Differential regulation of crossed cutaneous effects on the soleus H-reflex during standing and walking in humans |
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Authors: | Shinya Suzuki Tsuyoshi Nakajima Rinaldo A. Mezzarane Hiroyuki Ohtsuka Genki Futatsubashi Tomoyoshi Komiyama |
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Affiliation: | 1. Division of Health and Sports Education, The United Graduate School of Education, Tokyo Gakugei University, Tokyo, Japan 2. Department of Integrative Physiology, Kyorin University School of Medicine, Tokyo, Japan 3. Laboratory of Signal Processing and Motor Control, College of Physical Education, University of Brasília, Brasília, Brazil 4. Biomedical Engineering Laboratory, EPUSP, PTC, University of S?o Paulo, S?o Paulo, Brazil 5. Division of Health and Sports Sciences, Faculty of Education, Chiba University, 1-33 Yayoicho, Inageku, Chiba, 263-8522, Japan 6. Department of Physical Therapy, School of Rehabilitation Sciences, Health Sciences University of Hokkaido, Hokkaido, Japan
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Abstract: | Although sensory inputs from the contralateral limb strongly modify the amplitude of the Hoffmann (H-) reflex in a static posture, it remains unknown how these inputs affect the excitability of the monosynaptic H-reflex during walking. Here, we investigated the effect of the electrical stimulation of a cutaneous (CUT) nerve innervating the skin on the dorsum of the contralateral foot on the excitability of the soleus H-reflex during standing and walking. The soleus H-reflex was conditioned by non-noxious electrical stimulation of the superficial peroneal nerve in the contralateral foot. Significant crossed facilitation of the soleus H-reflex was observed at conditioning-to-test intervals in a range of 100–130 ms while standing, without any change in the background soleus electromyographic (EMG) activity. In contrast, the amplitude of the soleus H-reflex was significantly suppressed by the contralateral CUT stimulation in the early-stance phase of walking. The background EMG activity of the soleus muscle was equivalent between standing and walking tasks and was unaffected by CUT stimulation alone. These findings suggest that the crossed CUT volleys can affect the presynaptic inhibition of the soleus Ia afferents and differentially modulate the excitability of the soleus H-reflex in a task-dependent manner during standing and walking. |
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