Gastric basal secretion during exercise and restitution in patients with chronic duodenal ulcer.

Gastric basal secretion was studied at rest, in the course of one hour's exertion and one hour's restitution in 10 patients with chronic duodenal ulcer, aged 21-52. The subject performed exercise on a Monark ergometer under a load that gave constant pulse rate acceleration equal to 50% of the age-related maximum. Gastric juice samples were collected with the subjects sitting, in three successive phase of rest, exercise, and restitution. It was found that during exercise there was an increase in the gastric juice volume, HCl levels in it, basal secretion volume, and overall sodium, potassium, chloride, calcium, and magnesium content, their concentration in the juice having remained constant. In the course of restitution the above values did not differ in any significant way from those obtained at rest.