[O-KS-09-2] Effect of galvanic vestibular stimulation in dynamic standing balance
キーワード：galvanic vestibular stimulation, dynamic standing balance, center of pressure
【Purpose】The purpose of present study was to examine the effects of GVS on dynamic standing balance by assessing the center of pressure（CoP）.【Methods】This study adopted an experimental, controlled, single blind, crossover design. Participants were 9 young healthy adults（mean age of 21.67±0.87）, and took part in two conditions that were bipolar GVS（left anode/right cathode, 3mA, 5min）and sham GVS condition. In both conditions, we assessed static balance in upright with their eyes opened（EO）and closed（EC）, and dynamic balance in peak lateral displacement position with EO at before and after application using a force platform（sampling rate=50Hz, measurement time =30sec.）. Main outcomes were configured the total trajectory length（LNG）, the deviation of CoP on the X axis（DEV OF XO）. To examine whether GVS affect static and dynamic standing balance, amount of change（post-pre）in each outcome was calculated and compared between conditions using paierd t-test. SPSS Statistics 23.0 was used at a significant level of 5%. These experiments were approved by the local ethic research committee at Tokyo Metropolitan University. All participants had the experiments explained to them and signed the letter of consent.【Results】There was no significant difference in amount of change in static standing balance in DEV OF XO between conditions. In dynamic standing balance, however, there was significant difference in amount of change in DEV OF XO in peak right displacement position（DEV OF XO-right）between conditions. The mean amount of change in DEV OF XO-right（cm）with GVS was 0.16±0.37, with sham was -0.28±0.50.【Discussion】Our results indicated that GVS has no effect on static standing balance, but facilitates the deviation of CoP toward right. It is possible that GVS changed the vestibular sensation as if be inclined to the left.