Abstract
The heart rate variability (HRV) can be taken as an indicator of the coordination of the cardio-respiratory rhythms. Bispectral analysis using a direct (fast Fourier transform based) and time-invariant approach has shown the occurrence of a quadratic phase coupling (QPC) between a low-frequency (LF: 0.1 Hz) and a high-frequency (HF: 0.4–0.6 Hz) component of the HRV during quiet sleep in healthy neonates. The low-frequency component corresponds to the Mayer–Traube–Hering waves in blood pressure and the high-frequency component to the respiratory sinus arrhythmia (RSA). Time-variant, parametric estimation of the bispectrum provides the possibility of quantifying QPC in the time course. Therefore, the aim of this work was a parametric, time-variant bispectral analysis of the neonatal HRV in the same neonates used in the direct, time-invariant approach. For the first time rhythms in the time course of QPC between the HF component and the LF component could be shown in the neonatal HRV.
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Acknowledgment
This study was supported by the Deutsche Forschungsgemeinschaft (DFG, Wi 1166/2-3 and 2-4).
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Schwab, K., Eiselt, M., Putsche, P. et al. Time-variant parametric estimation of transient quadratic phase couplings between heart rate components in healthy neonates. Med Bio Eng Comput 44, 1077–1083 (2006). https://doi.org/10.1007/s11517-006-0120-7
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DOI: https://doi.org/10.1007/s11517-006-0120-7