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Related Experiment Videos

Urinary changes in ultra long-distance marathon runners

J C Kallmeyer1, N M Miller

  • 1Renal Unit, St. Augustine's Hospital, Durban, Natal, South Africa.

Nephron
|January 1, 1993
PubMed
Summary

Marathon runners often show red blood cells in urine post-race. This study suggests lower urinary tract bleeding, not kidney damage, is the likely cause, with changes resolving within a week.

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Area of Science:

  • Sports Medicine
  • Nephrology
  • Urology

Background:

  • Ultra-endurance running can cause physiological stress.
  • Hematuria (red blood cells in urine) is a potential consequence for athletes.
  • Differentiating the source of hematuria is crucial for diagnosis.

Purpose of the Study:

  • To investigate the prevalence and origin of hematuria in ultra-endurance marathon runners.
  • To utilize urinary red blood cell indices to distinguish between upper and lower urinary tract sources.
  • To assess the persistence of urinary changes and potential for renal damage.

Main Methods:

  • Studied urine samples from 45 male and female athletes post-marathon.
  • Screened for red blood cells in urine.
  • Measured urinary mean corpuscular volume (MCV) of red cells.
  • Analyzed red blood cell morphology.

Main Results:

  • 24.4% of athletes exhibited hematuria.
  • Most red blood cells were non-dysmorphic with MCV > 72 fL.
  • This pattern indicated a lower urinary tract origin for hematuria.
  • Urinary changes resolved within 7 days.
  • No significant residual renal damage was detected.

Conclusions:

  • Post-marathon hematuria in this cohort likely originates from the lower urinary tract.
  • Urinary MCV is a useful indicator for differentiating hematuria sources in athletes.
  • Transient hematuria following endurance events does not appear to cause lasting kidney damage.

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