Complex demodulation of heart rate changes during orthostatic testing

Author

Kiauta, T. ; Jager, F. ; Tapp, W.N.

Author_Institution

Dept. of Neurology, Univ. Med. Centre, Ljubljana, Yugoslavia

fYear

1990

fDate

23-26 Sep 1990

Firstpage

159

Lastpage

162

Abstract

Heart rate changes induced by the standing up of young healthy subjects are processed by a complex demodulation algorithm yielding time-local estimates of the amplitude of the heart-rate variability function. Complex demodulate of the high-frequency band (0.15 to 0.45 Hz) shows an abrupt decrease of amplitude immediately after standing up, presumably due into vagal withdrawal. Complex demodulation of a part of the low frequency band (0 to 0.055 Hz) shows a typical form of a bell-shaped curve. It is concluded that while the complex demodulation of the high-frequency band probably reflects parasympathetic activity, the complex demodulation of the low-frequency band does not seem to indicate the level of the sympathetic activity

Keywords

cardiology; electrocardiography; neurophysiology; 0 to 0.055 Hz; 0.15 to 0.45 Hz; ECG signal recording; complex demodulation algorithm; heart-rate variability function; high-frequency band; low-frequency band; orthostatic testing; parasympathetic activity; sympathetic activity; Amplitude estimation; Demodulation; Electrocardiography; Fluctuations; Heart rate; Heart rate variability; Low pass filters; Resonant frequency; Steady-state; Testing;

fLanguage

English

Publisher

ieee

Conference_Titel

Computers in Cardiology 1990, Proceedings.

Conference_Location

Chicago, IL

Print_ISBN

0-8186-2225-3

Type

conf

DOI

10.1109/CIC.1990.144187

Filename

144187