도마 손 짚고 옆 돌아 몸 펴 뒤 공중 돌며 2회전 비틀기 동작의 역학적 분석 = A Kinetic Analysis of Akopian Motion at Horse Vaulting

다국어 초록 (Multilingual Abstract)

This paper aims to closely examine how the difference of kinetic variable by the take-off step of Akopian motion on the Vaulting horse would influence the post flight Akopian. For this, this researcher made 3 time performance of the national athlete, Yang, Tae-young (artistic gymnast) the subject of research, and as a result of a three dimensional analysis using the high speed video camera and measuring the force applied to the contact board and the horse and comparing the kinetic variables, got the following conclusion.
1. The more excellent motions, the larger the horizontal displacement of body CO by lowering the body and speeding up the angular velocity of the body, and in take-off the board, the motion of strongly kicking the legs backward, and converting to vertical upward motion is shown. This shows that the post flight led somersaulting and twisting motions in descent by keeping the body CG high and somersaulting angular distance and twisting angular distance large and performed stable landing by keeping somersaulting angular distance and twisting angular distance before peak large.
2. The more unskillful, the more upward the motion at board contact is, the larger the horizontal displacement, and the less the horizontal velocity reduction of body CG. This velocity maintenance and increase of moved displacement causes a barrier to blocking motion, so has a side effect on vertical upward motion at board contact and somersaulting and twisting motions at the post-flight.
3. As for Akopian motion on the Vaulting horse, the maximum horizontal reaction-force of board contact was less than that without it, and as for the force applied to the horse contact, maximum horizontal reaction-force and maximum vertical reaction-force were all large.
4. As for Akopian motion on the Vaulting horse, the unskillful the motion, the larger vertical reaction-force, and the excellent the motion, the less horizontal reaction-force, but the larger the vertical reaction-force. Also excellent motions show the state of addition and reduction of vertical reaction-force deemed as generated by the angular motion of fingers, wrist joint and arm joint just before take-off the horse contact.