抄録
This paper deals with the estimation of lower limb muscle tension and the motion analysis of skier gliding on the actual snow field. The lower limb muscle tension is estimated by the measurement information of motion and reaction force from snow surface.
The motion measurement system that consists of the gyro sensor, the acceleration sensor and the magnetic field sensor measures the 3-axis angular velocity, the 3-axis acceleration and the 3-axis magnetic field. The measurement system of reaction force from snow surface that consists of the 6-axis force sensor measures 3-axis force and 3-axis moment vectors from snow surface. The joint angles and joint torques are calculated using the sensor fusion, the inverse kinematics and the inverse dynamics. The lower limb muscle tension is estimated by applying the joint angle, the joint torque and the body segment parameter to the 3D muscle-skeleton model.
The measurement experiment was conducted for the skier gliding on the actual snow field. The motion measurement systems were attached to body segments（lumber, upper thighs and lower thighs）of skier and ski boots. The measurement systems of reaction force were installed to between boots and skis. The results of the motion analysis by the lower limb muscle tension indicated the major muscle activities of the skier gliding on the actual snow field. Therefore, the motion analysis method can be used to development of training and injury prevention methods.
