Gastric emptying and intestinal absorption during prolonged severe exercise.

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Abstract
The effect of 1 hr. of exercise which loads the O2 transporting system to 71% (64-78%) of maximum O2 uptake on gastric emptying the intestinal absorption was studied in 4 males and 1 female. Gastric emptying of a solution containing 13.3% glucose and 0.3% NaCl was not affected by exercise. Gastric emptying of a second test solution consisting of pure H2O was very slightly inhibited by exercise. There was no difference in the amount of acid recovered from the stomach during rest and exercise. Intestinal absorption in both the jejunum and ileum was studied by a constant perfusion, nonabsorbable marker technique. In neither area of the intestine did exercise show any consistent influence on the rate of glucose, H2O, Na, Cl, K, or bicarbonate absorption. Similarly, the absorption of the passively transported substances L-oxylose, urea-14C, and tritiated H2O was not affected by exercise.