Spontaneous spike activity of supraoptic cells of hypothalamus after 30-day-long exposure of low-intensity extremely-high frequency radiation (42.2 GHz, 0.19 mW/cm2 , daily for an hour) on vibration-stimulated rats (60 Hz, 0.4 mm, 2 hours daily) was analyzed. The distributions of registered cells by the degree of regularity of interspike intervals (ISI), dynamics of succession of ISI and discrete frequency ranges, as well as the mean spike frequency and the coeffi cient of variation of ISIs in naive control and after treatment were evaluated. 30-day-long exposure was followed by signifi cant (P<0.05/P<0.01) shifts in distribution by degree of regularity and dynamics of succession of ISI. These changes were signifi cant in comparison with isolated infl uence of vibration. The signifi cant decrease of mean spike frequency up to 13.5 ± 1.7 imp/s (P<0.01) was revealed. It was accompanied by reliable (P<0.01) abrupt increase of quantity of low-frequency cells as well as decrease of numbers of high- and medium-frequency units. These changes were statistically insignifi cant in comparison with data from isolated action of vibration. The coeffi cient of variation of ISIs after treatment was increased up to 105.3 ± 4.3% (P<0.05). Thus, we suppose that the effect of low-intensity extremely-high frequency radiation depends on initial state of organism.
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