depends on the sport....like all things above....what is the effort level, how long are the periods of exertion, etc. A pole vaulter and NFL running back would not be the same. For professional sports involving explosion over 30sec and < 2-3 min (glycolitic), they need glycogen....which needs to be already in the muscles. Now extend that over 2-3 hours like a hockey game and you bet your ass they will probably need some gatorade....but that's just during the game.
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