跳馬における伸身カサマツ跳び動作の局面別力学的分析
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概要
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This paper aims to closely examine how the difference of kinetic variables by take-off state of Vault Kasamasu stretched motion would have an effect on the rotation of the post flight and landing. For this, this researcher made 3 time performance of 3 national artistic gymnastics athletics 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 board and the horse and comparing the kinetic variables, got the following conclusion. 1. The more skilful, the motion at contact board, the shorter the time and moving distance of the pre-flight becomes as it has a rapid access to the board, and converts to vertical upward motion. On the contrary, the big motion according to the increase of moving distance and flight time increases the force applied to the horse, but makes the body fall forward, resulting in the decrease of flight power. 2. At the time of take-off the horse, rapid ascending velocity and maintenance of the body angle close to vertical state increases the time and moving distance of the post-flight, and enables rotation motion in the air. This is the result of enlarging the shoulder angle, lessening the body angular velocity and approaching to the vault for stronger Blocking motion. Also prolongation of contact at the board and rapidity of the body angular velocity causes a barrier to the maintenance of Blocking angle, and has an side effect on the increase of post-flight and flight height. 3. At the post-flight, enlargement of twisting distance before peak, rapidly finishes the 1st round twisting motion, generates proper control of the position and velocity of body CG before landing and enables stable landing motion. On the other hand, passive twisting motion and short flight distance at the initial state of flight rotation focuses on twisting motion and rotation motion to the end and induces unstable landing motion.
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