In agreement, Reid et al. (2011) compared eccentric plantar flexion with the knee fully extended and during a flexed position and reported superior gastrocnemius muscle activity during plantar flexion with full knee extension and no difference in soleus muscle activity. (strengthandconditioningresearch.com)
Interestingly, the single - fiber area histogram of soleus muscles from IL - 15Rα — KO mice was not different from control, demonstrating a specific effect of IL - 15Rα knockout on fast muscle morphology. (jci.org)
These are the quadriceps, which are located at the front of the thigh and consist of four separate muscles — the vastus lateralis, vastus medialis, vastus intermedius and rectus femoris; the hamstrings, which are located at the back of the thigh and consist of the biceps femoris, semitendinosus and semimembranosus; and the calves, which consist of the large two - headed gastrocnemius muscle and the much smaller soleus muscle which lies underneath the gastrocnemius. (whatreallybuildsmuscle.com)