This study investigated the evaluation parameters and sex differences of dynamic postural control ability in tracking motion on an unstable surface for middle-aged or older people. The participants were stable when standing on an unstable surface, and they adjust the unstable tilt board to the target angles (forward and backward). The evaluation parameters of time are Reach Time (RT), Adjustment Time (AT) and Complete Time (CT), the evaluation parameters of error are Reach Error (RE), Adjustment Error (AE) and Complete Error (CE). As a result, there was a significant correlation between CT and AT, and AT and AE for both men and women in the forward and backward conditions. Therefore, it was suggested that the ability to accurately adjust the tilt angle to the target angles may be more useful evaluation parameters in the tracking motion on an unstable surface.
