May I know if there have been journal article reviews or studies that deal with how the body decides where to build or breakdown muscle first, and the metabolic/endocrinal/molecular mechanisms behind this? Hmmm this might be a trivial issue, like it might be quite obvious that if you train the deltoids, then the deltoids will grow, and not some other muscle. But I'd like to know if this issue has been investigated scientifically. I cannot seem to find any journal articles on this, mayb I am searching with the wrong terms.
The ultimate goal of course is to use this scientific knowledge to control where the body builds and breakdown muscles to achieve certain aesthetic/fitness aims.