used to get this ALL the time. Almost never now, the two things that helped me: 1- Loosen your grip on the throttle, just stay lightly on it with the glove, hell the friction between the gloves and the throttle with your hand completely open is usually enough to maintain constant throttle 2- rest your pinky and ring fingers on top of the front brake lever. not sure why this works for me, probably by loosening the grip and seems to allow better bloodflow into the hand $.02