Fig. 4

Comparison between relative change in oxygenated hemoglobin (HbO₂) levels during walking (W) and walking while talking (WT) tasks in no body weight support (NBWS) and partial body weight support (PBWS) conditions in older adults with multiple sclerosis (MS) and healthy older adults (HOA). The relative change in HbO₂ levels was examined using the change from the first to the last 10 s throughout the course of each 30 s trial (i.e., relative change in HbO₂ levels = average HbO₂ value from the last 10 s minus the average from the first 10 s). A significant interaction between task, BWS, and cohort across time (p-value < .001) was exhibited from the Hochberg’s post-hoc tests