Effect of cimetidine on marathon-associated gastrointestinal symptoms and bleeding.
Occult gastrointestinal bleeding occurs in 8-30% of marathon runners. We hypothesized that cimetidine would decrease bleeding by reducing acid-mediated injury and conducted a blinded, placebo-controlled prospective trial to determine the impact of cimetidine on gastrointestinal symptoms and bleeding during a marathon. Thirty participants in the 1989 Marine Corps or New York City marathons completed pre- and postrace: (1) a questionnaire evaluating demographic, medication usage, training history, and gastrointestinal symptoms; (2) three consecutive stool Hemoccult (HO) cards; and (3) a stool Hemoquant (HQ). Fourteen runners (CR) took 800 mg of cimetidine by mouth 2 hr before the start and 16 runners (PR) took placebo. Three subjects were HO+ prerace and were not analyzed. Three subjects failed to take drug as directed and were analyzed as PR. Five of 14 PR and two of 13 CR were HO+ postrace (P greater than 0.05). Prerace HQ values (PR: 1.49 +/- 0.6 and CR: 0.60 +/- 0.1 mg hemoglobin/g stool) were not significantly different from postrace HQ values (PR: 0.73 +/- 0.2 and CR: 0.86 +/- 0.2 mg Hgb/g stool). Despite postrace HO+ conversion, no individual postrace HQ became abnormal. The frequency of gastrointestinal symptoms was similar for CR and PR, as well as HO- and HO+ individuals. Cimetidine did not significantly affect occult gastrointestinal bleeding as measured by HO or HQ results. This suggests that marathon-associated gastrointestinal symptoms and bleeding may be due to lesions other than acid-mediated disease or hemorrhagic gastritis.
Department of Surgery, Walter Reed Army Medical Center, Washington, DC 20307-5001.
F M
FM
Moses
R S
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Baska
D A
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Peura
P A
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Deuster
D000328:Adult; D002927:Cimetidine / Q000627:therapeutic use*; D004311:Double-Blind Method; D005260:Female; D005756:Gastritis / Q000175:diagnosis / Q000188:drug therapy; D005767:Gastrointestinal Diseases / Q000188:drug therapy*; D006471:Gastrointestinal Hemorrhage / Q000188:drug therapy*; D006801:Humans; D008297:Male; D009780:Occult Blood; D010807:Physical Endurance; D011446:Prospective Studies; D012420:Running
D002927:Cimetidine