Quinn believes gastric spasm in such athletes is caused by a build-up of lactic acid in the bloodstream, which is then expelled through vomiting.
"Cousins is getting to a point where the lactic accumulation in the blood is so high it is starting to become debilitating," Quinn said.
"Your body automatically wants to break that down. One way of doing that is to keep moving - even at a slow jog. A more efficient way in many respects is to throw it up.
"Cousins is getting to a point where the lactic accumulation in the blood is so high it is starting to become debilitating," Quinn said.
"Your body automatically wants to break that down. One way of doing that is to keep moving - even at a slow jog. A more efficient way in many respects is to throw it up.

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