P2-5-09. Effect of transcranial direct current electrical stimulation on supplementary motor cortex on control of balance in healthy subjects

Abstract

Use of transcranial direct current electrical stimulation (tDCS) in rehabilitation has been reported, but few on the effects of tDCS on posture and balance. Our objective was to clarify the influence of tDCS of the supplementary motor area (SMA) on balance in healthy people. Eight healthy adults (4 males, 4 females, mean age 25 yrs) who gave informed consent were enrolled. For tDCS, the anode was attached by tape to the scalp above the SMA, likewise and the cathode was placed at the external occipital protuberance., and Stimulation at intensity of 1 mA was applied for 20 min. The same procedure without stimulation was followed for sham stimulation. Before and after stimulation subjects performed raising of upper limbs while standing, and maintaining a single leg standing position, on a stabilometer. Items evaluated were shortening of the total trajectory length of the center of gravity movement during and after raising the upper limbs before and after the stimulation, and shortening of the total trajectory length of the center of gravity movement during maintaining the single posture. It is thought that tDCS anodic stimulation of the SMA promoted the posture adjustment function of SMA and contributed to a decrease in center of gravity fluctuation.