Figure 4.

Change in tissue oxygenation index (TOI) relative to walking in normal shoes for left (L) and right (R) prefrontal cortex. When walking with textured insoles, TOI was reduced for both treadmill and overground walking. When walking with no shoes, TOI was reduced during treadmill walking but not overground walking. Dual-tasking increased TOI for overground but not treadmill walking. For each bar, group means are indicated by the bold central lines, and 95% confidence intervals are indicated by the upper and lower margins.