〈研究資料〉小学校 5，6 年生男子児童における短距離走の回復脚の動作と疾走速度との関係：回復脚の積極的な回復と膝関節の屈曲はどちらを優先して習得すべきか

摘要

Although sprint running has been studied by many investigators, the running techniques taught by a coach have not been researched in detail. The purpose of the present study was to clarify how sprint running is taught to male elementary school students by a coach, focusing on how the motion of the recovery leg affects that of the support leg and running velocity, and whether the forward swing of the thigh or flexion of the knee joint of the recovery leg is most important. Thirty-four 5th and 6th grade elementary school children performed 50-m sprints, and their motions were recorded using a video camera (60 fps). The step length, step frequency, running velocity, relative velocity of the center of mass, and the angles and angular velocity of the thigh, leg and knee were calculated. The main results were as follows: 1.We found a significant positive correlation between running velocity and the relative velocity of the recovery leg around the support phase. 2.Sabsequently to maximize the angular velocity of thigh recovery, a minimum angle of the recovery knee was obtained. These variables showed a significant positive correlation. 3.The time instant to reach the maximal forward swing velocity of the recovery leg was similar to the time instant to reach the maximal backward swing velocity of the support leg. When recovery leg and support leg velocity reached maximal, both leg were intersected.