Study on computer-aided dynamic motion analysis and influence of aging in stand and sit motion

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  • コンピュータを応用した起立・着席動作の解析と加齢の影響に関する研究
  • コンピュータ オ オウヨウシタ キリツ チャクセキ ドウサ ノ カイセキ ト

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Abstract

A sequence of motions consisting of standing up from a chair and sitting down again to the chair are analyzed from kinematic viewpoints and the influences of aging on the motions are discussed. A 16mm movie camera is employed to take the pictures of the body motions, and the necessary information is fed into a minicomputer with use of a graphic tablet so that forces and torques acting at body joints are computed based on a two-dimensional mathematic model of human body.<br>Experiments were carried out by nineteen male subjects from 22 years old to 80 years old. The results of the detailed analyses of the motion patterns and the estimated torques at important body joints indicate that the smoothness of the motion is reduced with an increase of age due to lack of close coordinations in motions among different joints. The torque acting at the hip joint is reduced with aging, and it is drastically reduced by supporting body by putting hands on the frontal table during the motions.

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