Abstract
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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