Nach dem Fall beim IM70.3 letztes Jahr in Wiesbaden habe ich den folgenden Artikel gefunden.
http://www.physorg.com/news157482153.html
"For the study, researchers used records on 922,810 triathletes competing in 2,846 USA Triathlon-sanctioned events between January 2006 and September 2008.
Of the 14 deaths identified, 13 occurred during swimming; the other was a bike crash. Autopsies on six of the victims showed that four had underlying heart problems. Two others had normal-looking hearts, but they may have suffered a fatal heart rhythm problem, Harris said"
Schwimmen scheint im Wettkampf vergleichweise mit dem höchsten Risiko behaftet zu sein.