Fig. 4. Force–velocity (F-V) and force–power (F-P) relationships of pre- and post-flight soleus fibers from subject B of the 17-day STS-78 shuttle flight. Continuous lines represent composite pre-flight force–velocity and force–power relationships. Broken lines represent post-flight force–velocity and force–power relationships (redrawn from)(Widrick et al., 1999). FL, fiber length.