Assessment of Autonomic Regulation of Heart Rate Variability by the Method of Complex Demodulation

Document Type

Article

Publication Date

1-1-1989

Abstract

Complex demodulation was used to examine the effect of both divisions of the autonomic nervous system (sympathetic and parasympathetic) on heart rate. Data were analyzed from dogs during classical conditioning procedures which caused different changes in the autonomic regulation of heart rate. Two significant peaks in the heart rate variability spectrum were examined by this technique. The amplitude of the peak at the respiration frequency showed parasympathetic changes, while the amplitude of the low frequency peak (0-0.124 Hz) showed both sympathetic and parasympathetic effects. Complex demodulation results at these frequencies clearly showed the activities of both branches of the autonomic nervous system in regulating heart rate. During the CS+ period, when trained dogs were presented with a tone predicting a subsequent shock, the observed tachycardia was due to decreased parasympathetic activity and a transient increase in sympathetic activity. During the CS-period where a different tone predicts no shock, parasympathetic and sympathetic activities were unchanged from the baseline condition. The use of complex demodulation enables us to examine autonomic contributions to heart rate regulation in conditioning and a variety of other physiological and environmental conditions where autonomic input can be expected to change rapidly. © 1989 IEEE

Identifier

0024617724 (Scopus)

Publication Title

IEEE Transactions on Biomedical Engineering

External Full Text Location

https://doi.org/10.1109/TBME.1989.1201373

e-ISSN

15582531

ISSN

00189294

PubMed ID

2917773

First Page

274

Last Page

283

Issue

2

Volume

36

Grant

R01HL024498

Fund Ref

National Heart, Lung, and Blood Institute

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