I wouldn't try it. Though maybe I'm unique. My body wants to pass out when I donate. I've done it, especially for friends or family going in for surgery, however, it takes me a good long while to recover. If I were to ride after, I am quite certain I'd be passed out on the side of the road, still clicked into the pedals!
YMMV
Last edited by PhotoJoe; 05-03-10 at 08:56 PM.