Sudden death syndrome--an umbrella term for a range of heart conditions that can lead to cardiac arrest--is notorious for striking those who seem most fit.
That is because the condition, thought to be largely hereditary, is often triggered by overexertion. Tragically for some, the first symptom can be cardiac arrest.
Read more: http://news.cnet.com/8301-27083_3-20056309-247.html#ixzz1KNIxz4tX
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