Figure 2

Variability in stride velocity. Variability in stride velocity in the normal and dual task walking conditions, as quantified with the coefficient of variation (error bars represent one standard deviation). The difference in variability in stride velocity between the normal and dual task walking conditions is statistically significant [F(1,40) = 20.281, p < 0.001]. The difference in variability in stride velocity between older and younger subjects is statistically significant [F(1,40) = 13.232, p = 0.001].