Evaluation of maximal calf circumference on the basis of ultrasonography and electromyography of the soleus

Abstract

[Purpose] We examined the relationships between maximal calf circumference and histological characteristics of the soleus muscle and the neuromuscular function factor of strength of ankle plantar flexion to confirm the importance of evaluating maximal calf circumference. [Subjects] The subjects were 50 healthy adults with no history of lower limb pathology. [Methods] With calf length as 100%, the maximal calf circumference site was measured at 26% from the lower end of the fibular head. Ultrasonography was used to evaluate the histological characteristics of the soleus muscle and a Biodex dynamometer with EMG was used for other measurements. [Results] A moderately strong correlation was observed among muscle histological characteristics, maximal calf circumference, and ankle plantar flexor force in all subjects. [Conclusion] Our results suggest that histological characteristics of the soleus muscle correlate with maximal calf circumference and strength of ankle plantar flexion. © 2014 by the Society of Physical Therapy Science.