基于三维虚拟现实技术对周施雄双杠后上转体450°成倒立动作的分析

在世界上，中国运动员周施雄首次完成双杠后上转体450°成倒立动作。本文应用三维录像解析法对周施雄在比赛现场所做的后上转体450°成倒立动作采集运动学数据，利用沉浸式三维虚拟现实技术对获得的运动学数据进行重建，通过360°的旋转再现观察，以三维动画的形式进行运动学分析。研究发现周施雄在比赛中虽然完成了这一动作，但还有待完善。主要问题有上摆阶段伸髋较早、幅度稍大，导致在下一阶段的转体过程中单臂支撑的时候人体重心离支撑点的水平距离偏大，身体产生了倾斜，影响了之后的倒立动作，另外在转体阶段两腿并未完全并拢。

3 D Virtual Reality Technology-Based Analysis of Zhou Shixiong' s Action of 5/4 Turn to Handstand on Parallel Bars

For the first time in the world, Chinese athlete Zhou Shixiong completed 450° turn to handstand on parallel bars. This article applies 3D video analytic method to collect Zhou Shixiong' s kinematic data in the competi-tion, uses immersive 3D virtual reality technology to reconstruct the obtained kinematics data, and makes kine-matics analysis in the form of three dimensional animation after 360° rotation-reproduced observations. The study shows that although Zhou Shixiong completed this action in the game, it is still not perfect. The main problems include that he stretches hip earlier, and his swing scope is slightly wide in upswing stage. This leads to the result that when he supports his body with one arm, the horizontal distance between his body center of gravity and the supporting point is too wide. As a result, his body tilts and this affects his subsequent handstand action. Besides, his two legs are not fully closed in the swiveling phase.