Abstract
The study involved 14 volunteer students. Situational anxiety was determined, tests were carried out to determine simple and complex sensorimotor reactions, the cardiac rhythm of the subjects was recorded. Oxygen saturation was determined using an oximeter. Dynamic parameters were recorded: lying in a state of functional rest (background 1), vertical at 65-70° (vertical), lying after verticalization (horizontal), lying in a state of functional rest (background 2). The analysis of the data obtained was carried out using the Excel and StatPlus Pro programs. It was revealed that during verticalization, changes in the regulation of the heart activity of the subjects are carried out mainly due to the central mechanisms of regulation through the sympathetic nervous system. The transfer from a vertical to a horizontal state is accompanied by a restructuring of the regulatory system towards the activation of subcortical nerve centers and a shift in the balance of the SNS/PSNS towards the parasympathetic nervous system.
 Key words: passive orthostatic test, cardiac rhythm, simple sensorimotor reaction.
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