What is the adrenaline disorder associated next to Michael Phelps and Lance Armstrong?

I heard of a disorder associated with Armstrong and Phelps that pertained to their consumption of adrenaline allowing them to hold a longer stamina and things of that sort. I was wondering if any of you know the name of such a disorder?
Answers:    i dont think its a disorder as such they just produce more adreniline so they enjoy more determineation to win a race


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