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[PaceAdvantage]

Originally Posted by VigorsTheGrey

I wonder if, maybe if used, steroids made his heart oversized....sounds more plausible than the gene theory..http://www.sport-horse-breeder.com/large-heart.html

No, an enlarged heart is NOT a usual side effect from steroid use. I've researched this myself.

However, being a fine-tuned athlete will lead to a larger heart, but it's the "good kind" of enlargement...as any muscle will get larger when exercised constantly, and your heart is indeed a muscle...