Biomechanical analysis on long throw-in technique in soccer

摘要本研究主要目的在探讨足球长传球动作之特性。利用高速摄影机，对大学生足球运动员的掷界外球动作进行三维分析。结果表明，长距离投掷运动员在有效时间内躯干旋转幅度较大，出手点位置较靠前。这些特性对作用在球上的力的增加具有影响，从而导致长投掷距离。此外，由于这些动作相对容易视觉判断，认为这些点可以作为掷球训练的有效评价指标。

The main purpose of this study was to reveal the characteristics of long throw-in motion in soccer. The throw-in motions of university soccer players were analyzed three-dimensionally using high-speed cameras. As a result, large trunk rotation performed at effective time and more anterior position of the ball release point were observed in the motion of long distance thrower. These characteristics have the effect on increase in the force acting on the ball leading to long throwing distance. Moreover, since these motions are relatively easy to judge visually, it was considered that these points can be effectual assessment index for throw-in coaching.