Using a force plate and electromyographic recordings, changes in the muscle activity of the lower extremities during forward-inclining-posture walking and the free walking of healthy young adults were studied and compared with the free gait of healthy geriatrics. The movement of the hamstring, and the tibialis anterior and calf muscles caused a negative quadric curve during the forward-inclining gait and a positive curve during the free walking. However, the movements of the rectus femoris muscle caused a positive curve during the forward-inclining gait and a negative curve during the free walking.
It also was found that geriatrics are thrown off balance by changes in cadence while walking. Further, greater muscular activity of the lower extremities is needed by geriatrics than by young adults during free walking, and the muscular movements of geriatrics during free walking showed no relation to the forwardinclining muscular movements of the young adults.