In the gastroc-soleus complex, which zone is most likely to experience overcorrection?

• A. Zone I
• B. Zone II
• C. Zone IV
• D. Zone III

Answer: (D)

The key idea is that lengthening the gastrocnemius-soleus complex can overshoot if the release is made in a segment that contributes a large amount of length with relatively little resistance. Zone three represents the portion of the gastroc-soleus where the aponeurotic/fascial elements predominate and the length change translates more directly into ankle dorsiflexion. Because this zone is more elastic and provides less resistive force compared with other parts (like the muscular belly or dense tendon near insertion), a release here can produce a larger-than-intended increase in dorsiflexion, leading to overcorrection. Therefore, this region is most likely to experience overcorrection.