骨盤の動力学モデルに基づくヒト自然立位時身体動揺の解析

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書誌事項

タイトル別名
  • A Study of Human Body Sway Based on a Dynamic Model of the Pelvis
  • コツバン ノ ドウリキガク モデル ニ モトヅク ヒト シゼン リツイジ シンタイ ドウヨウ ノ カイセキ

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説明

Human's pelvis is an important structure, which links with the upper body and the two legs. The dynamics of pelvis as a key role in postural sway is determined by its' weight, the upper body and the reaction forces of the two legs. The aim of present study is to establish a dynamic pelvis model during the static upright stance, and to describe the mechanism underlying body sway in the frontal section. The dynamic pelvis model includes five joints, i.e. two ankle joints, two hip joints and one lumbosacral joint, all of which make up a multi-link system, and is driven by two pairs of muscles, the psoas major (PM) and gluteus medius (GM). Experiments on eight healthy young subjects showed that, during static upright standing, the angular sway scopes of the ankle joint on roll (medial-lateral) plane are 0.94±0.36°and 1.35±0.52°in eye-open and eye-closed conditions, respectively, while in lumbosacral joint are 0.99±0.41°and 1.27±0.72°. Ankle and lumbosacral joint rotated in almost the same degree, while, their phase difference was near 180 degrees. This means that the trunk is always kept upright during the course of body sway. Surface electromyography (sEMG) recordings from GM showed that the right GM contracted simultaneously in responding with the center of pressure (COP) excursion toward left, and vice versa. By applying body's physical parameters and assuming that the corrective torque of is regulated by PID (proportional, integral and derivative) control to the sway angle, then the body sway can be simulated. The simulation results of body sway were well consistent with experimental records, suggesting that the pelvis is an important structure in posture maintenance, and the dynamical model is useful for posture sway analyzing.

収録刊行物

  • 教育医学

    教育医学 51 (3), 242-252, 2006

    日本教育医学会

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