Physical activity has many health benefits, but a review found that extremes of endurance exercise can increase cardiovascular disease risk.
The risks of lifelong exercise:
- Can reduce ventricular function and injure the cardiac muscle.
- Can swell all four heart chambers and the thickness of the wall.
- Increases prevalence of myocardial fibrosis, risk of atrial fibrillation and risk of bradycardia.
The benefits of exercise still overwhelm the potential danger as physical activity increases life expectancy and decreases cardiovascular mortality risk.
However, most of us are getting insufficient amounts of exercise and only extreme amounts in select people can adversely affect cardiac function.
New York Times article