持久的な間欠的筋力発揮時の筋音（筋振動信号）の変化動態

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  • 森本 茂
    横浜国立大学教育人間科学部学校教育課程保健体育講座

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タイトル別名
  • Mechanomyographical signals during prolonged intermittent muscular contractions at low levels under various duty cycles
  • ジキュウテキ ナ カンケツテキ キンリョク ハッキジ ノ キンオン(キン シンドウ シンゴウ)ノ ヘンカ ドウタイ

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To obtain one of the possible factors on the abrupt increment of mechanomyographic (MMG) signal during prolonged isometric constant contraction (PICC; <20%MVC), the present study focused on the iMMG changes from m. vastus medialis (VM) and/or lateralis (VL) during the intermittent isometric constant contractions (IICC) at various condition of the duty cycle (or relaxation/contraction ratio: R-C ratio) and the target tension. Target tension set at 5, 10 and 15 %MVC and the duty cycle set at 16s-ON/4s-OFF, 56s-ON/4s-OFF and 116s-ON/4s-OFF. Simultaneous recording of myoelectrical signal (MES) was made on VM and/or VL. 1) IMMG increased weakly and monotonously with the cumulative load which is accumulated the acreage of tension and time through the IICC. Also, iMES sustained or increased weakly but the increment ratio was lower than iMES under PICC condition. 2) The increment ratio of iMMG (or gradient of linear regression formula with the cumulative load: G-iMMG) from both muscles increased depend on the increment ratio of the cumulative load (or gradient of linear regression formula with the time) in the stored data under the IICC conditions. But there could not be seen the distinct relation in that of iMES. 3) The G-iMMG decreased with R-C ratio. But G-iMES did not show distinct relationship with R-C ratio among subjects and between muscles. Linear incremental tendency of iMMG would originate from the inserted muscle relaxation during IICC. Therefore, the abrupt increase of iMMG during PICC suggests to be caused from the continuous muscle contraction itself.

収録刊行物

  • 体力科学

    体力科学 65 (1), 177-188, 2016

    一般社団法人日本体力医学会

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