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Renal function in marathon runners
Abstract
Thirty-one competitors in a particularly strenuous 54mile marathon race had their renal function assessed before and after the event. Seventy per cent of them had red cells in their urine and 60% showed proteinuria after the event, but in most cases the urine returned to normal apart from a trace of protein after 24 hours. Elevations in blood urea and. potassium were moderate and not related to urinary changes. These abnormalities were also transient and in those competitors showing the most marked changes, creatinine clearance returned to normal within 4 months and usually within 2 weeks. No significant structural changes were noted in 4 patients who had pyelograms. The electrocardiograms of these runners showed no ischaemic changes, and the serum proteins remained normal.
