立位における一側上肢での身体側面に沿った下方リーチ肢位保持についての運動学的検討

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  • Kinematic study of downward reach from the standing position while holding one limb along the side of the body
  • リツイ ニ オケル イチソク ジョウシ デ ノ シンタイ ソクメン ニ ソッタ カホウ リーチシイ ホジ ニ ツイテ ノ ウンドウガクテキ ケントウ

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<p>We examined the joint angles of the trunk, hips, and feet of 16 healthy adult male subjects while they performed downward reach position from the standing position while holding one arm along the side of the body. The postural change at the time of reach was recorded from the rear with a digital video camera. ImageJ was then used to process the captured images. The thoracic spine lateral flexion angle, thoracolumbar transitional lateral flexion angle, lumbar spine lateral flexion angle, hip adduction/abduction angle, foot pronation/supination angle, pelvic lateral tilt angle, crus tilt angle, and calcaneal tilt angle were used to determine the change in posture. In the downward reach, lateral flexion mainly occurred on the reach side of the trunk. The images revealed that hip abduction on the reach side and reach inclination of the pelvis occurred at the beginning and at the end of the movement. Therefore, downward reach mainly involves lateral flexion of the trunk. Furthermore, the reach-side inclination of the trunk due to the lateral flexion of the trunk and hip abduction on the reach side is a movement in which the center of gravity of the body tends to deviate to the reach side. Therefore, we consider that the center of gravity of the body is kept on the base of support by the non-reach side movement of the pelvis and the non-reach side inclination of the lower limbs using hip abduction on the reach side and hip adduction on the non-reach side.</p>

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