Less acid secretion: Heart burn is caused by to acid in the stomach. The production of acid in the stomach is controlled by the hormone gastrin and it in turn is controlled by the neuropeptide gastrin releasing hormone. I suspect that your exercising has reduced grp release and thus decreased your stomach acid production.
Answered 1/8/2015
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Diaphragm?: It is not clear but could be related to that when we exercise, our diaphragm is activiely contracting in order to breath more. The esophogus goes throught the diaphragm and it may be that this hiatus works better when you are exercising. It may also be that you secrete less acid in the stomach under exercise conditions. Probably a little from column a and a little from column b.
Answered 4/7/2012
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