UDC

612.084+612.8

DOI

10.17238/issn2542-1298.2019.7.1.49

Authors

Ruslan A. Dzankisov*/**
*300th Laboratory of Aviation Medicine (Moscow, Russian Federation)
**Military Medical Academy named after S.M. Kirov (St. Petersburg, Russian Federation)

Abstract

This paper studied how the degree of one’s extroversion affects the person’s tolerance of hypobaric hypoxia modelled in a pressure chamber. The following parameters were assessed: physiological (heart rate, blood pressure, arterial oxygen saturation) psychophysiological (flicker fusion threshold, time of complex sensorimotor reaction (CSRT)), and physical performance (Ruffier index). As a result, it was found that changes in some physiological parameters of introverts are more pronounced under hypoxia; in particular, by the 25th minute in the chamber their heart rate increases by 37.5 % (p < 0.01) from baseline, and by the 55th minute it increases by 38.1 % (p < 0.01). In extroverts, however, this increase in heart rate does not exceed 33.3 % (p < 0.01) throughout the hypobaric ascend. In addition, subjects with low level of extroversion by the 30th and 60th minute demonstrate a 20.0 % (p < 0.01) and 17.8 % (p < 0.01) lower level of physical performance than those with a high level of extroversion. Moreover, statistically significant changes were observed in psychophysiological indicators. For instance, CSRT in the introvert group is 34.31 ms (p < 0.01) longer on the 20th minute and 42.2 ms (p < 0.01) longer on the 45th minute of the hypobaric ascend than that in extroverts, with a clear negative dynamics of increasing CSRT. Thus, it can be argued that when assessing tolerance to hypoxia one needs to take into account the level of extroversion and its effect on the individual’s functional state.

Keywords

hypobaric hypoxia, individual psychological characteristics, extroversion, functional state, physical performance, Ruffier index, Eysenck Personality Questionnaire

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