VEGETATIVE REGULATORY MECHANISMS IN DIFFERENT GEOMAGNETIC CONDITIONS DEPENDING ON A DEGREE OF PHYSICAL CONDITIONING

The aim of the study was to evaluate the vegetative regulatory action in healthy, untrained and trained individuals in different geomagnetic conditions. The study involved 94 healthy untrained young men aged 18-22 years - I group (control), and 60 trained volunteers aged 18-25 years - II group, who during the period of the study and for at least three years prior have been following active regular physical exercise regimen(weight lifting), but were not professional athletes. In order to evaluate the heart rate variability the following statistical indicators were studied: arithmetic mean, the arithmetic mean of the error variance, dispersion, the arithmetic mean deviation, coefficient of skewness, kurtosis, standard deviation of the mean. Geometric analysis was performed using a variation pulsometry. All the individuals were studied in natural/tranquil conditions, during naturally occuring or a simulated geomagnetic storm, which provided the use of the characteristics of vegetative balance as a marker for differential assessment of the impact of electromagnetic field (EMF). The forecast of natural geomagnetic conditions had been made at least three days before the study. Under the conditions of simulated geomagnetic storm the test subjects were placed in a solenoid with non-magnetic equipment. EMF inductance in the solenoid corresponded to the geomagnetic storm frequencies. The study had a nature of social experiment and was carried out by a single blind method: tested subjects were unaware of geomagnetic conditions during the study. This was an open, three-step, cohort, prospective study with parallel character. The results showed that under the uniform qualitative conditions (balanced, in particular) of initial state of vegetative equilibrium, the level of fitness of the human body determines the differentiated response to EMF exposure. Thus, with the possible inclusion of the EMF in the complex of therapeutic or preventive measures, it is necessary to predict homeostatic resources and body's reactivity to EMF exposure.