The effects of long-term bed rest on H-reflex and motor evoked potential in the human soleus muscle during standing

Kentaro Yamanaka, Shin Ichiroh Yamamoto, Kimitaka Nakazawa, Hideo Yano, Yoji Suzuki, Tetsuo Fukunaga

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Abstract

H-reflex and motor evoked potential (MEP) induced by transcranial magnetic stimulation (TMS) in soleus muscle of five normal subjects were investigated before and after 20 days 6°head-down bed rest (BR). Soleus H- reflex during standing following bed rest decreased in all five subjects. The size of the maximum H-reflex (Hmax), expressed as a percentage of the maximum M-response (Mmax), decreased from 63.3 ± 23.3% before BR to 26.7 ± 12.5% after BR. However, there were no significant differences between MEPs before and after bed rest. Moreover, MEP/Hmax after bed rest was larger than before bed rest in all subjects. These results indicate a strong inhibition of H- reflex and no adaptation of MEP in soleus muscle during standing following bed rest.

Original languageEnglish
Pages (from-to)101-104
Number of pages4
JournalNeuroscience Letters
Volume266
Issue number2
DOIs
Publication statusPublished - 1999 May 7

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Keywords

  • Bed rest
  • H-reflex
  • M-response
  • Motor evoked potential
  • Soleus muscle
  • Transcranial magnetic stimulation

ASJC Scopus subject areas

  • Neuroscience(all)

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