Measures of LLE of heart rate in different frequency bands: a possible measure of relative vagal and sympathetic activity

In this study, we investigated spectral measures and measures of nonlinear dynamics and chaos of heart rate (HR) time series in 10 normal controls and 10 patients with panic disorder (a condition associated with anxiety) during awake and sleep periods and 28 normal control subjects and 42 age-matche...

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Bibliographic Details
Published in:Nonlinear analysis: real world applications 2004-07, Vol.5 (3), p.441-462
Main Authors: Yeragani, Vikram K., Radhakrishna, R.K.A., Ramakrishnan, K.R., Srinivasan, S.H.
Format: Article
Language:English
Subjects:
Anxiety
Chaos
Digital filtering
Heart rate variability
Largest Lyapunov exponent
Nonlinear
Sleep
Spectral
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Summary:In this study, we investigated spectral measures and measures of nonlinear dynamics and chaos of heart rate (HR) time series in 10 normal controls and 10 patients with panic disorder (a condition associated with anxiety) during awake and sleep periods and 28 normal control subjects and 42 age-matched patients with panic disorder, in supine and standing postures. We obtained minimum embedding dimension (MED) and largest Lyapunov exponent (LLE) of unfiltered (UF) and filtered HR time series. We digitally filtered the series into very low-frequency series (VLF:
ISSN:1468-1218
1878-5719
DOI:10.1016/j.nonrwa.2003.07.002