Passive Mechanical Properties of Human Medial Gastrocnemius and Soleus Musculotendinous Unit

Figure 4

(a) In vivo estimated tendon force-length relationship of medial gastrocnemius and soleus aspects of the Achilles tendon for one typical participant. Experimental data (dotted line) was fitted using a third-polynomial function and illustrated in a solid black line. The slope of the fitted tendon force-length curve between 20% and 80% of maximal tendon force was defined as the tendon stiffness (dashed line). (b) In vivo estimated tendon stress-strain relationship of medial gastrocnemius and soleus aspect of the Achilles tendon for one typical participant. Experimental data (dotted line) was fitted using a third-polynomial function (solid line).

(a)

(b)