A study on the best motion of ski jumping in take off phase : An analysis of feeling of pressure from the ground

要求日本顶级跳台滑雪运动员在实验室中使用3D运动分析系统对模拟跳跃运动进行分析。利用“足部扫描”系统测量了静态和动态条件下的足部压力分布，分析了起飞阶段的性能系数。本实验的主要目的是了解在起跳的设定位置时，COP的位置，以及在起跳运动中COP的轨迹特征和”感受”足底压力点的情况。研究结果表明：1）通过三维运动分析和足部扫描系统，运动员和教练员以及研究人员可以在实验过程中和实验结束后对结果进行讨论。2）COP在脚掌上的位置和行程的结果表明，起跳阶段COP在脚掌上的位置和行程与运动员的起跳方式有着密切的关系。利用足部扫描的COP实验结果，了解运动员起跳方式的特点，解决问题。在2006年的都灵奥运会上，COP科学地展示了他跳跃的优点和缺点，并表现出了他最好的跳跃。3）我们有一个未来的实验计划，将这些足部扫描系统应用于实际的跳台滑雪条件，并对老年人进行步态分析，以获得更好的训练和指导系统。

The Japanese top ski jumpers were requested to analyze the simulated jumping motion in laboratory, using 3D motion analysis system. The COP of take off phase was also analyzed by "foot scan" system which has detected distribution of foot pressure in static and also dynamic conditions. The main point of the experiment was to understand the position of COP during the set position of take off and the characteristic of the trace of COP during take off motion and" feeling" the pressure point of his sole. The following results were obtained :1)By using 3D motion analysis and foot scan system, the ski jumper and his coach and also researchers could have a chance to discuss the result during and just after the experiment. Which position of COP on sole of each jumpers were checked and had discussed the best position of the jumper.2)The result of the COP position and travel of the COP on his sole indicated interesting relationship between his jumping style at take off phase. By using the experimental result of COP from foot scan, the athlete well understood his characteristic of take off style and solved his questions. The COP presented the merit and also the demerit of his jumping scientifically and performed his best jumping in the Torino Olympic Game in 2006.3)We have a future experimental plan of application of these foot scan system in an actual ski jumping condition and also to the gait analysis in elderly people for a better training and instruction system.