Author/Authors :
Adams J D نويسنده Hydration Science Laboratory, University of Arkansas, Fayetteville, Arkansas, USA , Kavouras Stavros A نويسنده Hydration Science Laboratory, University of Arkansas, Fayetteville, Arkansas, USA , Johnson Evan C نويسنده Human Integrated Physiology Laboratory, University of Wyoming, Laramie, Wyoming, USA , Ganio Matthew S نويسنده Center for Exercise Science Research, University of Arkansas, Fayetteville, Arkansas, USA , Gray Michelle نويسنده Center for Exercise Science Research, University of Arkansas, Fayetteville, Arkansas, USA , McDermott Brendon P نويسنده Center for Exercise Science Research, University of Arkansas, Fayetteville, Arkansas, USA , McKenzie Amy L نويسنده Human Performance Laboratory, University of Connecticut, Storrs, Connecticut, USA , Lee Elaine C نويسنده Human Performance Laboratory, University of Connecticut, Storrs, Connecticut, USA , Armstrong Lawrence E نويسنده Human Performance Laboratory, University of Connecticut, Storrs, Connecticut, USA
Abstract :
[Background]Occult (i.e., non-visible) gastrointestinal (GI) bleeding is a well-recognized complication that can occur during vigorous endurance physical exertion, especially in the heat.[Objectives]The purpose of this study was to investigate the incidence of GI bleeding during a non-impact (cycling) prolonged race (161-km) in the heat.[Methods]Twenty-five experienced cyclists (21 males and 4 females, 49 ± 9 y, 83.7 ± 14.8 kg) were completed a summer 161-km cycling event. Following the race, participants were given a fecal occult blood test and were instructed to retrieve their first bowel movement.[Results]Mean race dry air and wet bulb globe temperature (WBGT) were 36.0 ± 5.2°C, and 31.8 ± 3.6°C, respectively. Of the 25 subjects, two (8%) produced positive results for fecal occult blood while an additional two (16%) experienced constipation, hard stools, diarrhea or vomiting.[Conclusions]These data showed a low incidence of GI complaints and occult bleeding during a prolonged cycling event in the heat, indicating the low-impact exercise such as cycling may lessen some of the occult GI bleeding previously reported in distance running in the heat.
