Gender characteristics of heart rate regulation among servicemen under influence of different intensity informational stress
Introduction. The study of gender peculiarities of the influence of different intensity informational stress on the regulatory functions of the body of military operators is relevant in connection with the ratification of the Law on Equal Rights of Women and Men in the Military Service of the Armed Forces of Ukraine and other military formations and active women involvement as servicemen to extreme conditions service.
The purpose of the study is to identify the gender peculiarities in heart rate variability changes among servicemen who are working under increased nervous-emotional stress state due to influence of varying intensity informational stress.
Materials and methods. 73 healthy male and female servicemen aged 22-25 were studied (58% of them were men). An adequate model of stressful influence to achieve the study goal has been developed, where the effect of the information factor of different intensity was used as a stress-related load. The study of the heart rate variability was carried out with the help of the hardware and software complex "Cardio Sens" before the use of information load, during information processing by a person in different terms of complexity and content of information, as well as after the information load. The analysis of the results was carried out using the methods of descriptive statistics, dispersion analysis with the software STATISTICA 8.0.
Results. It was found that in women, the stress-index before the start of the testing procedure and during tasks on the quality of dynamic memorization is more than twice as high as among men (p <0.001), which indicates greater stress in women. A distinctive feature in the structure of the spectral power of high-frequency waves (HF) is increased vagal activity before the start of testing among women, and vagal activity prevails in the end and after its end in men. It indicates longer duration of sympathetic nervous system activity among them. The peculiarities of servicemen heart rate variability under influence of different intensity informational stress determine the lower probability of excessive reaction growth from the cardiovascular system in men during the information factor action, as evidenced by the prevalence of the parasympathetic autonomous contour of regulation of the heart rate over the central contour at the end of the entire period of information load.
Conclusions. It has been proved that the “adaptation price” to information stress among military women was significantly higher at combined cognitive and temporal information load compared to men. It was noted the significant tension of regulatory functions in unusual and previously unknown conditions of activity (test load). The established peculiarities of the influence of information stress on the energy level of different gender body functioning can become the basis for the improvement of psychophysiological support and the identification of psychophysiological mechanisms for ensuring high reliability of military personnel performance, and especially women, in case their deployment to real extreme conditions of combat environment.
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