Group mean (standard deviation) calcaneal (i.e., Achilles) tendon moment arms from isometric contractions across the range of ankle angles tested. From each contraction, we extracted (A) the resting value, (B) the value at peak ankle moment, and (C) the change from rest to peak ankle moment. Repeated measures ANOVA main effects of ankle angle shown, with significant (p<0.05) pairwise comparisons designated by asterisks (*). Gray circles indicate individual subject data for each condition and outcome measure.