315 Comparison of various forms of performing the double-leg circle on the pommel horse

Abstract

This paper deals with a comparison of three different types of double leg circles performed by three gymnasts. The differences were examined between circumferential speeds, between heights of gravitational center, and between angular velocities of hip rotational motion around the body axis. We obtained three-dimensional position data using 35 markers attached to the gymnast's body and detected muscle activities using 24 sensors. As a result we conclude as follows: (1) In order to perform graceful double leg circles, a quick hip rotational motion is required. (2) This performance is associated with the acceleration of hip rotational motion in advance of the start of the hip rotation. (3) It is suggested that the muscle activities not only of the upper part but also the lower part of the body are required for the performance.