其他摘要：Electromyograms were recorded during elevation of the lower extremity in the various vertical planes, from 11 muscles participating in the movements. The recordings obtained were examined in terms of the functional mechanism of the muscles. The results obtained are summarized as follows: 1) The anterior portion of the gluteus medius acts as an elevator at any vertical planes except only initial part of the movement in the sagittal plane. 2) The posterior portion of the gluteus medius acts as an elevator in the vertical planes between 60 degree and 150 degree lateral from the sagittal plane. When the movement was performed against the disturbing force including a slight lateralward horizontal component, the discharge was observed in the vertical plane from 0 degree up to 180 degree. Conversely, when the movement was performed against the medialward disturbing force, the discharge was observed from 90 degree up to 135 degree lateral from the sagittal plane. 3) The sartorius and the rectus femoris act as elevators between the sagittal plane and the frontal plane. Since they have a component of adduction as they were elevated in the vertical planes between 30 and 90 degree lateral from the sagittal plane, the increase in the discharge was observed when the movement performed against the lateralward disturbing force rather than that against medialward. 4) The adductor longus participates for elevation of the thigh in the vertical planes between the sagittal and 60 degree lateral vertical plane. 5) The tensor fasciae latae actively participates for elevation of the thigh in any vertical plane up to 120 degree lateral vertical plane. 6) The discharges of the gracilis were not observed in any vertical plane. 7) The semimembranosus and the biceps femoris participate for the thigh elevation in any vertical plane beyond 105 degree and 150 degree lateral from the sagittal plane respectively. Since the muscles have a component of adduction in the movement, the increase of the discharge was observed when the movement was performed against the lateralward disturbing force. 8) The adductor magnus acts as an elevator in any vertical plane beyond 135 degree lateral vertical plane.
