[The reaction of the kidneys and acid-base and osmotic homeostasis to moderate physical exertion in patients with chronic pyelonephritis in the pre-azotemia period].

Bicycle ergometry (BE) up to submaximal heart rate provoked moderate metabolic acidosis in 52 patients with chronic pyelonephritis (CP) in preuremic stage. Similar changes in acid-base balance following BE were noted in 14 patients with chronic glomerulonephritis (CGN). BE in CP promoted the reduction in diuresis and fraction water excretion, elevation of creatinine concentration in the urine and its concentration index in the absence of alterations in sodium and osmotic homeostasis.