*3.4. Regularity Index: Effect of Locomotor Strategy*

The only test able to explore the effect of a different locomotor strategy was the comparison between the regularity indexes of W3 and R3, i.e., walking and running at the same velocity (1.8 m/s). This was the only feasible comparison, since healthy subjects can switch between walking and running without forcing themselves into a narrow range of speeds. No significant differences emerged from the Wilcoxon test, though a perusal of data distributions showed occasionally lower regularity in walking trials (see Figure 4C).
