Which muscle is called the Peripheral hea of body?

In an upright posture, the soleus is responsible for pumping venous blood back into the hea from the periphery and is often called the skeletal-muscle pump, peripheral hea or the sural (tricipital) pump. Soleus muscles have a higher propoion of slow muscle fibers than many other musclesReference: Chaurasia Volume II; 7th edition; Page no: 116