Hmmm, I've been wondering this myself. A couple week ago one of my sparring partners puked and he asked our trainer if that was "ok". My trainer responded with "if you're not puking, you're not working hard enough." I don't think he was serious, but it led me to wonder exaclty what it is that causes someone to throw up.
The lactic acid buildup could be one, but how does that effect your stomach/bile duct? Is it the strain on the CNS and maybe something to do with blood flow, or rather the lack of it?
I really hope someone know the answer to this.
EDIT:
OK I just googles "puking exercise" and this was the FIRST thing that came up:
Quote:
The Gastrointestinal System and Exercise
It's well established that intense exercise (e.g., >85% VO2 max) shunts blood away from the GI tract and slows down digestion and absorption. However, at exercise intensities that ultra cyclists use, digestion is not impaired, provided hydration is maintained.
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from Ultracycling
They were more concerned with 2 hours + endurance type training, but a good start anyhow.