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Effect of sensory inputs on the soleus H-reflex amplitude during robotic passive stepping in humans

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Abstract

We investigated the modulation of the soleus (Sol) Hoffmann (H-) reflex excitability by peripheral sensory inputs during passive stepping using a robotic-driven gait orthosis in healthy subjects and spinal cord-injured patients. The Sol H-reflex was evoked at standing and at six phases during passive stepping in 40 and 100% body weight unloaded conditions. The Sol H-reflex excitability was significantly inhibited during passive stepping when compared with standing posture at each unloaded condition. During passive stepping, the H-reflex amplitude was significantly smaller in the early- and mid-swing phases than in the stance phase, which was similar to the modulation pattern previously reported for normal walking. No significant differences were observed in the H-reflex amplitude between the two unloaded conditions during passive stepping. The reflex depression observed at the early part of the swing phase during passive stepping might be attributed to the sensory inputs elicited by flexion of the hip and knee joints. The present study provides evidence that peripheral sensory inputs have a significant role in phase-dependent modulation of the Sol H-reflex during walking, and that the Sol H-reflex excitability might be less affected by load-related afferents during walking.

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Acknowledgments

This study was partially supported by the Grant-in-Aid for Young Scientists (B) (No. 19700460) from the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) and Global COE program on “Cybernics: fusion of human, machine, and information systems” from the Japan Society for the Promotion of Science.

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Correspondence to Kiyotaka Kamibayashi.

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Kamibayashi, K., Nakajima, T., Fujita, M. et al. Effect of sensory inputs on the soleus H-reflex amplitude during robotic passive stepping in humans. Exp Brain Res 202, 385–395 (2010). https://doi.org/10.1007/s00221-009-2145-2

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  • DOI: https://doi.org/10.1007/s00221-009-2145-2

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