Influence on the excitability of spinal neural function of motor imagery in the thumb and index finger opposition position with orthosis

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  • Maeda Akihiro
    Department of Rehabilitation, Kiba Hospital
  • Fukumoto Yuki
    Graduate School of Health Sciences, Graduate School of Aomori University of Health and Welfare Clinical Physical Therapy Laboratory, Faculty of Health Sciences, Kansai University of Health Sciences
  • Bunno Yoshibumi
    Clinical Physical Therapy Laboratory, Faculty of Health Sciences, Kansai University of Health Sciences Graduate School of Health Sciences, Graduate School of Kansai University of Health Sciences
  • Suzuki Toshiaki
    Clinical Physical Therapy Laboratory, Faculty of Health Sciences, Kansai University of Health Sciences Graduate School of Health Sciences, Graduate School of Kansai University of Health Sciences

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  • 装具を用いて母指と示指を対立肢位に固定した時の運動イメージが脊髄神経機能の興奮性に与える影響
  • ソウグ オ モチイテ ボシ ト ジシ オ タイリツシイ ニ コテイ シタ トキ ノ ウンドウ イメージ ガ セキズイ シンケイ キノウ ノ コウフンセイ ニ アタエル エイキョウ

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Abstract

<p>In this study, we examined the effect on the excitability of the spinal neural function of motor imagery in the thumb and index finger opposition position with opponens orthosis. We analyzed 10 healthy subjects. In the motor imagery with orthosis trial, F-waves were recorded during relaxation (rest trial). Subsequently, the subjects practiced isometric thenar muscle activity at 30% maximum voluntary contraction using visual feedback for 1 min. Then, F-waves were recorded while the subjects performed motor imagery in the opposition position with orthosis (image with orthosis trial). After the motor imagery task, F-waves were recorded during relaxation (post-image trial). In the motor imagery without orthosis trial, F-waves were recorded during rest, image without orthosis, and post-image trials on another day. The relative values of persistence and F/M amplitude ratio during the image with orthosis trial were significantly higher than those of the without orthosis trial. Motor imagery with proprioceptive input can increase the excitability of spinal neural function. In clinical settings, it is important to perform motor imagery in a position similar to that during actual activity.</p>

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