Doping in sports continues making headlines as the U.S. Justice Department investigates state-sponsored doping by dozens of Russian athletes in the Olympic Games. The International Olympic Committee defines doping as "the deliberate or inadvertent use by an athlete of a substance or method banned by the IOC." Those substances and methods include performance-enhancing drugs and procedures that can have a variety of effects, including increasing muscle mass, enhancing recovery, blocking pain, upping the oxygen capacity of the blood to boost muscle performance and endurance, and even preventing detection of doping itself.
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