スクワットジャンプ高の違いが筋力及び筋収縮特性に及ぼす影響

J-GLOBAL ID : 201801000910828540

J-GLOBAL ID : 200901081100961987

The purpose of this study was to clarify the effect of muscle force and contractile properties on squat jump（SJ) performance. The subjects were 142 male collegiate students. The experiment involved the subjects performing a SJ test. Their jump height of SJ were measured using mat switch. The subjects were extracted according to their jump height of SJ by following criteria: Excellent group (HSJ; n＝21, M+1SD) and Poor group (LSJ; n＝21 M-1SD). The peak torque of knee extension and flexion under the condition of isokinetic on angular velocity of 180deg/sec were measured using dynamometer (BIODEX systemⅢ). The contractile properties of rectus femoris (RF), vastus medialis (VM), vastus lateralis (VL) and biceps femoris (BF) in thigh were assessed by tensiomyography (TMG method). Contractile properties of contraction time (Tc) and maximal displacement of the muscle belly (Dm) were analyzed in each groups. Jump height in HSJ was significant higher than LSJ. The peak torque of knee extension in HSJ was significantly higher value than LSJ. And also, same tendency was observed for knee flexion. Tc of RF in LSJ was significantly longer contraction time than HSJ. And also, same tendency was observed for BF. In this study, peak torque for knee extension and flexion in HSJ were significantly differed compare to the LSJ. And contraction time for rectus femoris and biceps femoris in HSJ were significantly lower compared to the LHJ. From these results, it was considered that contraction time and muscle force may affect to squat jump Performance.

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