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This paper proposes a system MAS (muscle assistant system), which controls designated muscle forces by controlling a power-assisting device. MAS estimates muscle force based on posture measured by a motion capture system. The feasibility of the muscle force control for an object muscle is checked based on constrained optimization problem. For realizing the target force, the driving-force of power-assisting device is calculated and controlled. Using this pin-pointed muscle force control method, the effective rehabilitation and sports training is provided.