抄録
This paper deals with an analysis of a double leg circle of a side horse exercise in gymnastics performed by two gymnasts who are different in the level of performance quality. Two different types of the circle were performed: one was a circle keeping a gravitational center of the body at a higher position and the other was a kind of conventional circle. We obtained three-dimensional position data using 35 markers attached to the player's body, and detected muscle activity using 16 sensors. From the analysis of the data, we concluded that (1) Deltoideus Pars and Triceps Brachii Capt are the essential muscles to perform a circle. (2) In the performance of a circle keeping gravitational center at a higher position, the activities of Rectus Femoris, and Obliquus Externus Abdominis were detected. (3) Training for a quick twisting motion of hips is the key to the effective performance of a circle.
