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A large proportion of the United States population
participates in athletic activities, often involving systematic sports training and
competition. As a consequence, considerable interest has evolved regarding physiologic and
morphologic cardiac adaptations to physical conditioning (i.e., athlete's heart)1-6. In addition, the sudden unexpected deaths of young
athletes have become highly visible events that have stimulated considerable debate7. These rare but devastating catastrophes have usually
proven to be the consequence of a variety of unsuspected congenital or acquired
cardiovascular disease8-12. Sports participants are
also subject to certain other cardiovascular risks, including commotio cordis - i.e., the
less well recognized phenomenon of blunt, nonpenetrating and relatively innocent appearing
chest blows leading to virtually instantaneous cardiac arrest without structural injury to
be ribs, sternum or heart13,14.
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