Abstract
The studies of man-machine interfaces are researched in many technical fields. To create mathematical human model helps to grasp the human functions which can not be measured in living human body. In this study, the mathematical model of human lower extremity is built up as a part of research to evaluate the functions of human exercise. Muscles perform important roles in human exercise. Therefore the first, we focused on the isokinetic exercise for knee extension and flexion, and measure electromyograms of each muscle on femur and tibia to identify the agonist. The next, the human lower extremity model are built up by using multibody program which simulate the gross motion of systems of bodies connected by kinematical joints. In this multibody analysis, muscular systems which based on Hill's characteristic equation generate the knee extension and flexion with muscular contraction by considering voluntary muscle contraction, that is, active state of muscle. Finally, the validity of this human lower extremity model is discussed by comparing with experimental torque.
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