FACTORS ASSOCIATED WITH DECELERATION OF RUNNING VELOCITY IN THE LAST PHASE OF THE 400-M SPRINT BASED ON KINETICS CHANGES

Abstract

The purpose of this study was to investiThe purpose of this study was to investigate the factors associated with deceleration of running velocity during the 400-m sprint (at the 350-m point) based on kinetics changes. Fourteen male collegiate sprinters performed the 400-m sprint (50.26 ± 2.27 s) at a subjective effort level of 100%. The ground reaction force (1000 Hz) was measured 350 m from the start point, and running movements were recorded from the side by a high-speed camera (300 Hz). The results were as follows: 1) High running velocity was associated with a high stride length. 2) A statistically significant positive correlation was observed between the stride length and the angular impulse of hip flexion in the second half of the support phase. These results suggest that the angular impulse of hip flexion is higher, the leg which has been supported is being swung out forward greatly after ground release.