This paper proposes the motion measurement system and analysis method of snowboarder to reveal characteristics of snowboarding turn on an outside actual snowfield. This motion measurement system that consists of 3D gyro sensor, 3-axis acceleration sensor and 3-axis magnetic field sensor can be used easily to the experiment because this system is directly attached to the body of snowboarder and the binding of snowboard. As a result of experiment on the carving turn by the snowboarder installed this system to upper body, lumber, femur and lower thigh and binding, we could obtain angular velocity, acceleration and magnetic field in the parts of body.
Furthermore, we calculated joint angle of lumber, hip, knee and ankle based on the measurement information in order to analyze the motion of snowboarding turn. The joint angle indicated the characteristics of motion, that is, the internal-external motion of hip to twist lower limb and the flexion- extension motion of hip and the plantar flexion-dorsal flexion motion of ankle to generate edging angle in snowboarding turn.
Therefore, the effectiveness and the validity of this motion measurement system and analysis method were proved. This motion measurement system can analyze the major features of snowboarding turn and this analysis method is able to quantitatively evaluate the skill of snowboarders.
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