"A dry bath with "cold fire." Altho millions of volts are used in the process, this form of bath is quite pleasant. The currents throw off all dead skin, scale and dirt clinging to the skin. Besides the treatment is distinctly invigorating, leaving the skin rosy and all a-tingling. Every home will soon be equipt with a huge Tesla coil." Hugo Gernsback (Sci Fi notable)
This is using A/C. D/C would penetrate and cause biological heating and biological currents disruption.