Fig. 4.

Power declines with age. a EDL. b Linear regression of EDL power at 60 % P ₀. See Fig. S3 in the supplement for the other regressions. c SOL. d Linear regression of SOL power at 80 % P ₀. See Fig. S4 in the supplement for the other regressions. See Table 1 and text for post hoc analysis. Each symbol in b and d in the regression graphs represents a measurement from an individual mouse at the given age. Equation: simple linear regression of power (y) as a function of age (x). *p < 0.05, p value from one-way ANOVA. mN fl/s millinewtons multiplied by fiber lengths per second, % P ₀ percentage of maximum isometric force, Age age in months