Fig. 2. Force/frequency curves compare the amount of force (as a percentage of maximal force) produced at varying stimulus rates for male and female muscles (FCR, AIL, ECU) over a train duration of 670 ms. Stimulus frequencies ranged from 5 to 80 pulses s^-1. No significant differences were found between sexes for a given muscle. Values are means ± s.e.m. Sample sizes for these and subsequent figures comparing male and female muscles are shown in Table 1.