![]() ![]() This race offers a unique opportunity to study highly trained individuals undergoing a tremendous stress to not only their cardiovascular and musculoskeletal systems but also to their gastrointestinal system. It is open only to experienced ultrarunners who have completed a 50-mile race in less than 9 hr. The Old Dominion One Hundred Mile Endurance Run is held in the mountains of Virginia each June. It differs from the marathon in duration, pace, and intrarace diet. ![]() An ultramarathon is a race that is longer than the 26.2 miles of a marathon and commonly involves distances of 30–100 or more miles and can last 24 hr or more. Races of longer distances have not been investigated. The cause is unknown, but the frequency of fecal blood loss has been reported to be 8–23% of marathon runners (1–7). Digestive symptoms and gastrointestinal bleeding occur in endurance runners and may contribute to runner's anemia. ![]()
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