女子三人膝抛与轿抛配合技术研究

In the 3 women's concerted technology between tosses from kness and cross of hands

研究了技巧女子三人膝抛与轿抛配合技术的运动学特征。结果表明:下面人蹬伸时先展髋后伸膝伸踝,蹬伸前两臂主要起支撑上面人的作用,蹬伸开始后两臂加速上摆。上面人蹬伸时先伸髋和膝后伸踝关节,比下面人较晚。通过动力学特征分析,力值的大小与上下面人的各关节角、质心速度的变化一致。从力学模式的建立与公式推导证明,下面人蹬地力量大、速度快,上面人体重轻,在下面人手上蹬伸速度快而且上下面人蹬伸的时间同步,是三人配合蹬伸的最佳技术。

The study on the kinematic characteristics of the 3 women's concerted technology between tosses from knees and cross of hands shows that when the lower persons strech, they should extend their hips first, then strech theiir kness and ankles. Before streching, their hands mainly play a role of supporting the upper person. After the beginning of the streching, the two arms should speed up and swing up. The upper person should also, shortly after the lower persons, extend her hip and knee and thenstrech her ankles while streching. But the speed of the upper is slower than that of the lower. Based on the analysis of the kinematic characteristics, the amount of the forece value is consistent with the changes of all joint angles and the center of gravity. It has been proved by the mechanical model and the inference of the formula that the streching speed of the lower porsons is faster, and the streching time of the three persons is synchronous. That is the best concerted technology of the streching among the three women.