Pelvis support unit is coupled to the base by an electric normal force actuator mechanism. Torso support unit attached to the patient independently of the pelvic support unit is connected to the base by an electric one or more joints operable about an axis of motion of each. Sensor detects the angular displacement of the linear and torso support unit and pelvis support unit. The control unit is coupled to these sensors, in response to signals from these sensors, and selectively controlling the displacement of the joint and the actuator. For the wheel module, the power is supplied independently to the steering and rotated, they can be in response to the control unit and to roll the exercise device in the direction of travel intended by the patient.
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