But there are other scientific reasons to conclude that this range is optimal for muscle growth.
A compound-only routine is incapable of recruiting all muscle fibers in all muscles and therefore cannot produce muscle growth at optimal levels.
In contrast to the systemic hormone theory of muscle growth, there is the fact of LOCAL muscle growth stimulation i.e.
muscle growth takes place in the muscle being DIRECTLY worked.
That a systemic release in anabolic hormones doesn’t enhance muscle growth was shown in this study [12] and is covered quite well in an article called ‘The Fall of the Greatest Theory of Muscle Growth‘ over at the Exercise Biology site.

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