scholarly journals The method for diagnostics of the phase synchronization of the vegetative control of blood circulation in real time

2021 ◽  
Vol 21 (3) ◽  
pp. 213-221
Author(s):  
A. V. Kurbako ◽  
◽  
E. I. Borovkova ◽  
A. R. Kiselev ◽  
V. V. Skazkina ◽  
...  
Keyword(s):  
Real Time ◽  
Blood Circulation ◽  
Phase Synchronization

scholarly journals Real-Time Blood Circulation and Bleeding Model for Surgical Training

2013 ◽  
Vol 60 (4) ◽  
pp. 1013-1022 ◽  
Author(s):  
J. Boisvert ◽  
G. Poirier ◽  
L. Borgeat ◽  
G. Godin
Keyword(s):  
Real Time ◽  
Surgical Training ◽  
Blood Circulation

scholarly journals Synchronization Of Autonomic Control Loops Of Blood Circulation In Patients With COVID-19

2021 ◽  
Vol 10 (3) ◽  
Author(s):  
Viktoriia V. Skazkina ◽  
Natalia S. Krasikova ◽  
Ekaterina I. Borovkova ◽  
Yurii M. Ishbulatov ◽  
Alexander Yu. Gorshkov ◽  
...  
Keyword(s):  
Blood Circulation ◽  
Vascular Tone ◽  
Phase Synchronization ◽  
Viral Disease ◽  
Autonomic Control ◽  
Healthy Individuals ◽  
Control Loops ◽  
Average Value ◽  
Non Invasive ◽  
Screening Diagnostics

This study aims to investigate the strength of synchronization between the autonomic control loops of the cardiovascular system (CVS) in patients with COronaVIrus Disease 2019 (COVID-19). Methods — We calculated the total percent of phase synchronization index (S index) between the loops of autonomic control of heart rate and vascular tone in two sample groups: healthy individuals and COVID-19 patients. Results — The group-average value of the S index in COVID-19 patients is lower comparing to healthy individuals, the Mann-Whitney U-test confirmed that the differences are statistically significant. Conclusion — Obtained results suggest that the decreased value of the S index reflects the presence of a viral disease, and the S index is a promising basis for non-invasive screening diagnostics of viral diseases, particularly of COVID-19.

scholarly journals Uncovering Interaction Between The Loops Of Autonomic Regulation Of Blood Circulation From Long Time Series

2020 ◽  
Vol 9 (4) ◽  
Author(s):  
Viktoriia V. Skazkina ◽  
Anatoly S. Karavaev ◽  
Ekaterina I. Borovkova ◽  
Margarita A. Simonyan ◽  
Mikhail D. Prokhorov ◽  
...  
Keyword(s):  
Time Series ◽  
Hormonal Regulation ◽  
Blood Circulation ◽  
Phase Synchronization ◽  
Mean Value ◽  
Recording Time ◽  
Long Time Series ◽  
Total Percentage ◽  
Long Time ◽  
The Mean

The purpose of this work is to study the interaction between the autonomic regulatory loops of blood circulation from long time series. Methods ― We simultaneously recorded four-hour signals of electrocardiogram and photoplethysmogram from the ear and finger of ten healthy adults. We determined the intervals of phase synchronization of the studied regulatory loops and analyzed the dependence of their length on the recording time. The deviations of the total percentage of phase synchronization (index S) from its mean value were estimated in moving non-overlapping windows. Results ― For studied signals we found no significant correlation between the length of synchronization epoch and the time of its beginning. A sharp increase in the deviation of the index S from its mean was shown at the end of the experiment. Conclusion ― The increase in the deviation from the mean at the end of our records is most likely associated more with psychosomatic influences than with hormonal regulation or immobilization stress.

Increasing the sensitivity of real-time method for diagnostic of autogenerators phase synchronization based on their non-stationary time series

2021 ◽  
Vol 29 (6) ◽  
pp. 892-904
Author(s):  
Aleksandr Kurbako ◽  
◽  
Danil Kulminskiy ◽  
Ekaterina Borovkova ◽  
Anton Kiselev ◽  
...  
Keyword(s):  
Experimental Data ◽  
Time Series ◽  
Computational Complexity ◽  
Real Time ◽  
Phase Synchronization ◽  
Statistical Properties ◽  
Stationary Time Series ◽  
Test Time ◽  
Stationary Time ◽  
Proposed Modification

Purpose of this work is to of the research – Increasing the sensitivity of a method for diagnosing phase synchronization of autogenerators based on their non-stationary time series in real time, and also a comparison of the statistical properties of the proposed modification of the method with the well-known method for diagnostics of loop synchronization, which has proven itself in the analysis of experimental data. Methods.The paper compares the probabilities of the appearance of an error of the second kind of the developed modified method for diagnostics of phase synchronization with the probabilities of occurrence of an error of the second kind of the known method at equal values of sensitivity. When comparing the methods, generated test time realizations with a priori known boundaries of the phase synchronization sections are used, which repeat the statistical properties of the experimental data. It also compares the computational complexity of the two methods. Results. A modification of the method for diagnosing phase synchronization of autonomic regulation circuits in real time is proposed. It is shown that the proposed modification provides similar values of sensitivity and probability of appearance of errors of the second kind as the previously proposed approach. The developed method has less computational complexity than the previously proposed method. The values of free parameters corresponding to different values of sensitivity and probability of appearance of errors of the second kind are obtained. Conclusion. The area of application of the developed method with modification is formulated. The low computational complexity of the proposed method, as well as the possibility of switching devices to integer computations in calculations, makes it possible to use it for wearable registrations performing calculations in real time, based on small-sized low-power processors that do not support floating-point arithmetic operations.

Experimental Real-Time Phase Synchronization of a Paced Chaotic Plasma Discharge

2000 ◽  
Vol 85 (14) ◽  
pp. 2929-2932 ◽  
Author(s):  
Catalin M. Ticos ◽  
Epaminondas Rosa ◽  
William B. Pardo ◽  
Jonathan A. Walkenstein ◽  
Marco Monti
Keyword(s):  
Real Time ◽  
Phase Synchronization ◽  
Plasma Discharge

scholarly journals Phase synchronization in the system of supply voltage parameters correction by the adaptive filtration method

2021 ◽  
Vol 66 (2) ◽  
pp. 212-219
Author(s):  
R. E. Pervianenak ◽  
A. L. Sitsko
Keyword(s):  
Control System ◽  
Real Time ◽  
Phase Synchronization ◽  
Supply Voltage ◽  
Phase Locked Loop ◽  
Active Filters ◽  
Transient Time ◽  
Filtration Method ◽  
Nlms Algorithm ◽  
Autonomous Objects

An adaptive phase-locked loop is considered, which makes it possible to improve the stability of synchronous active filters, to achieve compensation for high-quality harmonic components of the current consumed by autonomous objects. Therefore, the use of such an active filter will improve the power quality and the normal trouble-free operation of the equipment in general. A control system with an adaptive phase-locked loop often has the advantages of a reliable and efficient control system. It makes it possible to quickly respond to dynamic changes in the load, which is typical for the operation of functional equipment of autonomous objects. The control system becomes more flexible, reliable, efficient and provides an instantaneous value of the compensation current from the measured values of the load current curve. Calculations can be carried out in real time. LMS, NLMS, RLS algorithms are considered as adjusting the weighted adaptive phase-locked loop in the system for correcting the supply voltage parameters. Based on the simulation of algorithms carried out in the MATLAB environment, a comparative analysis of their effectiveness is made. It is shown that the NLMS algorithm has the highest suppression quality and minimum transient time. The NLMS algorithm works in real time and is recommended for use in the supply voltage correction system.

The effect of a rhythmic pulse on the heart rate: Little evidence for rhythmical ‘entrainment’ and ‘synchronization’

2018 ◽  
Vol 24 (3) ◽  
pp. 377-400
Author(s):  
Hanna Mütze ◽  
Reinhard Kopiez ◽  
Anna Wolf
Keyword(s):  
Heart Rate ◽  
Real Time ◽  
Phase Synchronization ◽  
Stimulus Onset ◽  
Circular Statistics ◽  
Musical Stimulus ◽  
Regulatory Feedback Loop ◽  
Musical Tempo ◽  
High Degree ◽  
Rate Frequency

In this study, we investigate the influence of musical tempo on the heart rate. Previous studies showed ambiguous results. Two effects are considered: first, an adaption of the heart rate frequency to the tempo of a musical stimulus (‘entrainment’) and second, the phase synchronization between the stimulus-onset and the R-waves in the ECG (‘synchronization’). A regulatory feedback loop was programmed, which constantly measured the actual heart rate. A simple Djembé-beat was used as a musical stimulus and coupled to the actual heart rate in real-time. To test for ‘entrainment’ effects, we adapted the tempo of the stimulus in real-time to the actual heart rate by increasing the rate 25%, 40% or 55% over the baseline tempo. To test for ‘synchronization’ effects, we presented the stimulus in a constant tempo, tracking the actual heart rate of the test person. Based on circular statistics, results showed no evidence for ‘entrainment’ or ‘synchronization’ effects of the stimulus on the heart rate. Overall, reactions to the trigger pulse were characterized by a high degree of interindividual differences. Thus, we conclude that there is no direct and simple correlation between the musical tempo and the HR contrary to what is often suggested in everyday psychology.

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