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ORLANDO, Fla. — Warning to weekend warriors: Swim-bike-run triathlons pose at least twice the risk of sudden death as marathons do, the first study of these competitions has found.
And although that risk is low — about 15 out of a million participants — it’s not inconsequential, the study’s author says.
Almost all the deaths in the study occurred during the swim portion, usually the first event. Cold water constricts blood vessels, making the heart work harder and aggravating any pre-existing problems. The Associated Press



