There is a theory among bodybuilders, that is, if you train big muscle groups (e.g. legs, chest), it will increase the overall growth of muscles all over the body; the trained muscle will release signals (what are they?) into the blood stream and in turn, triggers the release of muscle growth/repair hormones (insulin-like growth factor?) which have effects on any (skeleton) muscle cells.

  • Is this story true?
  • Will the muscle growth/repair hormones also enhance the smooth muscle or cardiac muscle?
  • $\begingroup$ Definitely a question that should be asked on bodybuilding.SE. $\endgroup$
    – Remi.b
    Jan 8 '16 at 7:33
  • 1
    $\begingroup$ @Remi.b, the OP is interested in knowing if the popular notion amongst bodybuilders has some authentic biological basis. $\endgroup$
    Jan 8 '16 at 9:31
  • $\begingroup$ Maybe I am wrong but I would assume that on bodybuilding.SE they care about verifying their claims. $\endgroup$
    – Remi.b
    Jan 8 '16 at 16:09
  • $\begingroup$ @Remi.b thank you for the link. But I just want to find out whether these popular claims are supported by rigorous study. I looked at some references cited by bodybuilding experts, they are pretty crappy. $\endgroup$
    – Machine
    Jan 8 '16 at 19:20
  • $\begingroup$ jap.physiology.org/content/65/6/2406 here is a paper on training and increase in testosterone. $\endgroup$
    – Machine
    Jan 8 '16 at 20:36

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