Excitability changes in primary motor cortex just prior to voluntary muscle relaxation

We postulated that primary motor cortex (M1) activity does not just decrease immediately prior to voluntary muscle relaxation; rather, it is dynamic and acts as an active cortical process. Thus we investigated the detailed time course of M1 excitability changes during muscle relaxation. Ten healthy participants performed a simple reaction time task. After the go signal, they rapidly terminated isometric abduction of the right index finger from a constant muscle force output of 20% of their maximal voluntary contraction force and performed voluntary muscle relaxation. Transcranial magnetic stimulation pulses were randomly delivered before and after the go signal, and motor evoked potentials (MEPs) were recorded from the right first dorsal interosseous muscle. We selected the time course relative to an appropriate reference point, the onset of voluntary relaxation, to detect excitability changes in M1. MEP amplitude from 80 to 60 ms before the estimated electromyographic offset was significantly greater than that in other intervals. Dynamic excitability changes in M1 just prior to quick voluntary muscle relaxation indicate that cortical control of muscle relaxation is established through active processing and not by simple cessation of activity. The cortical mechanisms underlying muscle relaxation need to be reconsidered in light of such dynamics.;開始ページ : 110;終了ページ : 115;元資料の権利情報 : (C) 2015 the American Physiological Society

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書名 Excitability changes in primary motor cortex just prior to voluntary muscle relaxation
著作者等 American Physiological Society
鈴木 智高
書名別名 随意筋弛緩直前の一次運動野興奮性変化
出版元 The American Physiological Society
ページ数 v.
大きさ 26-28 cm
ISSN 00223077
NCID AA00703334
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言語 英語
出版国 アメリカ合衆国
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