New study shows casual joggers outlast ironmen over long term

February 2, 2015 10:26 PM

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Vigorous running -- faster than 7 mph, more than 2.4 hours a week, more than three times a week - - could be almost as harmful as sitting around doing nothing, according to a new cardiology study that's likely to stoke the debate over how much exercise is too much.

The paper, published Monday in the Journal of the American College of Cardiology, suggests there may be a point at which exertion becomes dangerous, outweighing the benefits of exercise. While the study didn't specify how strenuous running could hurt people, researchers noted the stress that intense...

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