Abstract
The purpose of this study is to establish a screening method of persons who have a possibility of falling accidents, and establish a training method to prevent falling accidents. We measured the changes of postural balance by using a gravicorder when the vibratory stimulations of 30, 60 or 200Hz are applied to paraspinal muscle or gastrocnemius muscle of healthy young males. When the vibratory stimulations of 30 or 60Hz are applied to gastrocnemius muscle, the COP (Center of Pressure)s shifted posteriorly. However, when applied 200Hz vibratory stimulations are applied to gastrocnemius muscle or 30, 60 or 200Hz vibratory stimulations to paraspinal muscle, the changes of postural balance were not observed.