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The aim was to study autonomic regulation of the heart in the Yakut students with various psychophysiological characteristics. Methods: A comparative analysis of the temporal and spectral parameters of heart rate variability was performed in 46 male Yakut students aged 18-21 years characterized by different levels of extra-introversion, neuroticism and trait anxiety. Results: The Yakut young men showed a high proportion of ambiverts (58.7 %) and a low proportion of students with neuroticism (56.5 %). Altogether, 67.4 % of students had high level of trait anxiety. Among the subjects with a low level of neuroticism, significantly lower values of heart rate and stress index were observed in introverts vs. extroverts. Significant differences in heart rate parameters were found between students with high- and medium- levels anxiety. The former have higher values of Mo, variation range (VR), SDNN, RMSSD than the latter. However, subjects with a very high level of trait anxiety (> 55 points), have significantly lower parameters of VR, SDNN, RMSSD, HF, LF compared with students with high levels of anxiety. Conclusions: The state of heart's regulatory systems of the students varies depending on the individual psychophysiological qualities. The most adapted to the environment are introverts with low neuroticism and introverts with high level of trait anxiety. A risk group includes extraverts with very high trait anxiety. A new limit of trait anxiety level was suggested (>54 points). Higher level of anxiety leads to stress which in turn may lead to breakdown of adaptive mechanisms.

AUTONOMIC REGULATION OF HEART RATE IN THE YAKUT STUDENTS WITH DIFFERENT PSYCHOPHYSIOLOGICAL STATUS