Changes in fatigue envelopes of Dex treated 10-12 month old male rats (n = 12). The fatigability test, performed before treating with Dex showed no differences in muscle force (inset). After 11 days of treatment, the Dex treated rats showed a significantly reduced force plateau (fatigue envelopes from both legs were recorded). Twelve rats from each treatment group were tested and the force generation of their left and right legs were recorded independently (i.e. n = 24 data sets/group).