, Guelph, Ontario, Canada;1. French Institute of Sport (INSEP), Research Department, Laboratory Sport, Expertise and Performance (EA 7370), Paris, France;2. University of Nantes, Faculty of Sport Sciences, Laboratory Movement, Interactions, Performance (EA 4334), Nantes, France;3. Institut Universitaire de France (IUF), Paris, France;1. Human Movement Biomechanics Research Group, Department of Movement Sciences, KU Leuven, Leuven, Belgium;2. Institute for Orthopaedic Research and Training (IORT), Department of Development and Regeneration, KU Leuven, Leuven, Belgium;3. Laboratory “Movement, Interactions, Performance”, Nantes University, Nantes, France;4. Physical and Rehabilitation Medicine Department, University Hospitals Leuven, Belgium;5. Orthopedics Division, University Hospitals Leuven, Leuven, Belgium;1. School of Health Sciences, Centre for Health Sciences Research, University of Salford, Salford, M66PU, UK;2. Faculty of Sport and Health Sciences, Oxford Brookes University, Oxford, UK;3. Instituto de Investigaciones, Escuela de Medicina, Universidad de Santander, Bucaramanga, Santander, Colombia |
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| Abstract: | Hamstring muscle function during knee flexion has been linked to hamstring injury and performance. However, it is unclear whether knee flexion alone (KF) requires similar hamstring electromyography (EMG) activity pattern to simultaneous hip extension and knee flexion (HE-KF), a combination that occurs in the late swing phase of sprinting. This study examined whether HE-KF maximal voluntary isometric contraction (MVIC) evokes higher (EMG) activity in biceps femoris long head (BFlh) and semitendinosus (ST) than KF alone. Effects of shank rotation angles were also tested. Twenty-one males performed the above-mentioned MVICs while EMG activity was measured along ST and BFlh. Conditions were compared using a one-way mixed functional ANOVA model under a fully Bayesian framework. Higher EMG activity was found in HE-KF in all shank rotation positions than in KF in the middle region of BFlh (highest in the 9th channel, by 0.022 mV 95%CrI 0.014 to 0.030] in neutral shank position). For ST, this was only observed in the neutral shank position and in the most proximal channel (by 0.013 mV 95%CrI 0.001 to 0.025]). We observed muscle- and region-specific responses to HE-KF. Future studies should examine whether hamstring activation in this task is related to injury risk and sprint performance. |
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| Keywords: | Isometric contraction Normalisation Semitendinosus Hamstring Hip extension Tibial rotation |
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