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

doi:10.1016/S0304-3940(99)00284-0

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

Research output: Contribution to journal › Article › peer-review

29 Citations (Scopus)

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 language	English
Pages (from-to)	101-104
Number of pages	4
Journal	Neuroscience Letters
Volume	266
Issue number	2
DOIs	https://doi.org/10.1016/S0304-3940(99)00284-0
Publication status	Published - 1999 May 7
Externally published	Yes

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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10.1016/S0304-3940(99)00284-0

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

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.",

keywords = "Bed rest, H-reflex, M-response, Motor evoked potential, Soleus muscle, Transcranial magnetic stimulation",

author = "Kentaro Yamanaka and Yamamoto, {Shin Ichiroh} and Kimitaka Nakazawa and Hideo Yano and Yoji Suzuki and Tetsuo Fukunaga",

note = "Funding Information: This study is funded by a part of {\textquoteleft}Ground Research for Sapce Utilization{\textquoteright} promoted by NASDA and Japan Space Forum.",

year = "1999",

month = may,

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doi = "10.1016/S0304-3940(99)00284-0",

language = "English",

volume = "266",

pages = "101--104",

journal = "Neuroscience Letters",

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T1 - The effects of long-term bed rest on H-reflex and motor evoked potential in the human soleus muscle during standing

AU - Yamanaka, Kentaro

AU - Yamamoto, Shin Ichiroh

AU - Nakazawa, Kimitaka

AU - Yano, Hideo

AU - Suzuki, Yoji

AU - Fukunaga, Tetsuo

N1 - Funding Information: This study is funded by a part of ‘Ground Research for Sapce Utilization’ promoted by NASDA and Japan Space Forum.

PY - 1999/5/7

Y1 - 1999/5/7

N2 - 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.

AB - 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.

KW - Bed rest

KW - H-reflex

KW - M-response

KW - Motor evoked potential

KW - Soleus muscle

KW - Transcranial magnetic stimulation

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ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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