EFFECTS OF SHORT-TERM IMMOBILIZATION ON THE MAXIMUM VOLUNTARY CONTRACTION FORCE ANALYZED BY THE TWITCH INTERPOLATION METHOD

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  • YAMADA HIROSHI
    <I>National Institute of Advanced Industrial Science and Technology, Institute for Human Science and Biomedical Engineering</I>
  • KIZUKA TOMOHIRO
    <I>University of Tsukuba, Institute of Health and Sport Sciences</I>
  • MASUDA TADASHI
    <I>National Institute of Advanced Industrial Science and Technology, Institute for Human Science and Biomedical Engineering</I>
  • SEKI KAZUHIKO
    <I>University of Washington, Department of Physiology and Biophysics Seattle</I>
  • YOKOI TAKASHI
    <I>National Institute of Advanced Industrial Science and Technology, Institute for Human Science and Biomedical Engineering</I>
  • KANEKO FUMINARI
    <I>National Institute of Advanced Industrial Science and Technology, Institute for Human Science and Biomedical Engineering</I>
  • OKADA MORIHOKO
    <I>University of Tsukuba, Center for Tsukuba Advanced Research Alliance</I>

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Other Title
  • 短期筋固定が最大随意収縮力に与える影響のTwitch Interpolation法による解析
  • タンキキン コテイ ガ サイダイ ズイイ シュウシュクリョク ニ アタエル エイキョウ ノ Twitch Interpolationホウ ニ ヨル カイセキ

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The purpose of this study was to examine the effects of short-term immobilization on the maximum voluntary contraction (MVC) force. The first dorsal interosseus (FDI) of 10 healthy male adults was immobilized for 1 week using casting tape. Atrophy of the muscle was estimated from a cross sectional view of magnetic resonance images (MRI) . To clarify the factors of a peripheral neuromuscular system contributing to the change in the MVC force, twitch force at rest was measured. The contribution of central factors was estimated from a voluntary activation (VA) index, which was obtained by the twitch interpolation method.<BR>The MRI showed no significant changes in the cross sectional area. The MVC force declined after immobilization (p<0.01), and recovered after 1 week from the termination of immobilization (p<0.01) . Both the twitch force at rest and the VA at MVC declined after immobilization (p<0.01), and recovered after 1 week (p<0.05) .<BR>The results indicate that the temporary decline of the MVC force was not accompanied by atrophy of the muscle. Furthermore the decline of the MVC was caused both by the deterioration of peripheral and central functions in the neuromuscular system. Possible factors in the peripheral and central neuromuscular systems affected by the immobilization were discussed.

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