Heart rate variability spectral analysis using quadratic time-frequency representations

Authors:
Eugen R. Lontis;Anastasios G. Bezerianos
Affiliations:
Center for Sensory Motor Interaction, Aalborg University, Aalborg, Denmark;Medical Physics Department, School of Medicine, Patras University, Greece
Venue:
CONTROL'05 Proceedings of the 2005 WSEAS international conference on Dynamical systems and control
Year:
2005

Citing 2
Cited 0

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Abstract

Time frequency representations (TFR) have been assessed with respect to time and frequency resolution using a simulated and real heart rate variability data, HRV. The Wigner-Ville Distribution proved to have a difficult interpretation due to the presence of the cross-terms. Choi-Williams, CW, and Signal-dependent radially Gaussian kernel, SD, TFRs used different techniques for cross-terms suppression and had comparative results due to the auto-terms geometry around the center in the ambiguity domain, with a trade-off between cross-terms suppression and auto-terms smoothing. An elevated vagal and a reduced sympathetic activity in the clinostatic position, and a reduced vagal and elevated sympathetic activity in the orthostatic position, respectively, have been detected in HRV by CW and SD during the tilt-up test.