Pumping Iron Stimulates Muscle-Building Hormones

NEW YORK (Reuters Health) - In men, young and old, strength training boosts levels of testosterone, growth hormone, and cortisol -- hormones associated with enhanced muscle mass and function, a study shows. "These hormonal responses may create an optimal environment for the metabolic process leading to improved muscular function following a strength endurance program," write researchers from Greece in the International Journal of Sports Medicine.

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