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도움닫기 거리에 따른 수직도 발구름시의 신체 각 관절의 공헌도
배정행(Bae Jeong-Haeng),배영상(Bae Yeoung-Sang),서창익(Suh Chang-ik) 한국체육과학회 2003 한국체육과학회지 Vol.12 No.1
The purpose of this study was to quantify the contribution of body joints for take off of two-foot vertical jump performances with the increase of approach distance. Eight male taekwondo players volunteered to participate as subjects in two-foot vertical jump experiment with one-step, three-steps and five-steps approach distance. The take off phase of vertical jumps were filmed by using 16㎜ high speed camera and measured the ground reaction force by using the force platform simultaneously. At take off, a elapsed time of downward phase was shorter than that of push off, and also decreased the elapsed time of take off with the increase of approach distance. For the downward and push off phase at take off, the contribution of knee joint muscle group was increased significantly with the increase of the approach distance. However, the contribution of hip joint muscle group was decreased significantly with the increase of the approach distance relatively. The legs were the greatest contributors for two-foot vertical jump of each approach distance. The summation of the contributions derived from legs were about 90% for downward and push off phase, respectively. And the contribution of the hip joint was about 50%. The results of this study indicate that while the legs contribution with the increase of approach distance were similar among one-step, three-steps and five-steps, the contributions of each joints of the legs employed to achieve these results were notably different.
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裵永相,裵正幸,徐彰翊,金甲求,朴晟秀 啓明大學校 生活科學硏究所 1996 科學論集 Vol.22 No.-
The purpose of this study was to investigate jumping ability in order to establish proper methods of strength and power training for jumping as pertains to sports. Jumping in sports requires higher jumping in a short amount of time. Eight skilled female modern dancers were instructed to drop jump onto a force platform with both legs from four different heights(15,30,45,60cm). They were filmed from the side with a high speed camera (100fps). The power developed at the ankle, the knee and hip joints was computed by multiplying the moment of force by the joint angular velocity. Mechanical energy was absorbed by the eccentric contraction of the ankle and knee joint muscles during phase of downward movement. Mechanical energy absorption rate by eccentric contraction related to the knee joint muscle at high load intensity was relativly higher than low load intensity. It required the energy absorption by the eccentric contraction of knee joint muscles in order to reduce take off time in phase of downward movement. In push off phase, it projected the body into the air by the concentric contraction of ankle and knee joint muscles.
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