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Extra high frequencies (EHF) occupy the spectrum of 30—300 GHz (wavelength
spectrum is 10—1 mm). In the EHF-spectrum, the reaction of bio-objects is caused
by frequency resonances, and high therapeutic effectiveness is recorded under
weak radiation.
One of advantages of EHF-therapy include: painlessness (which is especially im-
portant for children and hypersensitive patients), the exclusion of accidental con-
tamination of patients and medical staff.
The depth of penetration of EHF-radiation upon impact on the human skin sur-
face is 300—500 μm, i. e. it is almost completely absorbed by the epidermis and top
layers of the derma. The zone of its direct action covers nervous system receptors
(mechanoreceptors, nociceptors and free nerve endings), the capillary channel of
the blood system; skin leukocyte depot; cells of the diffuse neuroendocrine system,
in particular mast cells. Therefore, the objects of therapeutic action of EHF-therapy
are:
y • nervous system;
y •
immune system and phagocytes;
y •
system for regulation of the blood’s aggregative state (coagulative and anti-
coagulative mechanisms);
y • humoral control system.