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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]
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If a weight is used, then it rests upon the shoulders, or is held in the hand(s). This is an isolation exercise for the calves; it particularly emphasises the gastrocnemius muscle, and recruits the soleus muscle. [6] Equipment Body weight, dumbbells, barbell, Smith machine or standing calf raise machine. Major variants
The exercise is performed by raising the heel as far as possible. Weights or other methods of providing resistance are commonly used, but the exercise is also effective with bodyweight alone. [2] Balance may become a difficulty with free-standing calf raises, especially with older one-legged variations.
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The superficial portion (the gastrocnemius) gives off two heads attaching to the base of the femur directly above the knee. The deep (profundus) mass of muscle (the soleus) forms the remaining head which attaches to the superior posterior area of the tibia. The triceps surae is innervated by the tibial nerve, specifically, nerve roots L5–S2.
The squat is a large muscle-mass resistance exercise. [35] As such, squats produce acute increases in testosterone (especially in men) and growth hormone (especially in women). [35] Although insulin-like growth factor 1 (IGF-1) is not raised acutely by squat exercise, resistance-trained men and women have higher resting IGF-1. [35]