Runners should be more worried about heat stroke than about their heart giving out during a race, Scientific American reports. After studying the health records of 137,580 runners in long-distance races in Tel Aviv, Israel, the researchers found that heat stroke among runners was 10 times more common than an arrhythmia or heart attack, and it killed two of the races’ runners. The researchers recommend that runners competing in warm climates give their bodies up to 2 weeks to adjust.
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