Among professional baseball players, Mark McGwire recently acknowledged using them off and on for nearly a decade, including 1998, when he hit 73 home runs to set a new major league single-season record. Anabolic steroids, which mimic the muscle-building effects of the male hormone testosterone, have been used by athletes in various sports. Baggish, an assistant in medicine at Massachusetts General Hospital, and lead author of a report on the study published online April 27 in Circulation: Heart Failure.
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