Key result
Irrespective of ethnic origin, young males demonstrated similar autonomic responses to an active orthostatic test, though normotonic Europeans showed a significant increase in the low-frequency component of heart rate power.
Why the study?
Do heart rate and hemodynamic responses to an active orthostatic test differ by ethnic origin or baseline autonomic regulation type in young males?
Cross-Sectional (n=102)
Do heart rate and hemodynamic responses to an active orthostatic test differ by ethnic origin or baseline autonomic regulation type in young males?
Hemodynamic and autonomic responses to orthostatic stress in young males are determined by baseline autonomic regulation type rather than ethnic origin.
Answers are grounded in this paper and cite their sources.
Baseline autonomic type may drive orthostatic responses more than ethnicity in young males; hypothesis-generating and requires prospective confirmation before clinical use.
The examinees were 102 male habitants of Anadyr and Chukotsky Autonomous District, 17-19 aged, Europeans (Caucasians) and Aborigines. Functional reserves of autonomic regulation were studied and influence of its changes on cardiohemodynamics at active orthostatic test in different ethnic groups with similar types of original autonomic nervous system. The findings testified that, irrespective of ethnic origin or autonomic tonus similar responses to active orthostatic test were observed focused on weakening parasympathetic section of autonomic nervous system and strengthening sympathetic one. However, fundamental difference was registered in normotonic subjects and occurred in low frequency component of the heart rate power (LF). Cardiac hemodynamic analysis showed that, Europeans (Caucasians) and Aborigines who had different types of autonomic regulation, however, demonstrated their functional indices to largely coincide with each others at either baseline or at active orthostatic test. Some revealed differences were caused by types of autonomic regulation rather than by ethnic origin.
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Maximov et al. (2017) conducted a cross-sectional in Healthy (autonomic regulation assessment) (n=102). Active orthostatic test vs. Supine baseline was evaluated on Heart rate variability and hemodynamic changes. Irrespective of ethnic origin, young males demonstrated similar autonomic responses to an active orthostatic test, though normotonic Europeans showed a significant increase in the low-frequency component of heart rate power.
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