抄録
In order to develop a feedback system for improving the performance, it would be efficient to show kinematic and kinetic information to players during immediate feedback. The purpose of this study was to develop a portable posture analysis system, using inertial sensors, that estimates configuration of high-speed swing limbs during swing motion (e.g. running motion) for immediate feedback in coaching field utilization. The swing leg motion was analyzed using IMUs output signals. The IMUs were attached on the lower trunk, thigh, shank and foot segments. The error of the estimated hip joint acceleration from IMU of the lower trunk and from IMU of the foot segment was minimized to identify 9 parameters of initial coordination system of the segments by using partial differential method. By solving the equation relating accelerometer sensor outputs to gyro sensor outputs, we can obtain initial orientation of individual segments, and can calculate motion data using the initial orientation, gyro sensor outputs, and accelerometer output of the segments. The results obtained from the estimated motion data show almost good agreements in terms of swing leg configuration.
