Abstract
The rehabilitation effect is judged by Physical therapist and sometimes the judgment of rehabilitation effect are different because his/hers judge standard is different. One of the differences is the posture of the subject. Therefore, in this paper we have subjects move the lower limbs using the instrument and we measured an electromyogram (EMG) of the lower limbs and the angle of the knee as a parameter of the height of the chair a subject sit seats. As the results, it was found that the sitting position is important when an EMG is measured to judge the ability of the lower limbs.
