Endurance sports may cause changes in the hearts of some athletes that can lead to a rare but life-threatening condition which causes an abnormal heart rate and rhythm, Belgium researchers said on Monday. Ventricular arrhythmia (VA), a disturbance that occurs in the ventricles or lower chambers of the heart, is a condition that can cause sudden death in top athletes who have had no previous symptoms of the disorder. After studying Dutch and Belgian endurance athletes with VA and other healthy sportspeople and volunteers, the researchers found that in the athletes with the problem the right ventricle (RV) of the...