等尺性筋収縮における筋電図と筋機図の周波数解析による比較

概要

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The muscular activity of rectus femoris (RF) in voluntary isometric knee joint extension was measured by electromyogram (EMG) and mechanomyogram (MMG), and the frequency analysis has done using Fourier transform, and the frequency response of muscular activities was examined. The subjects were normal healthy volunteers (7 men), and the target muscle was RF. The method was to measure maximum voluntary contraction (MVC) in isometric knee joint extension and to measure surface EMG and MMG, keeping the muscle force of 20%, 40%, 50%, 60%, 70% and 80% MVC, respectively, in the fixed time calculated from measured MVC. The measurement was carried out in sitting position. The flexions of knee joint were 90 and 60 degrees. And, the hip joint flexion was 90 degrees, the lower leg rotation 0 degree, and the ankle joint dorsiflexion 0 degree. As a result, it was known that EMG detects electrical activity itself of muscle. However, it was also made clear that MMG is detecting the change of proper oscillation frequency of muscle by the change of muscle compliance. The change of muscle compliance is correlated with rate cording and recruitment. Then, it suggests that the status of muscle contraction is especially sensitively detected by MMG.mechanomyogramelectromyogramfrequency analysisisometric extensioncompliance
東北大学の論文
2003-03-20