Fig. 4.
Velocity and power empirical distributions. The box plots indicate the median and the 25th and 75th quartiles. The dashed vertical lines that originate from the top and bottom surfaces of the boxes extend to the outermost data points that fall within 1.5× the difference between the 75th and 25th quartiles. Unshaded boxes correspond to values from fibers obtained before the subjects undertook the PRT; shaded boxes correspond to values from fibers obtained after training. The number of fibers in each group is indicated at the bottom of the topmost panels. Note that, with the exception of a/Fo, the vertical scales on the plots for type 2 fibers differ from the vertical scales on the plots for type 1 fibers. Also note that the fibers that contributed to the data shown in Fig. 4 are, for most groupings, a subset of the fibers that contributed to the data shown in Fig. 3, because not all fibers survived the rigorous force-velocity experimental protocol. Data from the low-velocity and high-velocity PRT groups are combined in these plots. Results of the statistical analyses of main effects appear in Figs. 5 and Fig. 6. Pmax, peak power; nPmax, normalized peak power.