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- Title
Gastrointestinal blood loss and anemia in runners.
- Authors
Stewart, J G; Ahlquist, D A; McGill, D B; Ilstrup, D M; Schwartz, S; Owen, R A
- Abstract
Iron deficiency, with or without anemia, occurs commonly in long-distance runners, but the cause is unknown. The recent development of a simple quantitative assay for fecal hemoglobin, HemoQuant , allowed us to study whether gastrointestinal bleeding occurs in runners. Blood and stool samples were collected from 24 runners before and after a race of 10 to 42.2 km and from age- and sex-matched, nonrunning controls. The mean blood hemoglobin level and hematocrit were significantly lower in runners than in controls. Serum ferritin levels were below normal in 4 runners but in no controls. Fecal hemoglobin levels increased in 20 of 24 runners (p less than 0.01) after a race. Mean fecal hemoglobin level was 1.08 mg/g (range, 0.11 to 2.36) in controls and 0.99 mg/g (0.18 to 2.41) in runners before a race, but peaked at 3.96 mg/g (0.37 to 43.20) after a race. Competitive long-distance running induces gastrointestinal blood loss and may contribute to iron deficiency.
- Publication
Annals of internal medicine, 1984, Vol 100, Issue 6, p843
- ISSN
0003-4819
- Publication type
Journal Article
- DOI
10.7326/0003-4819-100-6-843