2015 Volume 29 Issue 1 Pages 13-21
The purpose of this study was to examine the characteristics of the kick start lateral. Subjects were 13 male college swimmers and 14 male physical education students, and they were divided into the upper skilled group (n＝6), the lower skilled group (n＝7) and unskilled group (n＝14) by the 5m time.
The higher the group’s skill was, the higher the 5m time and the 5m velocity (p<.05-01). The higher the group’s skill was, the shorter the block time were (p<.05-01), due to the shortening of the start of knee angle extention in the rear leg (p<.01). There was no significant difference between each groups in the entry velocity. The higher the group’s skill was, the higher the velocity maintenance rate (the entry velocity / the 5m velocity) was (p<.05-0.1), however. The angle of projection on take-off significantly correlated with the difference in height of the center of gravity between the time of start position and take-off (p<.01), and the latter significantly correlated with the difference in upper body angle between the time of start position and take-off and with the minimum knee angle in the front leg (p<.01).
It was thought that the difference of the velocity maintenance rate was caused by the high entry technique of skilled groups, because the differences between the skilled groups and the unskilled group were most noticeable (p<.01) in the angle of projection on entry, the attitude angle on entry and the angle of attack on entry.
