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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
한국사회체육학회 한국사회체육학회지 한국사회체육학회지 제22권
발행연도
2004.11
수록면
485 - 495 (11page)
DOI
10.51979/KSSLS.2004.11.22.485

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초록· 키워드

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The purpose of research is to improve the evolution method of swimming players` skill and turning direction technique by comparing and analizing players` section records and detailed turning motion in freestyle swimming. In order to complement, top prize winners` section records, from 5m before turning to 8m after turning, were measured and two representative players` good and bad motions were reviewed by analizing the detailed motions taken by the underwater video camera. The results were as follows. 1. The record for the phase of turn was similar to the rank of the last record. In case of 200m events the 1st turn was the fastest and it took more time as the turn is repeated. 2. It shows that the preparation phase and turning motion cause the difference between the players and within one player. 3. As the span of vertical movement of the players` heads became shortened, their vertical movement and rotation speed got faster, which is regarded as their heads rotated fast. In addition, it showed that the time lag, from the turning point to the movement of touching wall, also got faster as the span of their vertical movements became narrowed. In case of bad motions, players tend to put up their heads upward from the turning point. Those motions are required to be revised. 4. In terms of the distance between center of gravity and center of head, it shows that the nearer it is, the faster head`s rotation get. The short distance between them means that it is possible to rotate quickly by keeping head close to body as much as possible. In actual, the distance between them widens gradually after the turning motion, which means that the center of gravity moves to the opposite direction. 5. The horizontal movement of center of gravity moves to turning point slowly in the preparation phase, does not move nearly in the turning phase and increase again in the propulsion phase. Good record has short time for turn phase. The result means that the shorten the turning phase is the most important factor. Therefore the preparation for this is required. The vertical movement is maintained or increase a little and then move to from the turning phase. 6. The characteristic of horizontal velocity in center of gravity is that there is any big changes at the preparation phase, the faster velocity is found from the better record and the accelerating time is fast at the propulsion phasen. The wrong motion is made by not using the swimming velocity for turning and waiting and more time is required by this. 7. The angle of knee and incidence when the player touch the turning point are 106.22~-122.91 and 93.41~100.26. The size of maximum angle of knee did not match with the required time of propulsion phase. It seems that the individual difference is big when the players touch the turning point the angle of knee and incidence. The research for the individual angle which can reveal the maximum power should be carried out.

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