Figure 2.

Histogram of the passive tension in the fibers (pale color) and in the bundles (dark color) at different sarcomere lengths for the young (blue) and elderly (red) subjects. Post-hoc comparisons of ANOVA are shown. * p < 0.05, statistical difference between fibers and bundles in the same age group. # p < 0.05, statistical difference of bundles between age groups. Data are shown as mean value +/- SEM. Note that the difference between fibers of young and elderly subjects does not reach statistical significance at any sarcomere length.