ABSTRACT
This chapter provides an overview of the history and state of the art of Electromagnetic field (EMF) therapy and includes nearly the entire spectrum of frequency ranges, starting with static magnetic field and reaching terahertz signals. Therapy using EMF developed in various stages and involved any new discovery in the basic science, especially biophysics and bioelectrochemistry. The fundamental questions for engineers, scientists, and clinicians is to identify the biochemical and biophysical conditions under which EMF signals could be recognized by cells in order to modulate cell and tissue functioning. The pulsed electromagnetic field (PEMF) signals in clinical use have a variety of designs, which in most cases are selected without any motivation for the choice of the particular waveform, field amplitude, or other physical parameters. The importance of the impedance of the waveshape and harmonics in physics and biology remains to be determined.
