Soleus and gastrocnemius are active during most of stance except which portion?

Soleus and gastrocnemius are active during most of stance except which portion?

• A. First 10%
• B. Last 10%
• C. Midstance only
• D. Terminal stance only

Answer: (A)

The key idea is how the calf muscles behave across the stance phase of gait. The soleus and gastrocnemius act as the main plantarflexors, controlling the forward progression of the tibia and generating push-off from midstance through terminal stance. They are active for most of stance to help absorb load and then propel the body forward. However, at the very start of stance—the first portion after heel contact—the plantarflexors are not active. This initial moment is dominated by weight acceptance and shock absorption, with other muscles (such as dorsiflexors and knee/hip stabilizers) handling the early control. That’s why they’re not engaged for the first 10% of stance, making that the best answer. The other options imply activity windows that don’t fit the general pattern: these muscles contribute well into midstance and continue through terminal stance, not just during a single later phase or only midstance.

The key idea is how the calf muscles behave across the stance phase of gait. The soleus and gastrocnemius act as the main plantarflexors, controlling the forward progression of the tibia and generating push-off from midstance through terminal stance. They are active for most of stance to help absorb load and then propel the body forward.

However, at the very start of stance—the first portion after heel contact—the plantarflexors are not active. This initial moment is dominated by weight acceptance and shock absorption, with other muscles (such as dorsiflexors and knee/hip stabilizers) handling the early control. That’s why they’re not engaged for the first 10% of stance, making that the best answer.

The other options imply activity windows that don’t fit the general pattern: these muscles contribute well into midstance and continue through terminal stance, not just during a single later phase or only midstance.