Synchronization of low-frequency oscillations in the human cardiovascular system

2009 ◽  
Vol 19 (3) ◽  
pp. 033112 ◽  
Author(s):  
A. S. Karavaev ◽  
M. D. Prokhorov ◽  
V. I. Ponomarenko ◽  
A. R. Kiselev ◽  
V. I. Gridnev ◽  
...  
Keyword(s):  
Cardiovascular System ◽  
Low Frequency ◽  
Low Frequency Oscillations ◽  
Human Cardiovascular System

scholarly journals Роль гидродинамических параметров в формировании низкочастотных колебаний артериального давления у человека

2016 ◽  
Vol 11 (2) ◽  
pp. 233-244 ◽  
Author(s):  
А.А. Гриневич ◽  
A.A. Grinevich
Keyword(s):  
Cardiovascular System ◽  
Low Frequency ◽  
Maximum Amplitude ◽  
Autonomous Control ◽  
System Response ◽  
Low Frequency Oscillations ◽  
Heart Pump ◽  
Cardiovascular Flow ◽  
Human Cardiovascular System

The mechanism of forming of low-frequency oscillations in the human cardiovascular system is a burning issue today. The current paper considers a hypothesis of hydrodynamic nature of these oscillations, which are formed without the involvement of autonomous control of the cardiovascular system from the autonomic nervous system. The developed reduced hydrodynamic model was used to study the system response on additive periodic perturbation of wide-ranged frequencies that affects the performance of the heart pump, as well as the role of hydrodynamic parameters of the cardiovascular bed in this process. It was shown that low-frequency perturbation of pump wall rigidity forms low-frequency oscillations in the arterial part of the cardiovascular flow without autonomous control, with the maximum amplitude observed at frequency close to 0.1 Hz.

scholarly journals Mathematical models in the human cardiovascular system. Approaches to the description of 0.1 Hz oscillations of heart rate variability and the magistral blood flow

2019 ◽  
Vol 17 (4) ◽  
pp. 11-23
Author(s):  
A. A. Grinevich
Keyword(s):  
Cardiovascular System ◽  
Low Frequency ◽  
Hydrodynamic Properties ◽  
Low Frequency Oscillations ◽  
Vascular Bed ◽  
Main Emphasis ◽  
New Ideas ◽  
Human Cardiovascular System ◽  
System Approaches

The review focuses on the application of methods of mathematical modeling in the study of the mechanisms underlying the formation of low-frequency oscillations in the human cardiovascular system. The main emphasis is put on 0.1 Hz rhythms and related author’s works. New ideas about the fundamental role of the hydrodynamic properties of the vascular bed in the formation of low-frequency oscillations at the frequency of 0.1 Hz are presented and justified.

Synchronization of low-frequency oscillations in the cardiovascular system: Application to medical diagnostics and treatment

2013 ◽  
Vol 222 (10) ◽  
pp. 2687-2696 ◽  
Author(s):  
V.I. Ponomarenko ◽  
M.D. Prokhorov ◽  
A.S. Karavaev ◽  
A.R. Kiselev ◽  
V.I. Gridnev ◽  
...  
Keyword(s):  
Cardiovascular System ◽  
System Application ◽  
Low Frequency ◽  
Medical Diagnostics ◽  
Low Frequency Oscillations

scholarly journals PECULIARITIES OF HEART RATE VARIABILITY IN NEWBORNS

2018 ◽  
Vol 63 (4) ◽  
pp. 52-57 ◽  
Author(s):  
O. S. Panina ◽  
A. R. Kiselev ◽  
E. I. Borovkova ◽  
Yu. V. Chernenkov ◽  
V. V. Skazkina ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Cardiovascular System ◽  
Low Frequency ◽  
Heart Rhythm ◽  
Regulatory Elements ◽  
Healthy Adults ◽  
Low Frequency Oscillations ◽  
Vegetative Regulation ◽  
Synchronous Recording

Heart rate variability values are potentially important for assessing vegetative dysfunction in children.The purpose of the research: a comparative study of spectral heart rate variability parameters and synchronization of low-frequency oscillations, characterizing baroreflex in the vegetative regulation of the cardiovascular system in healthy newborns and adults.15 healthy newborns and 60 healthy individuals in the age of 18-34 years old were included in the study. We performed synchronous recording of electrocardiograms and photoplethysmograms with 10 minutes duration, at rest. Were evaluated spectral heart rate variability indices and the index of synchronization of low-frequency oscillations in heart rate variability and photoplethysmograms (S index).Results. In newborns, the peak of low-frequency oscillations was predominantly in the range 0.07–0.09 Hz, and high frequency 0.40–0.50 Hz. Newborns had lower LF% values than adults: 22.8 (14.1, 29.4) vs 32.9 (25.1, 41.9) (p=0.009). The S index in newborns was 20.1 (16.9, 26.5)%, and 33.2 (21.2, 45.4)% in healthy adults (p=0.023).Conclusion. We have first demonstrated that the interaction of baroreflex regulation of heart rhythm and peripheral blood filling in healthy newborns is characterized by lower values of S index, than in healthy adults, which can be explained by the immaturity of the vegetative regulatory elements of the cardiovascular system. 

scholarly journals Cardiovascular System Interactions With The Local Earth Magnetic Field Fluctuations: A Cohort Study

2021 ◽  
Author(s):  
Greta Ziubryte ◽  
Gediminas Jarusevicius ◽  
Mantas Landauskas ◽  
Minvydas Ragulskis ◽  
Rollin McCraty ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Cardiovascular System ◽  
High Frequency ◽  
Low Frequency ◽  
Local Magnetic Field ◽  
Coronary Syndrome ◽  
Increased Risk ◽  
Earth Magnetic Field ◽  
Field Activity ◽  
Human Cardiovascular System

Abstract Background: Geomagnetic storms strongly affect the human cardiovascular system, misbalancing adaptive mechanisms and causing severe adaptive stress responses at all levels of body regulation. Most physiological changes occur after a defined period following geomagnetic climate alterations, this ‘delay period’ lasts for 2-3 days. Methods: In total, 4730 patients admitted between 2015 and 2017 due to acute coronary syndrome (ACS) and acute onset of arrhythmias have been included into the study.Results: Higher time varying magnetic field (TVMF) activity in low frequency ranges is associated with lower number of admissions due to ACS, while higher TVMF activity in high frequency ranges is associated with increased risk for ACS occurrence. The greater TVMF activity in low frequency ranges is associated with higher rates of admission due to cardiac arrhythmias. Additional ACS analysis showed that red blood cell count decreases with increased MF strength in low frequency ranges, while white blood cells and platelets count increases in the same MF frequency ranges. The highest serum osteocalcin level was found 3 days after certain MF strength changes in low frequency ranges in patients with ACS. Strong correlations were found between more than 2 cases of AMI per day and MF strength changes 2- and 3- days before admission. Conclusions: Earth’s local magnetic field is strongly related on human cardiovascular system metabolism and neural regulation. Increased Magnetic field activity in low frequency ranges is associated with heart metabolism and may induce better cardiovascular health, while increased magnetic field activity in high frequency ranges leads to heart problems especially to occurrence of ischemic heart disease and arterial hypertension.

scholarly journals Mobile Device for Monitoring of Cardiovascular System State Based on Assessment of Synchronization of its Low-Frequency Rhythms

2018 ◽  
Vol 10 (1) ◽  
pp. 46-51 ◽  
Author(s):  
M.D. Prokhorov ◽  
D.D. Kulminskiy ◽  
E.I. Borovkova ◽  
A.S. Karavaev ◽  
V.I. Ponomarenko ◽  
...  
Keyword(s):  
Heart Rate ◽  
Blood Flow ◽  
Cardiovascular System ◽  
Functional State ◽  
Mobile Device ◽  
Continuous Monitoring ◽  
Low Frequency ◽  
System State ◽  
Basic Frequency ◽  
Low Frequency Oscillations

We develop an autonomous mobile device for continuous monitoring of cardiovascular system functional state, which is based on the assessment of synchronization between the low-frequency oscillations in heart rate and blood flow having a basic frequency close to 0.1 Hz.

Bifurcation in a Simple Model of the Cardiovascular System

2000 ◽  
Vol 39 (02) ◽  
pp. 118-121 ◽  
Author(s):  
S. Akselrod ◽  
S. Eyal
Keyword(s):  
Nonlinear Dynamics ◽  
Blood Pressure ◽  
Heart Rate ◽  
Fixed Point ◽  
Cardiovascular System ◽  
Modified Model ◽  
Mayer Waves ◽  
Sustained Oscillations ◽  
Human Cardiovascular System ◽  
Physiological Values

Abstract:A simple nonlinear beat-to-beat model of the human cardiovascular system has been studied. The model, introduced by DeBoer et al. was a simplified linearized version. We present a modified model which allows to investigate the nonlinear dynamics of the cardiovascular system. We found that an increase in the -sympathetic gain, via a Hopf bifurcation, leads to sustained oscillations both in heart rate and blood pressure variables at about 0.1 Hz (Mayer waves). Similar oscillations were observed when increasing the -sympathetic gain or decreasing the vagal gain. Further changes of the gains, even beyond reasonable physiological values, did not reveal another bifurcation. The dynamics observed were thus either fixed point or limit cycle. Introducing respiration into the model showed entrainment between the respiration frequency and the Mayer waves.

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