Figure 3. A. Peak isometric force during eccentric exercise of soleus muscle from young mice of both sexes and adult female mice. B. Creatine kinase (CK) efflux from soleus muscle in young mice of both sexes and adult females in the control experiment and after eccentric exercise. Data are shown as means and SD. * p < 0.05, ** p < 0.01, *** p < 0.001 young males compared to young females; # p < 0.05, ### p < 0.001 young males and young females compared to adult females.