Influence of nonlinear amplitude dynamics on estimated delay time of coupling between self-oscillatory systems

Sidak, E. V.; Смирнов, Д. А.; Osipov, Grigory V.; Безручко, Б. П.

doi:10.1134/s1063785016030317

Cited by 2 publications

(1 citation statement)

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“…The later study was aimed to adjust parameters of the methods to achieve better sensitivity and specificity in estimation of characteristics of coupling between the HRV and PPGV LF rhythms [18]. In that study, we refined the algorithms of preprocessing, instantaneous phases calculation, estimation of time scales over which the phase variation in modeled, estimation of needed length of the time series, the methods of statistical analysis.…”

Section: Introductionmentioning

confidence: 99%

Autonomic control of cardiorespiratory coupling in healthy subjects under moderate physical exercises

et al. 2019

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Aim of the study is to apply the analysis of phase dynamics to investigation of the coupling patterns between heart rate variability, respiration and peripheral circulation in healthy subjects at rest and after moderate physical exercises. Material and Methods ― 30-minutes electrocardiogram (ECG), photoplethysmogram (PPG) and respiration records were obtained from healthy subjects aged 22±2 (mean ± standard deviation) before and after active Martine Kushelevsky test (20 squats in 30 seconds). The coherence function was estimated between all the signals from each subject, and the phase dynamics modeling was used to detect the directional coupling in high-frequency (HF; 0.14-0.40 Hz) and low-frequency ranges (LF; 0.04-0.14 Hz). Results ― At rest (before the physical activity) no statistically significant couplings were detected between the HF rhythms of respiration and heart rate (RR intervals). For the HF rhythms in respiration and PPG, the influence respirationPPG was detected. No couplings were detected between the LF rhythms. After the moderate physical exercise, predominant direction of the influence was RR intervals  PPG in the LF range and both RR intervals  respiration and PPG  respiration in the HF range. The influence PPG  respiration was delayed by several seconds. Conclusion ― adaptation to the moderate physical activity has led to the decrease in the overall coherence and changes in patterns of directional coupling between the LF and HF rhythms in respiration, heart rate and peripheral circulation. The obtained results confirm nonlinearity and complexity of the coupling patterns in cardiovascular system.

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Section: Introductionmentioning

confidence: 99%