The Effects of Scale Display of Visual Feedback on Postural Control During Quiet Standing in Healthy Elderly Subjects

Mean and SD values for (A) the surface area covered by the trajectory of the foot COP and the variances of COP displacements along (B) the ML and (C) AP axes obtained in the eyes open (EO) condition and the 3 VFB conditions involving increasing scale displays (VFB₂, VFB₅, VFB₁₀). These latter conditions correspond to the ratio between the real displacements of the COP, as measured by the force platform, and their visualization on the monitor screen. Legend: eyes-open condition, white bars; VFB₂ condition, black bars; VFB₅ condition, gray bars; VFB₁₀ condition, hatched bars. Significant P values for comparisons with the eyes open condition (P>.05 not significant [NS]; *P<.05; †P<.01; ‡P<.001).