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The triceps surae consists of two muscles located at the calf – the two-headed gastrocnemius and the soleus.These muscles both insert into the calcaneus, the bone of the heel of the human foot, and form the major part of the muscle of the posterior leg, commonly known as the calf muscle.
The gastrocnemius muscle is prone to spasms, which are painful, involuntary contractions of the muscle that may last several minutes. [5] A severe ankle dorsiflexion force may result in a Medial Gastrocnemius Strain (MGS) injury of the muscle, commonly referred to as a "torn" or "strained" calf muscle, which is acutely painful and disabling. [6]
Soleus muscles have more slow muscle fibers than many other muscles. In some animals, such as the guinea pig and cat, soleus consists of 100% slow muscle fibers. [6] [7] Human soleus fiber composition is variable, containing between 60% and 100% slow fibers. [8] The soleus is the most effective muscle for plantar flexion in a bent knee position.
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It connects the calf muscles to the heel bone of the foot. The calf muscles are the gastrocnemius, soleus and the heel bone is called the calcaneus. It is approximately 15 centimeters (5.9 inches) long and begins near the middle part of the calf. Contraction of the calf muscles flexes the foot down.
Calf raises are a foundational exercise: standing with feet hip-width apart, you raise your heels off the ground and lower them back down, effectively strengthening the gastrocnemius and soleus muscles. Seated calf raises, performed while sitting with a weight on your knees, focus specifically on the soleus muscle, which is crucial for ...
The gastrocnemius/soleus is active in the last part of swing phase to prepare for foot strike and remain active through stance until just before toe-off in order to propel the body forward. The tibialis anterior is active during swing to allow ground clearance and undergoes eccentric lengthening during stance to help control deceleration and ...
If a tensile force is then generated in the Achilles tendon it will increase tensile strain in the plantar fascia. Clinically, this relationship has been used as a basis for treatment for plantar fasciitis, with stretches and night stretch splinting being applied to the gastrocnemius/soleus muscle unit.