For some reason people seem to think that you can somehow "choose" your energy pathway.
Surely our anatomy is the same, but our reactions to a multiplicity of variables are much different, one from the other.
Your body will always use a combination of energy pathways, not just one. Much is dependent on what kind of energy it has a surplus of, and also what you have taught it (homeostasis) to do over a period of time.
If muscle burns energy while working and while at rest, why not spend your time in MHR and build as much muscle as possible? If "aerobics" which uses oxygen exclusively burns mostly fat, how would you expect this to happen while your largest muscle groups are operating on carbohydrate and "anaerobically" (without oxygen)??
If lactic acid is built up and truly is NOT a waste by-product and is in fact used again as an energy source, why not continue to work closer to MHR?
"Cardio" is also a misnomer. You can go in and out of many energy pathways during exercise and the only folks who are TRULY operating "aerobically" are going to be the ones that are always standing around talking.
I obviously don't buy into the whole Aerobic Exercise thingy.
I say: create a caloric deficit by educating yourself on nutrients, how AND WHEN they are utilized. Then, decide if you want to be a *thin-fatty* or a bodybuilder.
Does anyone here actually understand why victims of concentration camps (supposedly) died of starvation? Is this even possible? If so, why?
And while youre' at it, would a concentration camp victim have more fat on him/her than an aerobic freak, or less? How about a competition "ready" bodybuilder? More ~ or ~ less fat? And why?
Energy pathways are much too complicated to understand just by reading about them.