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ScienceDaily (Aug. 29, 2011) — A Swedish study presented at the ESC Congress 2011, found a higher incidence of arrhythmias in cross-country skiers with a long history of endurance training. Compared to those who had completed one single race, those who had completed 7 or more races had 29% higher risk of a subsequent arrhythmia. Further, elite athletes finishing at 100-160% of the winning time had 37% higher risk of arrhythmias than recreational athletes finishing at more than 241% of the winning time.[...]http://www.sciencedaily.com/releases/2011/08/110829114029.htm