HOW RADIOFREQUENCY AFFECTS TISSUES?
The passage of electrical current through a biological system produces a release of heat that is called “Joule effect” . To produce Joule heating in the human body without danger of electric shock, high frequency fields should be used; these change polarity so quickly that they do not produce muscular contraction, fibrillation, or any other side-effect. By applying frequencies above 400 kHz, higher intensity currents may be used without risk of electrocution and we only need to ensure that heat burns do not occur.
