Fig. 5.

Skeletal muscle paired box 7 (Pax7)+ (satellite) cells in young and older adults before and after exercise-induced skeletal muscle injury. Dashed line represents value for young adults; solid line represents value for older adults. Symbols represent means adjusted for gender, physical activity (steps/day), and baseline measure of the outcome; error bars represent SE. A significant main effect was observed for time (P = 0.002), but the age × time interaction was not significant (P = 0.857). Right: representative muscle cross-section stained for DAPI (blue) and Pax7 (green) to identify muscle satellite cells.