Kulyk V. Influence of different modes of rhythmic extreme cooling on structure and functions of neurohumoral system of young and aged rats’ body

The object of study was structural and functional state of the neurohumoral system of young and aged animals before and after the application of different modes of rhythmic extreme cold (RECE). The aim of the work was to determine the influence of different modes of rhythmic extreme cooling on the structural and functional states of the neurohumoral system of the body of young and aged animals. Research methods were as follows: cryobiological (rhythmic extreme cooling of animals in cryochamber conditions at – 60C and –120C depending on the studied regimen), electrophysiological (electrocardiogram recording with subsequent spectral analysis of heart rate variability), physiological (assessment of cognitive functions in rats), spectrophotometric (determination of the level of malonic dialdehyde in brain tissues), biochemical and enzyme-linked immunosorbent assays to examine blood serum, electron microscopic methods for studying the brain cells and statistical analysis of the obtained data. It was shown for the first time that the use of the combined mode of RECE (–60°С; –120°С; –120°С), especially in aged rats, promoted an improvement of cognitive functions, renewal of rhythm of neurohumoral influences on an organism, restoration of hormone-synthesizing ability activation of metabolic processes in the liver, improvement of the antioxidant system, synthetic, bioenergetic, metabolic functions of the brain cells and vessels.