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Several biological factors such as age and nutrition can affect muscle hypertrophy. During puberty in males, hypertrophy occurs at an increased rate. Natural hypertrophy normally stops at full growth in the late teens. Muscular hypertrophy can be increased through anabolic steroids, strength training and other short duration, high intensity anaerobic exercises. Lower intensity, longer duration aerobic exercise generally does not result in tissue hypertrophy, instead causing greater storage of fats and carbohydrates within the muscles,[1] as well as neovascularization.[2][3] Though an adequate supply of amino acids is essential to produce muscle hypertrophy and the consumption of carbohydrates and amino acids can transiently increase anabolism within muscle cells, it is not known if consuming protein immediately after exercising can result in long-term increases in muscle size.[4]
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