Restrictive Heart : There is a rare problem seen in ultra marathoners and super high level athletes called hypertrophic cardiomyopathy. The heart gets so strong, almost "too strong" in a manner such that it actually IMPEDES blood flow into the heart. This is quite rare, here is a link to case study. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC482078/
Answered 5/27/2015
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