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Anonymous
>>73481
If you're mentioning specific 'variables' studied, I'm assuming you know the source for this. What is it?
Your definition of 'mass' and 'volume' sounds like original research. It's generally a bad idea to start coining neologisms in the middle of a discussion, if for no other reason than it's confounding to people who aren't inside your head. Are you talking about the simple superficial appearance, or are you talking about muscle fiber type and density? In either case, it's still a moot point, because you aren't suddenly going to start losing muscle because you're burning a lot of calories, as long as you're eating well enough. I do agree that adequate nutrient timing is very important though, and yes, if your last meal was in the early evening and you're doing cardio 12 hours later, your recovery will suffer and you may not get the same gains you would have normally because the protein synthesis is interrupted. But you aren't going to lose muscle mass while doing the cardio, because fat is the preferred fuel when glycogen is depleted, except under special circumstances.
I will add one important thing I think my original post was lacking, though. Your body type is also very important. The likelihood of your body breaking down existing muscle tissue throughout the rest of the day (i.e. after morning fasted cardio) is greatly dependent on your meso-type as well as diet. Endomorphs and mesomorphs are more likely to burn fat, while ectomorphs are probably more likely to burn muscle.
So maybe the tl;dr of this all is that if you're a skinny bastard, don't do morning fasted cardio to get your abs and serratus showing, but if you're a lard-ass Fatlus type, go for it.
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