|English: Illustration of the pain pathway in René Descartes' Traite de l'homme (Treatise of Man) 1664. The long fiber running from the foot to the cavity in the head is pulled by the heat and releases a fluid that makes the muscles contract. (Photo credit: Wikipedia)|
I must admit that sometimes the procedure works better than other times. I do not know if this is because I am better hydrated or the nurse is more skillful. I think it is a combination of the two. They seem to send in their "A team" when I show up.