Effects of Joint Moments on Horizontal and Vertical Velocities of Body Mass Center during Jumping in Different Directions

Abstract

The purpose of this study was to elucidate the eŠects of the lower limb joint moments on the horizontal and vertical velocities of the body mass center during jumping in diŠerent directions. Ten male university students performed forward, vertical, and backward jumps, during which their jumping motion (150 Hz) and ground reaction force (600 Hz) were collected. Induced acceleration analysis was performed to quantify the body mass center velocity produced by each joint moment. In all jump conditions, the hip, knee, and ankle joints exerted extension and plantar‰exion moments, and most of vertical velocity of the body mass center was produced by the ankle moment. Additionally, the knee moment produced backward velocity and the ankle moment produced forward velocity, while the hip moment produced neither horizontal nor vertical velocities. These results indicate that the knee moment accelerates the body mass center backward and the ankle moment accelerates it upward and forward, regardless of jumping direction. Although there was no signiˆcant diŠerence in the peak joint moments, signiˆcant diŠerences were observed in the horizontal velocities produced by the knee and ankle moments. Moreover, signiˆcant diŠerences were observed in the forward lean angle of the trunk at the beginning of the jump motion and lower limb segments at take-oŠ. These results indicate that the velocity of body mass center was aŠected by not only the joint moments but also body conˆgu-ration.