Figure 3

Anterior-posterior responses of the COM. Top: COM in the AP plane plotted over time for a single subject during the eyes closed (left) and the pitch up visual field (right) conditions in quiet stance (black line) and when performing mental calculation (grey line). Bottom: Average RMS (left) and ApEn (right) of the COM responses with standard error bars across all subjects in the AP plane. =Significant main effects (p < 0.05) between pre-and post-vibration responses; ** = Significant differences (p < 0.05) between trial periods; * = Significant differences (p < 0.05) between pitch up rotation and eyes closed responses.