Originally posted by Sugarj
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None.
I swear to Christ, asking for physiology advice on this board is like going onto a quilting forum and asking how to win a knife fight.
Training methods have nothing to do with muscle gain. Train to failure -- either high reps low weight, or low reps high weight, doesn't matter -- and eat. Period.
High-intensity training causes microscopic tears in the muscle, it doesn't matter how it happens. When those tears heal, they heal thicker with proper nutrition. Eventually you gain muscle size. If you don't eat enough, you will lose muscle tissue through the catabolic process.
That's all there is to it.
There is no "thickening" or "hardening" of the muscles from one type of exercise versus another. The apparent density of a muscle (in a living person) is a product of water and glycogen present in the muscle tissue. It's why bodybuilders carb-load before a show and why creatine makes you look pumped. (And why any boxer whose head isn't up his ass should carb-load, as well; you want your muscles to have peak energy storage and mass -- hence leverage -- before a fight.) But I digress. Again.
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