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Grinevich AA, Chemeris NK. Spectral Analysis of Heart Rate Variability Based on the Hilbert-Huang Method. DOKL BIOCHEM BIOPHYS 2023; 511:169-172. [PMID: 37833602 DOI: 10.1134/s1607672923700333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/10/2023] [Accepted: 04/15/2023] [Indexed: 10/15/2023]
Abstract
Analysis of heart rate variability (HRV) is widely used for noninvasive assessment of the state of the regulation systems of the heart. The aim of this study was to evaluate the capabilities of the Hilbert-Huang method for calculating spectral parameters of HRV in comparison with the commonly used Fourier analysis. Fourier analysis allows estimation of averaged spectral amplitudes and power of HRV oscillations in fixed frequency intervals, which are associated with the activity of sympathetic, parasympathetic, and humoral regulation systems. Using the Hilbert-Huang method, we revealed four spectral components, described by Gaussian functions, in which HRV oscillations are concentrated, and showed the absence of fixed boundaries between them. The obtained energy quantitative characteristics of the spectral components of heart rhythm oscillations can serve as the basis for diagnostic methods of heart rhythm regulation, supplementing the commonly used ones.
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Affiliation(s)
- A A Grinevich
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Russia.
| | - N K Chemeris
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Russia.
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Tikhonova IV, Tankanag AV, Guseva IE, Grinevich AA. Analysis of interactions between cardiovascular oscillations for discrimination of early vascular disorders in arterial hypertension and type 2 diabetes. Biomed Signal Process Control 2023. [DOI: 10.1016/j.bspc.2022.104222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Tikhonova IV, Grinevich AA, Guseva IE, Tankanag AV. Effect of orthostasis on the regulation of skin blood flow in upper and lower extremities in human. Microcirculation 2020; 28:e12655. [PMID: 32860464 DOI: 10.1111/micc.12655] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2020] [Revised: 07/08/2020] [Accepted: 08/13/2020] [Indexed: 12/18/2022]
Abstract
OBJECTIVE The research is aimed to investigate interactions between cardiovascular signals and to assess contributions of central and local mechanisms to skin blood flow regulation in upper and lower extremities at rest and under orthostasis. METHODS Heart rate variability, respiration, forearm, and foot skin blood flow were assessed at rest and during postural test in 25 healthy volunteers. Spectral analysis was performed. Phase synchronization degree of analyzed signals was determined by group phase wavelet coherence function. RESULTS Skin blood flow was lower on foot at rest and during postural test than on forearm. High-frequency component of heart rate variability was higher at ~0.3 Hz during postural test versus rest. Blood flow oscillation amplitudes on the foot were lower in frequency range including respiratory interval at rest than on forearm. Postural exposure increased amplitude of foot blood flow oscillations in respiratory interval and decreased amplitudes in cardiac interval versus rest. Orthostasis increased group wavelet phase coherence between foot blood flow and heart rate variability or respiration, as well as between forearm and foot blood flow at 0.3 Hz corresponding to respiration. CONCLUSIONS The contribution of central mechanisms associated with respiration to blood flow regulation increased in lower extremities during orthostasis.
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Affiliation(s)
- Irina V Tikhonova
- Institute of Cell Biophysics of Russian Academy of Sciences, Pushchino, Russia
| | - Andrey A Grinevich
- Institute of Cell Biophysics of Russian Academy of Sciences, Pushchino, Russia
| | - Irina E Guseva
- Hospital of Pushchino Scientific Centre of Russian Academy of Sciences, Pushchino, Russia
| | - Arina V Tankanag
- Institute of Cell Biophysics of Russian Academy of Sciences, Pushchino, Russia
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Tikhonova IV, Grinevich AA, Kosyakova NI, Safronova VG. Delayed kinetics of phagocytosis related respiratory burst in blood is a distinctive feature of moderate exacerbation of bronchial asthma. Free Radic Biol Med 2019; 134:327-334. [PMID: 30685404 DOI: 10.1016/j.freeradbiomed.2019.01.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 01/10/2019] [Accepted: 01/20/2019] [Indexed: 01/15/2023]
Abstract
Atopic bronchial asthma based on allergy history and chronic inflammation is hazardous to patients due to the risk of exacerbation. The sign of severe exacerbation is considered an abundant number and high activity of granulocytes in respiratory system and blood. Relationships between the ability of cells in blood to produce reactive radicals and their metabolites and the severity of asthma remain largely unclear. Kinetics of respiratory burst evoked by microbe particles in blood samples of patients was studied to reveal the most significant predictors distinguishing states of moderate exacerbation and out of exacerbation. Asthmatic patients with exacerbation (n = 18) or out of exacerbation (n = 62) and healthy individuals (n = 43) were characterized on respiratory function, cell count in blood and kinetics of generation of reactive radicals and their metabolites during phagocytosis. Mean values of respiratory parameters forced expiratory volume in 1 s and peak expiratory flow rate in patients with exacerbation were significantly differed compared with same of patients out of exacerbation and healthy individuals. Mean values of cell count in blood did not significantly differed in patients with exacerbation and out of exacerbation. Receiver operating characteristic analysis showed that both cell count and respiratory indexes did not discriminate patients with exacerbation from out of exacerbation. A delayed response to opsonized zymosan was revealed in patients with exacerbation compared to other examinees: lengthened lag-time and Tmax, reduced production of reactive species. Tmax was the most statistically significant predictor to discriminate bronchial asthma exacerbation from bronchial asthma out of exacerbation (area under curve >90%, p < 10-5) and controls (area under curve >80%, p < 10-5). Thus kinetic parameters of the phagocyte response to opsonized zymosan in the whole blood are the best predictors of bronchial asthma exacerbation in comparison with respiratory parameters and blood cell count. This test can be used for immunological monitoring of bronchial asthma status to prevent exacerbation.
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Affiliation(s)
- Irina V Tikhonova
- Laboratory of Cellular Neurobiology, Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, 142290, Russia
| | - Andrey A Grinevich
- Laboratory of Cellular Neurobiology, Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, 142290, Russia; Laboratory of Cellular Engineering, Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Pushchino, 142290, Russia
| | - Ninel I Kosyakova
- Department of Allergology and Immunology, Hospital of Pushchino Scientific Centre, Russian Academy of Sciences, Pushchino, 142290, Russia
| | - Valentina G Safronova
- Laboratory of Cellular Neurobiology, Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, 142290, Russia; Department of Allergology and Immunology, Hospital of Pushchino Scientific Centre, Russian Academy of Sciences, Pushchino, 142290, Russia.
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Grinevich AA, Yakushevich LV. The influence of the DNA torque on the dynamics of transcription bubbles in plasmid PTTQ18. J Theor Biol 2018; 453:68-77. [PMID: 29709587 DOI: 10.1016/j.jtbi.2018.04.036] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 10/02/2017] [Accepted: 04/25/2018] [Indexed: 01/28/2023]
Abstract
In this work, we study numerically the influence of the DNA torque on the movement of transcription bubbles in the potential field formed by the sequence of plasmid PTTQ18. To imitate the movement, we apply a modified sine-Gordon equation with the two additional terms that describe the effects of dissipation and the action of the DNA torsion torque, and with the coefficients that depend on the sequence of bases. We obtain the trajectories of the transcription bubbles and investigate the dependence of the trajectories on the initial bubble velocity and the DNA torsion torque. It is shown that not the initial bubble velocity but the DNA torsion torque governs the trajectories of the transcription bubbles.
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Affiliation(s)
- Andrey A Grinevich
- Institute of Cell Biophysics RAS, Institutskaya str. 3, Pushchino, Moscow Region 142290, Russia; Institute of Theoretical and Experimental Biophysics RAS, Institutskaya str. 3, Pushchino, Moscow Region 142290, Russia.
| | - Ludmila V Yakushevich
- Institute of Cell Biophysics RAS, Institutskaya str. 3, Pushchino, Moscow Region 142290, Russia
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Vrublevskaya VV, Afanasyev VN, Grinevich AA, Skarga YY, Gladyshev PP, Ibragimova SA, Krylsky DV, Dezhurov SV, Morenkov OS. A sensitive and specific lateral flow assay for rapid detection of antibodies against glycoprotein B of Aujeszky's disease virus. J Virol Methods 2017; 249:175-180. [DOI: 10.1016/j.jviromet.2017.09.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 09/12/2017] [Accepted: 09/12/2017] [Indexed: 10/18/2022]
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Tikhonova IV, Kosyakova NI, Grinevich AA, Nadeev AD, Chemeris NK, Safronova VG. Accelerated reactivity of blood granulocytes in patients with atopic bronchial asthma out of exacerbation. Immunobiology 2017; 223:8-17. [PMID: 29032837 DOI: 10.1016/j.imbio.2017.10.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2017] [Revised: 09/20/2017] [Accepted: 10/04/2017] [Indexed: 12/13/2022]
Abstract
Reactive oxygen species (ROS) are important in bronchial asthma (BA) pathogenesis owing to accumulation of activated granulocytes in the lungs. But the ROS-producing activity of the cells is insufficiently understood in the blood of BA patients. This study analyzes the kinetics of phagocyte respiratory burst in the blood to improve the methods of BA patients monitoring. Patients with atopic BA out of exacerbation (n=60) and healthy controls (n=43) were recruited. The time-course of respiratory response to opsonized zymosan (OZ) was recorded in the whole blood using luminol-dependent chemiluminescence (CL), and its activation kinetics (lag-time, rate, amplitude, ROS production) was calculated. The discriminative power of ROS generation kinetics was defined by Receiver Operating Characteristic (ROC) curve analysis. Standard physiological respiratory parameters of patients did not differ from the controls. More rapid response to OZ was recorded in BA patient samples versus the controls. The primed state of phagocytes in the blood of BA patients was corroborated by significant weakening formyl peptide priming effect. The adhesion of granulocytes to cultured human endothelial cells was two-fold higher in BA patients versus controls. ROC curve analysis exhibited good discriminative effectiveness of the CL kinetics to compare BA individuals with the controls. The highest power (86% sensitivity and 90% specificity) was achieved at a linear combination of the parameters. We assume that the assessment of phagocyte reactivity based on the analysis of the response kinetic profile is a good test for monitoring of the state in BA patients.
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Affiliation(s)
- Irina V Tikhonova
- Institute of Cell Biophysics, Russian Academy of Sciences, Institutskaya st., 3, Pushchino, Moscow region, 142290, Russia.
| | - Ninel I Kosyakova
- Hospital of Pushchino Scientific Center, Russian Academy of Sciences, Institutskaya st., 1, Pushchino, Moscow region, 142290, Russia.
| | - Andrey A Grinevich
- Institute of Cell Biophysics, Russian Academy of Sciences, Institutskaya st., 3, Pushchino, Moscow region, 142290, Russia; Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Institutskaya st., 3, Pushchino, Moscow region, 142290, Russia.
| | - Alexander D Nadeev
- Institute of Cell Biophysics, Russian Academy of Sciences, Institutskaya st., 3, Pushchino, Moscow region, 142290, Russia; ISechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, pr. Torez, 44, Saint Petersburg, 194223, Russia.
| | - Nikolai K Chemeris
- Institute of Cell Biophysics, Russian Academy of Sciences, Institutskaya st., 3, Pushchino, Moscow region, 142290, Russia.
| | - Valentina G Safronova
- Institute of Cell Biophysics, Russian Academy of Sciences, Institutskaya st., 3, Pushchino, Moscow region, 142290, Russia.
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Grinevich AA, Tankanag AV, Safronova VG, Chemeris NK. Role of additive stochastic modulation of the heart activity in the formation of 0.1-Hz blood flow oscillations in the human cardiovascular system. Dokl Biol Sci 2016; 468:106-11. [PMID: 27411819 DOI: 10.1134/s0012496616030054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Indexed: 11/23/2022]
Abstract
In the framework of our previous hypothesis about the participation of structural and hydrodynamic properties of the vascular bed in the formation of the 0.1-Hz component of blood flow oscillations in the human cardiovascular system and on the basis of the reduced hydrodynamic model, the role of additive stochastic perturbations of the operation of the single-chamber pump that simulates the heart was investigated. It was shown that aperiodic noise modulation of the rigidity of the walls of the pump or its valves generates low-frequency oscillations of pressure and blood flow velocity of arterial vascular bed with the maximum amplitude at a frequency close to 0.1 Hz.
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Affiliation(s)
- A A Grinevich
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290, Russia.
| | - A V Tankanag
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290, Russia
| | - V G Safronova
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290, Russia
| | - N K Chemeris
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow oblast, 142290, Russia
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Grinevich AA, Ryasik AA, Yakushevich LV. 130 Modeling the DNA bubbles dynamics. J Biomol Struct Dyn 2015. [DOI: 10.1080/07391102.2015.1032763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Tankanag AV, Grinevich AA, Kirilina TV, Krasnikov GV, Piskunova GM, Chemeris NK. Wavelet phase coherence analysis of the skin blood flow oscillations in human. Microvasc Res 2014; 95:53-9. [DOI: 10.1016/j.mvr.2014.07.003] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2014] [Revised: 07/04/2014] [Accepted: 07/05/2014] [Indexed: 11/25/2022]
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Berestovskiĭ GN, Kataev AA, Grinevich AA. [Slow Ca2'-binding Mg2+- EDTA buffer for intracellular perfusion]. Biofizika 2007; 52:466-8. [PMID: 17633535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
In studies of currents in perfused cells or their membrane fragments containing potential-dependent Ca channels and Ca2+-activated channels, a buffer slowly binding Ca2+ appears useful in some cases. A buffer with EDTA in excess of Mg2+ has been proposed, and its kinetic characteristics have been calculated. It has been shown that this buffer, depending on its component proportions, may provide Ca2+ binding with a characteristic time of up to tens of milliseconds. For comparison, in the cytoplasm, this time does not exceed 1 ms even with a large calcium signal, as follows from calculations.
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Kazachenko VN, Kochetkov KV, Astashev ME, Grinevich AA. [Fractal properies of gating in potential-dependent K+-channels in Lymnaea stagnalis neurons]. Biofizika 2004; 49:852-65. [PMID: 15526471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/01/2023]
Abstract
Sets of the channel open times, [tau(o)], and closed times, [tau(c)], and the full set of the channel open and closed times, [tau(o), tau(c)], in the activity of single voltage-dependent K+-channels in mollusc L. stagnalis neurons were analyzed using the rescaled range analysis (Hurst method), fast Fourier and wavelet transforms. It was found that the Hurst dependence for each time series could be approximated by a polygonal line with at least two slopes: H1 and H2 (Hurst exponents). The averaged values of H1 and H2 for the sets [tau(o), tau(c)] were equal to 0.61 +/- 0.03 and 0.83 +/- 0.11, respectively; for the [tau(o)] sets H1 = 0.66 +/- 0.03 and H2 = 0.95 +/- 0.10; for the [tau(c)] sets, H1 = 0.62 +/- 0.05 and H2 = 0.85 +/- 0.10. In some cases, a third slope appeared on the Hurst dependences. It was very variable and ranged between 0.5 and 1. The Hurst exponents H1, H2, and H3 characterized short, intermediate, and long time ranges, respectively. The ranges greatly varied from experiment to experiment. The data obtained show that the channel openings and closings (gating process) represent a persistent process correlated in time. The randomization of the time sets resulted in a single slope, H, of 0.52 +/- 0.02 characteristic of random processes. The results were confirmed by the fast Fourier and wavelet transforms. In addition, possible voltage dependences of Hurst exponents and their correlation with tau(o) and tau(c) were investigated. As a whole, single channel activity may be characterized as a multifractal process with a slight voltage dependence of the Hurst exponents.
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Kazachenko VN, Kochetkov KV, Aslanidi OV, Grinevich AA. [Study of fractal properties of single ionic channel gating mechanism by the fast Fourier transform]. Biofizika 2001; 46:1062-70. [PMID: 11771279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Sets of the channel open times (tau o), closed times (tau c) and the full set of the channel open and closed times (tau o, tau c) in the activity of single Ca(2+)-activated K+ channels in cultured kidney cells Vero were analyzed using the fast Fourier transform. It was found that in the low-frequency range (about 0.01-10 Hz), power density can be described by the equation S(f) approximately f-alpha (as a rule, 0 < alpha < 1), and this part of the Fourier spectrum usually consists of narrow peaks at almost multiple frequencies. It was shown that the upper frequency boundary of this spectrum is determined by the kinetic parameters tau o [symbol: see text] tau c. The data obtained show that ion channel gating is a fractal process (correlated in time) and can be regarded as a random signal modulated by some periodical functions (sinuses). The data obtained by the Fourier method are in agreement with the earlier results obtained using the rescaled-range analysis.
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Affiliation(s)
- V N Kazachenko
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
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