Softcover (and CD-ROM); 554 pages Since the Roman Empire where live torpedo fish were used to relieve symptoms from haemorrhoids, through to intolerable protracted headaches, and since Galvani in the 18th century noted the twitching of a frog's leg muscle with the use of an electric current, electrophysical agents have been used to introduce various forms of exogenous energy to improve health and relieve symptoms.