Studies on the Motion Analysis of Skiing Turns Using the Measurement of Joint Angle and Gliding Velocity of Skier

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This paper deals with the motion analysis of skiing turns using joint angle and gliding velocity of skier. The joint angle is calculated from the 3D orientation estimated by using information from an orientation measurement system. The gliding velocity is estimated from GPS receiver output, accelerometer output and 3D orientation. <BR> The measurement experiment was conducted by skiers, to whom the measurement system was attached. The hip joint angle and the gliding velocity of skidding turn and carving turn were estimated by sensor fusion. The joint angle and the gliding velocity indicated the different motions in these turns. Furthermore, the motion analysis using both the joint angle and the gliding velocity indicated the motion timing at switchover and change of turns and the effect of side skidding.<BR> The results of motion analysis using both the joint angle and the gliding velocity obtained more major features than the motion analysis obtained by using each one alone. The proposed motion analysis method can be used to evaluate the skill quantitatively.