re:blood doping, residing at altitude is a 'natural' way to improve the blood's oxygen carrying capacity as red blood cells increase after time spent at altitude. Dropping to lower altitude and voila, 'breathing is easier.' You can 'blood dope' at lower altitudes---the blood is removed from your body and after certain period of time, your body replenishes the missing quantity of red blood cells to bring it back to normal range. Thus, when you add the red cells previously removed, the quantity of red blood cells is elevated above normal. Of course, beside illegal aspects, health aspects are present---who is giving you the 'transfusion'? And your body is under new stresses from dealing with a volume of blood higher than 'normally' present. All to stay under water longer? Steroids also increase muscle size and mass, too,for body builders...until they kill you. Some "training edges" will come back and "cut you."
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