The influence of wideband pulsed-modulated electromagnetic field of low intensity on the whole excitability of the central nervous system

In experiments with male hybrid mice (CBAxC57BL6)F1 the influence of mono- and polyfrequency pulse-modulated electromagnetic field (3-1 Hz, 50 ms) on the whole excitability of the central nervous system (CNS) was studied by the method of ethanol narcotic sleep. The dependence of the CNS response on the power flux density in the pulse under the sum amplitudes from 250 until 2000 µW/cm2 the mean power flux density was varied from 12 up to 300 µW/cm2 and the role of single monofrequency in the whole effect of block. The dependence of the variation in the CNS excitability on the carrier wavelength under wideband polyfrequency radiation within three ranges (1-2, 3-4 and 6-8 GHz) in the condition of isodose distribution of the absorbed energy in structures of brain surface. Statistically significant decrease in the CNS excitability was observed in the nearest period after action of low intensity polyfrequency electromagnetic radiation. It was concluded that this phenomenon might be important in regulatory-hygienic attitude. However, the dependence of the microwave effect on the number of carrier wavelengths, the frequency range and the pulse amplitude is characterized by a complex pattern and the significant change in the excitability arises only under definite combinations of microwave physical parameters.