表面筋電図を用いたスキー運動後の局所筋疲労度の評価に関する研究

概要

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The purpose of this study was to evaluate the localized muscle fatigability that occurred with skiing, by using surface electromyography. Three healthy male subjects exerted 75% maximum voluntary contraction of isometric knee extension until exhaustion before and after skiing. Bipolar surface EMGs were obtained from the vastus lateralis muscle during the isometric contractions. The myoelectric signals were A/D converted with 2kHz sampling frequency, and median frequency (MDF) were calculated. Skiing for about four hours did not affect the force during maximum voluntary contraction (MVC) and endurance time (ET). The MDF of surface EMG decreased during the fatigue task in all subjects, indicating the accumulation of byproducts such as lactic acids. The rate of decrease in MDF showed a tendency to increase after skiing. These results suggest that the localized muscle fatigability after skiing may be evaluated using surface electromyography.