No evidence hip joint angle modulates intrinsically produced stretch reflex in human hopping |
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| Authors: | W Gibson A Campbell G Allison |
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| Institution: | 1. School of Physiotherapy, The University of Notre Dame Australia, Fremantle, WA, Australia;2. School of Physiotherapy, Curtin University, Perth, WA, Australia;1. Movement Analysis Lab, Institute for Experimental Musculoskeletal Medicine, University Hospital Münster, Germany;2. Gait Lab, Sozialpädiatrisches Zentrum Westmünsterland, St.-Vincenz-Hospital Coesfeld, Germany;1. Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, United States;2. Center for Movement Disorders and Neurorestoration, University of Florida, Gainesville, FL, United States;3. Department of Neurology, University of Florida, Gainesville, FL, United States;1. Sint Maartenskliniek, Research, Development and Education, Nijmegen, The Netherlands;2. Sport Medisch Centrum Papendal, Arnhem, The Netherlands;3. HAN University of Applied Sciences, Institute Health Studies, Nijmegen, The Netherlands;4. Research Center for Movement Control and Neuroplasticity, Department of Biomedical Kinesiology, Katholieke Universiteit Leuven, Leuven, Belgium;1. Biomechanics and Movement Science Program, University of Delaware, Newark, DE, United States;2. Delaware Rehabilitation Institute, University of Delaware, Newark, DE, United States;3. Department of Mechanical Engineering, University of Delaware, Newark, DE, United States;4. Department of Physical Therapy, University of Delaware, Newark, DE, United States |
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| Abstract: | Motor output in activities such as walking and hopping is suggested to be mediated neurally by purported stretch reflex augmentation of muscle output. Reflex EMG activity during these tasks has been frequently investigated in the soleus muscle; with alterations in reflex amplitude being associated with changes in hip joint angle/phase of the gait cycle. Previous work has focussed on reflex activity induced by an artificial perturbation or by induction of H-reflexes. As such, it is currently unknown if stretch reflex activity induced intrinsically (as part of the task) is modulated by changes in hip joint angle. This study investigated whether hip joint angle modulated reflex EMG ‘burst’ activity during a hopping task performed on a custom-built partially reclined sleigh. Ten subjects participated; EMG and kinematic data (VICON motor capture system) was collected for each hop cycle. Participants completed 5 sets of 30 s of self-paced hopping in (1) hip neutral and (2) hip 60° flexion conditions. There was no difference in EMG ‘burst’ activity or in sagittal plane kinematics (knee/ankle) in the hopping task between the two conditions. The results indicate that during a functional task such as hopping, changes in hip angle do not alter the stretch reflex-like activity associated with landing. |
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| Keywords: | Stretch reflex EMG Hopping Gait |
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