Quote:
Originally posted by Nazggul
What I think you are referring to, and correctly but just with the wrong name, is the Anaerobic Threashold (AT). Basically the point at which your body switches from burning Carbohydrates/Fats to burning Proteins which are harder for the body to consume.
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Not entirely accurate there, the AT is when the body doesn't have enough Oxygen to burn carbs through the full cycle that it usually would, and switches to a partial cycle that makes energy without the oxygen requirement. The result is lactic acid buildup, which is what causes muscle cramps and the like when you've worked them out to hard, and consequently what causes chest pain if you are having angina or a heart attack.