For most people, the benefits of aerobic exercise far outweigh the risks, however, extreme endurance exercise—such as participation in marathons and triathlons for people who aren’t accustomed to high-intensity exercise—can raise the risk of sudden cardiac arrest, atrial fibrillation (a heart rhythm disorder) or heart attacks, according to a new Scientific Statement “Exercise-Related Acute Cardiovascular Events and Potential Deleterious Adaptations Following Long-Term Exercise Training: Placing the Risks Into Perspective-An Update from the American Heart Association,” published today in the Association’s premier journal Circulation.
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