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IGF-1, testosterone and (GH) human growth hormone are hormones to play a effective role in muscle devoplment and growth



Bodybuilders of early  times used to train with short rest periods between sets as less rest  with intense training leads to increases in GH(human growth hormone) and testosterone.

Earlier people used to feel that testosterone increases muscle mass as it stimulates fractional muscle protein synthesis added to it was increase in muscle anabolism associates  with increase in expression of mRNA IGF-I . Now we will discuss some Testosterone effects of muscle mass in body :