武术旋风脚转体720°动作起跳阶段人体重心运动学特征的研究

Study on Kinematical Characteristics of the Human Body Center of Gravity in the Take-Off Stage of Whirlwind Kick Two Twists in Wushu

对四川省武术队国家一级和武英级运动员旋风脚转体720°起跳阶段人体重心的运动学特征进行了对比分析。结果表明:助跑最后一步结束左脚着地时刻重心水平速度、缓冲时段重心水平速度的损失与右脚离地时刻垂直速度之间不存在相关关系;右脚离地时刻,重心水平速度的损失率与垂直速度之间为正相关。蹬伸时段重心水平位移与左脚离地时刻重心水平速度、重心垂直速度之间存在显著性相关;在缓冲时段一级运动员没有武英级身体重心低,用时长,然而蹬伸时间没有显著差异,这是一级运动员没有武英级完成动作好的根本所在。

In this article, the method for biomechanical research is adopted to make a comparative study on kinematical characteristics of the human body center of gravity in the take - off stage of whirlwind kick two twists between first -grade athletes and elite athletes. Results show that there is no correlation between the horizontal velocity of the center of gravity when the approach finishes and the left leg touches the ground and the horizontal velocity of the center of gravity when the right leg leaves the ground, or between the loss of horizontal velocity of the center of gravity in the buffering stage and the horizontal velocity of the center of gravity when the right leg leaves the ground. When the right leg leaves the ground, the loss of horizontal velocity is positively correlated with the vertical velocity. In the stretch stage, significant correlation exists between the horizontal displacement of gravity center and the horizontal and vertical velocity of the center of gravity the moment the right leg leaves the ground. In the buffering stage, the human body center of gravity of the first - grade athletes is higher than that of the elite athletes, while there is no marked difference between the duration of stretch, which is the basic reason why the former couldnt perform as well as the latter.