Fig. 6. Sustained force is compared between males and females in the three muscles (FCR, AIL, ECU). Sustained force was averaged over 30 s intervals and expressed as a percentage of the average peak force for the same time interval. In both FCR and AIL, males produced significantly more sustained force than did females; however, in AIL significance was reached only at the 240 s time interval. Male and female ECU both produced equally small amounts of sustained force (note the different force scale). Asterisks indicate significant differences (P<0.05, adjusted with sequential Bonferroni; k=8). Values are means ± s.e.m.