Journal
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
Volume 59, Issue 3, Pages 663-673Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TBME.2011.2171959
Keywords
Cardiovascular unteractions; multitaper spectragram; time-frequency coherence; Wigner-Ville distribution
Categories
Funding
- Ministerio de Ciencia e Innovacion, Spain [TEC2010-21703-C03-02, TRA2009-0127]
- Diputacion General de Aragon, Spain, through Grupos Consolidados GTC [T30]
- Instituto de Salud Carlos III, Spain, through CIBER [CB06/01/0062]
- ARAID
- Ibercaja
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An assessment of the dynamic interactions between cardiovascular signals can provide valuable information to improve the understanding of cardiovascular control. In this study, two methodologies for the characterization of time-frequency (TF) coherence between cardiovascular signals are described. The methodologies are based on the smoothed pseudo-Wigner-Ville distribution (SPWVD) and multitaper spectrogram (MTSP), and include the automatic assessment of the significance level of coherence estimates. The capability to correctly localize TF regions, where signals are locally coupled, is assessed using computer-generated data, and data from healthy volunteers. The SPWVD allows for the localization of these regions with higher accuracy (AC>96.9% for SNR >= 5 dB) than the MTSP (AC>84.4% for SNR >= 5 dB). In 14 healthy subjects, TF coherence analysis was used to describe the changes, which a tilt table test provokes in the cardiovascular control. Orthostatic stress provoked an increase in the coupling between R-R variability (RRV) and systolic arterial pressure variability; it did not provoke any significant changes in the coupling between RRV and respiration. In HF band, it decreased the strength of the coupling between RRV and pulse interval variability estimated from arterial pressure signal.
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