Each participant from both groups performed eight balance tests (BALT's) which alter or cancel, individually or combined, sensory input from the sensory systems involved in postural control. The order of the tests was changed systematically between subjects; therefore, they did not perform the tests in the same order to eliminate external factors such as fatigue or accommodation to the BALT's, which could alter the results. The BALT's were conducted on the (TekScan, Boston, MA) a pressure platform containing sensors that measure a displacement of the center of pressure in centimeters squared (cm2) (CoP), anteroposterior (AP), and mediolateral (ML) sway in centimeters (cm). The data collected from the pressure mat was analyzed with Sway Analysis Module (SAM) software designed for this purpose. The subjects stood for 30 seconds on the pressure platform during each test.