Abstract
This study is based on the hypothesis that the Japanese elite male long jumper（personal best was 7,93 m） will improve the performance by “restricting the stride length from 4 steps before the take-off” in the approach run, and intentionally 4 steps before the take-off. The validity of the hypothesis was verified by analyzing the approach run velocity and motion from 4 steps before the take-off between the 2010 season, which tried to shorten the ground contact distance, and the 2009 season, which was the previous year. Although the 2steps before take-off, approach run velocity was reduced in the 2010 season, 1 steps before the take-off, the approach run velocity was comparable to that of the 2009 season, and the approach run with less deceleration was possible. In addition, since the swing leg was attracted at a high speed and was heading for the take-off a high stride frequency, it was possible to perform an effective take-off preparation motion. From these facts, in the subjects of this study, it is effective to intentionally shorten the ground contact position 4 steps before the take-off and to “limit the stride from 4 steps before the take-off” with less speed reduction and effective approach run. It has been shown that it can be a useful method for eliciting preparation take-off movements.
