Changes in fatigue envelope parameters of Dex treated 10-12 month old male rats (n = 12). Dex treated rats show reductions in all fatigue envelope parameters, e.g. 25%, 20%, 15%, 50%, and 45% reductions of Fmax, Fmin, half fatigue time (T50), slopeT50, and F AUCT50, respectively. Error bars indicate mean ± SEM. P values are given compared to placebo treated rats.