Abstract
In recent years, the number of senior citizens is increasing and the number of elderlies who complain of backache and arthralgia also tends to increase. This study attempts to comprehend the dynamic behaviors of a human rising from a chair through stand-up experiments using gyro sensors and force plate, and individual differences in rising motion are considered. In addition, authors develop the 2D analytical model and the equation of motion of a rising human and evaluate joint torque during rising performances by inverse analyses. The experimental results showed that standing-up motion changes depending on the chair height in general, but the motion for a particular subject does not depend on the chair height. Moreover, it is found that individual differences in rising motion are large for taller chairs, but not for lower chairs.
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