<unk>  is electrically induced heat or the use of high-frequency electromagnetic currents as a form of physical therapy and in surgical procedures. The earliest observations on the reactions of high-frequency electromagnetic currents upon the human organism were made by Jacques Arsene d'Arsonval. The field was pioneered in 1907 by German physician Karl Franz Nagelschmidt, who coined the term<unk>  from the Greek words dia and θέρμη therma, literally meaning "heating through" (adj., diather´mal, diather´mic).<unk>  is commonly used for muscle relaxation, and to induce deep heating in tissue for therapeutic purposes in medicine. It is used in physical therapy to deliver moderate heat directly to pathologic lesions in the deeper tissues of the body.<unk>  is produced by three techniques: ultrasound (ultrasonic<unk> , short-wave radio frequencies in the range 1–100 MHz (shortwave<unk>  or microwaves typically in the 915 MHz or 2.45 GHz bands (microwave<unk> , the methods differing mainly in their penetration capability. It exerts physical effects and elicits a spectrum of physiological responses. The same techniques are also used to create higher tissue temperatures to destroy neoplasms (cancer and tumors), warts, and infected tissues; this is called hyperthermia treatment. In surgery<unk>  is used to cauterize blood vessels to prevent excessive bleeding. The technique is particularly valuable in neurosurgery and surgery of the eye.
Diathermy
Audioanalgesia
Chemturion
Toftness device
Dry needling
Retrobulbar block
Apyrexy
Sadomasochism