Furosemide effect on gastric basal secretion during exercise and postexercise restitution in healthy subjects.

The purpose of this work was determination of furosemide effect on basal gastric secretion during exercise and postexercise restitution in 8 healthy men aged 22-25 years. The investigations were performed three times determining each time the basal acid output during three successive hours. In the first test the determinations were done during one hour rest, then after intravenous furosemide administration 2 mg/kg, and again between 60 and 120 minutes after the injection. In the second test BAO was determined at rest, during one-hour exercise, and during restitution. In the third test the determinations were done at rest, during exercise preceded by furosemide injection as in the first test, and during one hour of post-exercise restitution. The exercise on a Monark cycle ergometer was, on the average, 275 210 +/- 12 500 J in the second test and 284 870 +/- 14 480 J in the third test. Furosemide caused a statistically significant decrease of BAO at rest (p less than 0.02) and during exercise (p less than 0.01), this was due to a significant reduction in gastric juice volume (p less than 0.001) and in the second hour of furosemide action also to a decrease of HCI concentration (p less than 0.05). Decreased excretion of electrolytes by the gastric mucosa was proportional to changes in gastric juice volume. The 24-hour urinary excretion of sodium, potassium and chlorides increased after furosemide in the first test (p less than 0.001), and in the third test (p less than 0.02).