i have done it both ways, but i don't think "empty stomach cardio" is a very descritive term, a much better one would be "glycogen depleted cardio" or just cardio in a glycogen depleted state as that's more accurate
my logic behind taking things before cardio is thus, the things i am taking do one of two things: they either help the body promote fat oxidation or create an amino acid rich state in the blood and fill the amino acid pool
the reason for this is simple, if the amino acids are used for energy instead of fat, then that means that if they weren't there i would be using muscle instead, and i would prefer to burn through the aminos i ingest before cardio then the muscle i work so hard so put on
a certain percentage of energy during glycogen depleted cardio is going to come from gluconeogenesis, and though we try to keep that percentage as low as possible, it's still there, so i would prefer to burn through aminos that i ingest instead of ones that i build
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