The purpose of this research was to compare and make clear the difference between the side-foot kick motion of a stationary ball and a rolling ball. Twelve male university soccer players served as subjects. These subjects aimed for a target placed right in the middle of the goal, 7 meters ahead. The rolling ball was given by a 1.5 meter high 2-railed ball dispenser. The kick motion was taken picture by using an optical motion capture system. The kick motion of a rolling ball was distinctive by these ways. 1) The initial velocity of the ball was at the same level, but swing speed was slower than the side-foot kick motion of a stationary ball. 2) The kicking leg hip angle was not as extended as in a stationary ball kick.3) Considering that minimum flexion and extension angular velocity of that were large and small respectively, the kick was done by not practically using the knee jointʼs flexion/extension, and making the back swing small. From the above results, the kick motion of a rolling ball was overall compact compared to that of a stationary ball.
