The effect of 2-hour running on postprandial gastric secretion, gastric emptying, serum gastrin and triglycerides and gastrointestinal motility was studied in six conscious dogs with gastric and duodenal fistulas and a Heidenhain pouch. Gastric acid secretion from the Heidenhain pouch did not change during the first hour of the exercise. During the second hour, however, acid secretion was significantly depressed when the speed of the treadmill was 4 km/h or 6 km/h, compared to the nonexercise control. Pepsin secretion from the Heidenhain pouch was decreased after a meal whether the animals had exercise or not. During the second hour of running at a speed of 4 km/h, pepsin output was slightly but significantly higher than the nonexercise control.
　Serum gastrin levels did not change whether dogs had exercise or not. Serum triglyceride after one hour of exercise was significantly lower than that of the non-exercise control. Gastric emptying of a liquid meal was not altered during the exercise. Gastrointestinal tract has been shown to contract every 100 minutes. This interdigestive contraction was not observed during the exercise. Instead, irregular small contraction appeared. After the cessation of the exercise, inter-digestive contraction appeared at the expected time intervals, 200 minutes after the preexercise interdigestive contraction.

DESCENTE SPORTS SCIENCE Vol.11/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE