Corticosteroids and Training: A Small Endurance Boost, a Real Muscle Cost, and a Ban That Depends on the Route

Corticosteroids - prednisone, dexamethasone, hydrocortisone and the rest - sit in an awkward place for anyone who trains. They are among the most prescribed drugs in medicine, they are prohibited in competition when taken systemically, and the reason for the prohibition is a modest but measurable performance effect that comes bundled with side effects athletes should fear more than any drug test.

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