**3. Results**

The results of the temporal analysis of AOG in the main and control groups. Temporal analysis of oscillograms (by analogy with HRV) reflects the state of the ANS and the level of management centralization of the cardiovascular system.

Healthy persons of CG 1-b. To confirm the reliability of AOG in healthy, the representatives of CG 1-b underwent a temporal analysis of AOG and ECG, recorded synchronously at rest in 54 people aged 18–22 (**Figure 1**).

Cases of strong correlation between Mo, heart rate are obtained. RMSSD (0.97 ± 0.02, p < 0.05) on synchronously recorded ECG and AOG make it possible to conclude that the noted indicators characterize not only the level of control of the cardiac activity, but also blood vessels "peripheral heart" [8, 9, 14, 24–34] and confirm the high informativeness of the selected research methods. Similar results were obtained in the analysis of ECG time indicators from literature sources. So, according to I. V. Babunts [25], the Mo index is (0.8 ± 0.03) s, RMSSD – (0.43 ± 0.19) s, which coincides with our results and confirms the reliability of the indicators obtained in the analysis of AOG registered by us.

The results of the temporal analysis of AOG of healthy, patients with COVID-19 and patients undergoing treatment in a closed department of a psychoneurological hospital (PPNH) separately and in comparison with each other are presented in **Table 1**.

Patients with COVID-19 (main group). As can be seen from **Table 1**, in patients with COVID-19 (compared to healthy) there was an increase in SDSD, pHN50, BP (P < 0.05) and Mo (P > 0.05), a decrease in IVR, IN (P < 0.05) and AMo (p > 0.05). The results obtained (by analogy with the HRV ECG [8, 9, 14, 25, 26]) indicate a slight increase in the activity of the parasympathetic link of the ANS, the lack of sympathetic-adrenal response and management centralization of the body defenses of patients with COVID-19. Homeostasis can be maintained by increasing the activity of the sympathetic division of the ANS [8, 9]. The abovementioned is a vegetative correlator of anxiety and leads to a decrease in functional reserves and stress resilience.

Healthy persons of CG 1-c (Ruffier test). To study the reaction of healthy people to an extreme situation, we used a physiological stress situation – physical activity (30 squats in 45 seconds, Ruffier test). Normally, physical activity promotes the activation

#### **Figure 1.**

*Mode indicators (Mo), obtained by analysis of AOG and ECG. Note. On the X axis – A representative sample of 30 people, on the Y axis – On the left the duration of R-R intervals (s).*

