This article was a study of 27 endurance athletes vs. 20 non-endurance athletes. "The different groups underwent a new type of magnetic resonance imaging of their hearts that identifies very early signs of fibrosis, or scarring, within the heart muscle. Fibrosis, if it becomes severe, can lead to stiffening or thickening of portions of the heart, which can contribute to irregular heart function and, eventually, heart failure'.
http://well.blogs.nytimes.com/2011/03/09/when-exercise-is-too-much-of-a-good-thing/?scp=1&sq=When%20Exercise%20Is%20Too%20Much%20of%20a%20Good%20Thing&st=cse
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