Enhanced stretch reflex excitability in the soleus muscle during passive standing posture in humans |
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| Authors: | Sachio Shimba Noritaka Kawashima Yuji Ohta Shin-Ichiroh Yamamoto Kimitaka Nakazawa |
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| Affiliation: | 1. Graduate School of Engineering, Shibaura Institute of Technology, 307 Fukasaku, Minuma, Saitama 337-8570, Japan;2. Department of Rehabilitation for Movement Functions, Research Institute, National Rehabilitation Center for Persons with Disabilities, 4-1 Namiki, Tokorozawa, Saitama 359-8555, Japan;3. Lyndhurst Center, Toronto Rehabilitation Institute, 520 Sutherland Dr., Toronto, Ontario M4G 3V9, Canada;4. Japanese Society for Promotion of Science, 1-8 Chiyoda, Tokyo 102-8472, Japan;5. Faculty of Human Life and Environmental Science, Ochanomizu University, 2-1-1 Otsuka, Bunkyo, Tokyo 112-8610, Japan;1. Radboud University Medical Center, Donders Institute for Brain, Cognition and Behaviour, Department of Rehabilitation, Nijmegen, The Netherlands;2. School of Kinesiology, University of British Columbia, Vancouver, BC, Canada;3. Research Center for Movement Control and Neuroplasticity, Department of Kinesiology, KU Leuven, Leuven, Belgium;4. Sint Maartenskliniek Research, Nijmegen, The Netherlands;1. Laboratory of Motor Control and Learning, Department of Physical Education and Sport Science, Aristotle University of Thessaloniki, Greece;2. Laboratory of Neuromechanics, Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Greece |
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| Abstract: | The purpose of this study was to test whether the spinal reflex excitability of the soleus muscle is modulated as posture changes from a supine to a passive upright position. Eight healthy subjects (29.6 ± 5.4 yrs) participated in this study. Stretch and H-reflex responses were elicited while the subjects maintained passive standing (ST) and supine (SP) postures. The passive standing posture was accomplished by using a gait orthosis to which a custom-made device was mounted to elicit stretch reflex in the soleus muscle. This orthosis makes it possible to elicit stretch and H-reflexes without background muscle activity in the soleus muscle. The results revealed that the H-reflex amplitude in the ST was smaller than that in the SP condition, which is in good agreement with previous reports. On the other hand, the stretch reflex was significantly larger in the ST than in the SP condition. Since the experimental conditions of both the stretch and H-reflex measurements were exactly the same, the results were attributed to differences in the underlying neural mechanisms of the two reflex systems: different sensitivity of the presynaptic inhibition onto the spinal motoneuron pool and/or a change in the muscle spindle sensitivity. |
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