211 The effects of forces applied to starting block at the block clearance on sprint start

Abstract

In the sprint, the sprinters are required to use starting blocks at the crouch start. Therefore, it is important to clarify the effects of the forces applied to starting block at the block clearance on the sprint start. The purpose of this study is to examine the effects of the forces applied to starting block on the start movements. From starting blocks, a sprinter did three different "starting dash" as is done in a sprint running race (normal), pushing the starting block stronger (more), and pushing a little starting block (less) . The forces applied to the right and left starting block were measured by with the force plates(1kHz). And, the block clearance movement was recorded by Hi-speed camera (250Hz).The results can be summarized as follows. 1: Although the strength pushing the block is varied, impulses applied to the starting block did not change significantly. But it was inferred that the rear leg clearance movement and the block clearance time is related with adjusting the impulses applied to the starting block. 2: It was inferred that strength pushing the starting block affects the start movement as well as applying the force at the first and second step after the block clearance.