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

利用三维运动分析系统，对实验室中日本顶尖跳台滑雪运动员的模拟跳跃运动进行了分析。利用“足部扫描”系统检测了静、动态条件下的足部压力分布，对起飞阶段的COP进行了分析。本实验的主要目的是了解运动员在起跳设定位置时脚掌掌掌的位置，以及在起跳运动中脚掌掌掌掌的运动轨迹和“感受”脚掌的压力点的特点。研究结果如下：1)利用三维运动分析和足部扫描系统，使跳台运动员及其教练和研究人员有机会在实验过程中和实验结束后讨论实验结果。检查了各跳远运动员脚底的COP位置，讨论了跳远运动员的最佳位置。2)抓手的位置和抓手在脚底上的移动的结果表明，他在起跳阶段的起跳风格之间存在着有趣的关系。利用足部扫描的COP实验结果，了解了运动员的起跳方式特点，解决了运动员的问题。在2006年都灵奥运会上，他科学地展示了自己的优点和缺点，并取得了自己的最佳成绩。6.3)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，并应用于老年人的步态分析，以更好地训练和指导系统。

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.