Figure 1. MPF slopes ( M ± SD) across trials. Repeated measures ANOVAs showed that for MPF normalized to MVC (F_2,40 = 0.73, p=0.48), the mean (F_2,40 = 1.16, p=0.32), and the y-intercept (F_2,40 = 0.99, p=0.38), there were no systematic differences across trials.