Fig. 3

Relationships between postural sway complexity, standing foot sole vibration threshold, and mobility (i.e., timed up-and-go (TUG) time). Scatterplots reflect outcomes acquired during the “baseline” study visit in which no foot sole vibrations were present. Postural sway complexity values were computed from anterioposterior (AP) and mediolateral (ML) center-of-pressure time-series obtained during eyes-open standing. Data from each of the three within-day testing sessions have been included (see Legends). Participants with greater ML postural sway complexity exhibited lower (i.e., more sensitive) foot sole vibratory thresholds, as well as better mobility (i.e., lower TUG times) (a and c). Within-day testing session did not significantly influence the strength of these correlations. In contrast, neither AP sway complexity (b and d), nor the traditional measures of sway speed or area (not pictured), were correlated with foot sole somatosensation or mobility