サッカーにおけるボールインパクトの詳細分析

抄録

The kick skill is very important in Soccer. So, many study of motion analysis about kick skill were exist. The ball velocity is used for assessment of kick performance. Furthermore, repulsion ratio or point of where kick impact occur are used for assessment of kick impact performance. To assess kick impact performance, it is considered that three dimensional quantification of impact point is necessary. However, capturing impact point is difficult. Because it is hidden by ball and foot when it is in impact. To detect impact point by using optical three dimensional motion capture system and virtual impact model is aim of this study. The virtual impact model was made as a surface of invisible area composed of virtual markers using coordinate value of captured real markers. As the result, the mean coordinate values of impact point on each trial were below; straight (Horizontal:-24.0±5.6 mm, Frontal:152.7±8.4 mm, Vertical:52.3±4.0 mm), curve (Horizontal:-35.6±4.8 mm, Frontal:151.6±13.7 mm, Vertical:47.5±5.2 mm), knuckle (Horizontal:-33.3±9.0 mm, Frontal:140.8±10.7 mm, Vertical:52.1±2.7 mm). According to comparison of coordinate value of each trial, mean point of straight was nearer the center line of foot on instep, mean point of curve was located in lower than others on inside of foot, mean point of knuckle was nearer the foot joint. We revealed significant difference of coordinate value of impact point using virtual impact model.