Key result
Generational residence in the North from the 0-th to 2nd generation was associated with optimized cardiovascular system parameters, increased resting parasympathetic activity, and decreased reactivity to active orthostatic testing.
Why the study?
Changes in functional reserves of hemodynamics and heart rate variability during active orthostatic test in North newcomer Caucasians and their 1st and 2nd generation descendants were not specified.
Cross-Sectional (n=106)
No
Answers are grounded in this paper and cite their sources.
Objective: to specify changes in functional reserves of hemodynamics and heart rate variability at performing active orthostatic test by migrants (0-th generation) and those born in the North in the 1st and 2nd generation, all residents of Magadan region. Material and methods: 106 young males aged 17-21, permanently residing in the North, were examined. All the young men were divided into 3 groups: newcomer Caucasians (0-th generation) and people born to them in the region (in the 1st and 2nd generations). Readjustments in cardiorhythm and hemodynamics in response to the active orthostatic test were studied. Results. At the resting state, young male examinees demonstrated their parasympathetic influence of the autonomic system on the heart rate regulation to increase from the 0th to the 2nd generation, which is observed together with more economical functioning of the cardiovascular system. In response to the orthostatic test, the 2nd generation subjects showed optimum autonomic support in hemodynamics by reducing the activity of the parasympathetic link which reflected the inhibition of vagal activity in order to moderately activate the sympathetic link of autonomic regulation. Conclusion. We could observe optimization in cardiovascular system in each next generation in the North with the decrease in reactivity to active orthostatic test and the growth in the parasympathetic link of autonomic nervous system at rest.
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Averyanova et al. (2021) conducted a cross-sectional in Healthy young men adapted to Northern conditions (n=106). Generational residence in the North (1st and 2nd generation) vs. Newcomer Caucasians (0-th generation/migrants) was evaluated on Changes in functional reserves of hemodynamics and heart rate variability (HRV) during an active orthostatic test. Generational residence in the North from the 0-th to 2nd generation was associated with optimized cardiovascular system parameters, increased resting parasympathetic activity, and decreased reactivity to active orthostatic testing.
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