Figure 1: Schematic representation of the three motor tasks – a) reactive balance (RB), b) limits of stability in the forward direction, c) gait. For the RB, subjects experienced a trip-like perturbation that evoked a compensatory stepping response. The center of mass position relative to base of support (XCOM/BOS) was recoded at compensatory step touchdown. During the gait task subjects walked on the GaitRite mat at preferred walking speed and the velocity was measured. The limits of stability (intentional balance task) required subjects to lean forward upon hearing an auditory cue. The maximum center of pressure (COP) excursion from the resting position (MXE) was recorded.