**3.2 Static and dynamic arch indices**

The SSCO condition resulted in a slightly smaller increase in static arch index for the left foot compared to CTRL, and in a slight decrease in static and dynamic arch indices for the right foot (**Figure 2**). A strong variability was observed among subjects (i.e. large standard error) and none of the arch index results reached statistical significance (P-values >0.05, **Table 3**).


#### **Table 2.**

*Mean absolute gain in perceived muscle fatigue (i.e. difference between baseline and post-intervention mean intensity of perceived muscle fatigue) and impact of each insole condition with respect to foot fatigue perception (N = 21).*

#### **Figure 2.**

*Mean relative change in static (left) and dynamic (right) arch index from baseline to post-intervention. The error bars represent the standard error resulting from the data of all fatigued subjects (N = 21).*
