I was discussing cycling doping with a nurse the other day and I said I didn't see how untrained cyclists could IV themselves without all kinds of accidents. I've had dozens of dye injections for kidney stone xrays and every 3 or 4 times I'd get a bruise the size of a baseball. A few other times a vein hematoma..and this was just injecting maybe 6 oz of dye.. Quickly infusing saline or blood would be even more risky..My nurse friend said they probably have an infusion port buried under the skin..If they don't I would be interested in knowing how they hide bruises and needle marks..You'd think their feet would be off limits as well as any location that would cause pedaling or sitting problems. The visible arm veins would have to be left alone. One other thing..Starting your own IV would be impossible for most people..