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Urinary red-cell morphology during exercise.

R G Fassett, J E Owen, J Fairley

British Medical Journal (Clinical Research Ed.)

|November 20, 1982

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Long-distance running commonly causes increased red blood cells in urine, often with dysmorphic cells and red blood cell casts, indicating a glomerular origin for exercise-induced hematuria.

Area of Science:

Nephrology
Sports Medicine
Urology

Background:

Exercise, particularly long-distance running, can impact renal function.
Urinary abnormalities post-exercise are not fully understood.
Assessing changes in urine composition after strenuous activity is crucial.

Purpose of the Study:

To investigate urinary changes in athletes after long-distance running.
To determine the source of hematuria (blood in urine) following exercise.
To analyze the presence of red blood cells, white blood cells, and casts.

Main Methods:

Examined midstream urine samples using phase-contrast microscopy.
Analyzed samples from 48 subjects before and immediately after a long-distance run.
Performed dipstick testing for proteinuria and hematuria.

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Main Results:

Increased urinary red blood cell counts were observed in 44 subjects post-exercise.
Dysmorphic red blood cells, indicative of a glomerular source, were present in all subjects.
Red blood cell casts and increased hyaline/hyaline-granular casts were noted in many participants.

Conclusions:

Exercise-induced hematuria is common after long-distance running.
The presence of dysmorphic red blood cells and casts confirms a glomerular origin.
Strenuous exercise can transiently affect the glomeruli, leading to detectable urinary changes.