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Related Experiment Videos

Gastrointestinal bleeding during an ultramarathon.

R S Baska1, F M Moses, G Graeber

  • 1General Surgery Service, Walter Reed Army Medical Center, Washington, D.C. 20307.

Digestive Diseases and Sciences
|February 1, 1990
PubMed
Summary
This summary is machine-generated.

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Most runners experienced detectable gastrointestinal bleeding after a 100-mile race. Lower digestive symptoms like nausea and diarrhea were linked to this bleeding, highlighting a common issue in endurance athletes.

Area of Science:

  • Sports Medicine
  • Gastroenterology
  • Physiology

Background:

  • Endurance running, particularly ultramarathons, places significant physiological stress on the body.
  • Gastrointestinal (GI) distress is a common complaint among endurance athletes.
  • The incidence and correlation of detectable GI bleeding with specific symptoms in 100-mile race participants remain under-investigated.

Purpose of the Study:

  • To prospectively determine the frequency of detectable gastrointestinal bleeding in participants of a 100-mile running race.
  • To investigate the correlation between gastrointestinal symptoms and evidence of bleeding.
  • To identify factors associated with GI bleeding in this population.

Main Methods:

  • A prospective study involving 35 runners participating in a 100-mile race.

Related Experiment Videos

  • Pre- and post-race questionnaires assessed training, diet, medication use, GI history, and race experience.
  • Stool samples were analyzed for blood using the Hemoccult method (3 pre-race, 3 post-race).

    • Main Results:

    • 85% of participants who were Hemoccult-negative pre-race became Hemoccult-positive post-race.
    • Post-race Hemoccult positivity correlated with more frequent and intense nausea, diarrhea, abdominal cramping, and bloating (P < 0.05).
    • Lower GI symptoms, but not upper GI symptoms, correlated with Hemoccult positivity.

    Conclusions:

    • The majority of 100-mile race participants exhibit evidence of gastrointestinal bleeding post-event.
    • Lower gastrointestinal symptoms are common and significantly correlate with detectable GI bleeding.
    • Findings suggest a high prevalence of exercise-induced GI bleeding in ultramarathon runners.