Author/Editor		Bračič-Lotrič, Maja; Stefanovska, Aneta; Štajer, Dušan; Urbančič-Rovan, Vilma
Title		Spectral components of heart rate variability determined by wavelet analysis
Type		članek
Source		Physiol Meas
Vol. and No.		Letnik 21, št. 4
Publication year		2000
Volume		str. 441-57
Language		eng
Abstract		Spectral components of heart rate variability (HRV) are determined in the time-frequency domain using a wavelet transform. Based on the finer estimation of low-frequency content enabled by the logarithmic resolution of the wavelet transform, corrections of spectral intervals, already defined by Fourier and model based methods, are proposed. The characteristic peaks between 0.0095 and 0.6 Hz are traced in time and four spectral intervals are defined, I (0.0095-0.021 Hz), II (0.021-0.052 Hz), III (0.052-0.145 Hz) and IV (0.145-0.6 Hz), within which peaks are located fof all subjects included. These intervals are shown to be invariant regardless of the age and the state of the system. We also show that the frequency and power of the spectral components are related to age, AMI and particularly to type II diabetes mellitus.
Descriptors		MYOCARDIAL INFARCTION HEART RATE ELECTROCARDIOGRAPHY DIABETES MELLITUS, NON-INSULIN-DEPENDENT AGE FACTORS SOFTWARE RESPIRATORY MECHANICS REFERENCE VALUES HYPERTENSION FOURIER ANALYSIS DIABETIC ANGIOPATHIES DIABETIC NEUROPATHIES DIABETIC RETINOPATHY