変位筋音図のFusion index曲線と筋線維構成比との関係  [in Japanese] The Relationship between Fusion Index-Frequency Curve of Displacement-MMG and Fiber Composition of Skeletal Muscle  [in Japanese]

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Abstract

<p>強縮の進行度合いを示すFusion indexと刺激周波数との関係を表す曲線は, Fusion index-Frequency Curve (FFC) と呼ばれ, 2つのパラメータk, hで構成されるシグモイド関数 (FFC-equation) で表現できる. 本研究では, 筋線維構成比が異なるラットの腓腹筋, ヒラメ筋, 中間広筋を対象として, 変位筋音図のFFCを測定し, FFC-equationを適用させた. その結果, FFC-equationは変位筋音図にも適用させることが可能であり, kおよびhは, 単収縮からも簡易的に推定できることなどがわかった.</p>

<p>The fusion index (FI) measured by muscle force is an index that can evaluate the tetanic progression of the skeletal muscles. The relationship between the FI and stimulation frequency is named a Fusion index - Frequency Curve (FFC). The FFC is expressed by the sigmoid function composed of two parameters (k and h). However, there are no reports of the FFC-equation applied by displacement MMG. In this study, FFCs of displacement MMG in gastrocnemius, vastus intermedius and soleus muscles of rats were measured, and FFC-equation was applied. As a result, the FFC waveforms of the displacement MMG resembled those of muscle force. FFC-equation can be applied to FFC of displacement MMG. The k parameter was affected by fiber compositions. In addition, k and h parameters can be easily estimated by the twitch. The k parameter of the displacement MMG may evaluate the change of fiber compositions caused by the muscle training, aging, disuse of muscle, and rehabilitation therapy.</p>

Journal

  • Biomechanisms

    Biomechanisms 20(0), 207-216, 2010

    Society of Biomechanisms

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