抄録
This study was to examine the optimum height of chair for standing up operation and to inspect the shake of the center of sole pressure and the characteristics of EMG during the standing movement. Standing movements performed at the height of seating posture (hip, knee and ankle joint were 90 degree), and at he height of ±2%, ±4% and ±6% of the seating posture. The center of sole pressure was measured by a force-plate and the EMG's of the muscles of lower limb were measured. The shake of the center of sole pressure was larger at higher sitting height, on the other hand, the EMG activity was larger at lower sitting height. The large shake of the center of sole pressure means the large transfer of center of Gravity, consequently the posture of standing up operation from high chair decreased the load of lower limbs.
