In this paper, we propose an attempt at dynamics analysis and measurement method of snowboarding turn that is performed on an outside actual snowfield. We assumed the torso and lower limbs of a snowboarder to constitute a three-dimensional rigid link model . This model consists of an upper body, a lumbar part, a pair of thighs, lower thighs and feet and has total 20-degree-of-freedom. Then, joint moments were calculated by applying the Newton-Euler method in order to estimate the load that

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... ts each joint. The measurement system utilized a three-dimensional gyro sensor to measure physical exertion of snowboarder and a 6-axis force sensor that measured reaction force from the snow surface. By applying this measurement system, a measurement experiment was carried out at a ski area. The measurement results (angular velocity, angle and joint moment) indicated the major features of snowboarding turns and we could quantify characteristics and estimate the loads exerted on snowboarders in each phase of turning.