Document Type



The purpose of this study was to examine acceleration and deceleration profiles throughout the hurdle sprint until the 5th hurdle in terms of step-to-step ground reaction force. Four male collegiate hurdlers (performance range: 13.73–14.27 s) performed two maximal effort 60 m hurdle sprint. Ground reaction forces from the start to the 50 m mark was measured using 54 force platforms. The braking and propulsive impulse, the running speed and the amount of change of the speed at each step were calculated. The current results demonstrate that the force application profiles were different among four steps in one interval of a hurdle sprint, indicating that the role of each step in one interval is different. Moreover, the roles of steps in each interval likely does not change across the four intervals.