Title On the quantification of heart rate variability spectral parameters using time-frequency and time-varying methods.
Author Mainardi, Luca T
Journal Philos Trans A Math Phys Eng Sci Publication Year/Month 2009-Jan
PMID 18936017 PMCID -N/A-
Affiliation 1.Dipartimento di Bioingegneria, Politecnico di Milano, 20133 Milano, Italy. luca.mainardi@biomed.polimi.it.

In the last decades, one of the main challenges in the study of heart rate variability (HRV) signals has been the quantification of the low-frequency (LF) and high-frequency (HF) components of the HRV spectrum during non-stationary events. At this regard, different time-frequency and time-varying approaches have been proposed with the aim to track the modification of the HRV spectra during ischaemic attacks, provocative stress testing, sleep or daily-life activities. The quantitative evaluation of power (and frequencies) of the LF and HF components has been approached in various ways depending on the selected time-frequency method. This paper is an excursus through the most common time-frequency/time-varying representation of the HRV signal with a special emphasis on the algorithms employed for the reliable quantification of the LF and HF parameters and their tracking.

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