Fig. 7.

Mean change in lattice spacing from start of shortening to end of shortening with 95% confidence of the mean for muscles 178 (left) and 179 (right) during passive and active work loops. We found that strain greatly affected lattice spacing for muscle 179 (P<0.001), but not for muscle 178 (P=0.43). In contrast, we found activation greatly affected muscle 178 (P=0.007) but did not significantly affect muscle 179 (P=0.24). Statistics were calculated by two-factor ANOVA (strain and activation). See Fig. 6 for sample sizes.