Originally Posted by dyna mo

did a bit of snooping on why a heavy session can lead to puking-

* Too much food or water in the stomach. Stomach volume is limited, and stomach emptying rates are lower during exercise than at other times. As the old saw says, ?Don?t swim (or squat) until an hour after eating.?
* High or maximum heart rate and uncontrolled breathing. Sustained heavy lifting elevates the heart rate and blood pressure. This brings on a ?sick to the stomach? feeling.
* Bending over during a period of maximum heart rate, especially while inhaling. The esophageal sphincter is a band of muscle that closes off the top of the stomach. It prevents stomach contents from re-entering the esophagus. Unfortunately, it?s notoriously weak and can open due to an overfull stomach, bending over while drawing a heavy breath, or a highly elevated heart rate.