Measurements of gastric emptying and secretion were made in six subjects taking severe exercise for 20 min on a bicycle ergometer. At levels of exercise greater than 600 kpm/min gastric emptying was significantly reduced in 4 out of 6 subjects. Gastric secretion of acid fell with increase in exercise, but the relation was complex. A single receptor system responding to changes in exercise could not account for the inhibition of gastric emptying and secretion.

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