Death By Running: It's The Heat And Not The Heart — forbes.com

The growing popularity of marathons and other extreme sports has sparked worries about the potential dangers of these activities. The popular press and medical research have both focused on the risk of cardiac arrest and other heart rhythm problems. But  that concern may be misdirected. A new study from Israel published in the Journal of the American College of Cardiology finds that a much more serious danger may be heat stroke, which is defined as a core body temperature above 104 or 105 degrees associated with multiorgan dysfunction.

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