OPTIMIZATION OF GROUND REACTION FORCE DURING 100m-SPRINT

Abstract

The purpose of this study is to optimize the individual 100m-sprint performance by the optimal control of ground reaction force. Subject was a national level athlete, best performance 10.65s. Kistler force-plat and LOCAM Hi-speed camera was used to record the ground reaction force and the movement. Applying optimization theory and algorithms, the ground reaction force was altered reasonably, in order to increase the velocity of body c.m. during each support phase. It is found that the final velocity of body c.m. during support could be increased 0.05m/s through optimization of ground reaction force and the performance of subject for 100m could therefore be improved approximately 0.06-0.08s. This improvement is achieved only by changing the patterns of ground reaction force. In other words, it is obtained by rational force generation.