지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2012.8
- 수록면
- 1,013 - 1,020 (8page)
- DOI
- 10.51979/KSSLS.2012.08.49.1013
이용수
초록· 키워드
오류제보하기
This research aims to kinematically analyze the movements of Korean male shot-putters who participated in IAAF World Championships Daegu 2011. To accomplish this purpose, this research analyzed seven factors executive time of delivery phase, center of mass (COM) displacement, center of mass (COM) velocity, release angle, release height, release velocity and shot trajectories of ball. This research drew the following conclusions. First, for executive time of delivery phase, P2 (Phase 2) was long. So, horizontal rapid acceleration should be obtained by shortening the executive time of glide phase. This will exercise a positive influence on a throwing distance. Second, vertical displacement of center of mass is the process of momentum transfer from proximal muscle to distal muscle in shot-putting. During the process, in E3 (Event 3) energetic knee extension is done to transfer effective and explosive powers. A shot-putter should do the following sequential movements by using elasticity of waist twisting: moving the upper body forward and stretching one arm. Third, COM velocity according to executive time of delivery phase falls in the landing moment of back feet (i.e. E3 (Event 3)) and the release moment (i.e. E5 (Event 5)). A shot-putter needs an active play in that the passive play of the shot-putter who considers the foul of release moment acts as a factor of reducing COM velocity and that the reduction of speed interrupts momentum transfer. Fourth, contrary to world-class/international shot-putters, Korean players showed greater differences of release velocity compared to release angle and release height. To overcome this, they should increase COM velocity in E3 and E5 more. Active and dynamic movements are prerequisite for an increase in the speed. Finally, shot trajectories of ball showing its movements and re lease direction tend to fly to the right when a shot-putter releases the ball. The tendency is caused by the wrong rotation of the body, that is, the improper momentum transfer in the skill types for glide of release methods of straight line. This results in a loss of throwing distance. To make up for the weak point, a shot-putter should correct his body rotation. This can be expected to contribute to a rise in release velocity acting as an important factor of throwing distance.
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