Title :
1/f spectrum slope of 24 hour heart rate variability signal in normal and hypertensive subjects
Author :
Calcagnini, G., Jr. ; Lino, S. ; Strano, S. ; Cerutti, S. ; Calcagnini, G.
Author_Institution :
Istituto di Malattie Tropicale ed Infettive, La Sapienza Univ., Rome, Italy
Abstract :
The power spectrum density of the heart rate beat to beat variability signal shows, in a frequency range of less than 0.01 Hz, a behaviour inversely proportional to frequency. This finding has been related to the chaotical component of the signal and the expression of the complexity of the heart rate control mechanisms. The authors tested the 1/f mathematical model on the 24 hour heart rate in 40 subjects, half normal and half young essential hypertensive. The authors found that 1/f slope is 1.12±0.14 in the normal subjects and 1.24±0.15 in the hypertensive ones (p<0.02). The data suggest a loss of complexity in cardiovascular control in essential hypertension
Keywords :
electrocardiography; medical signal processing; spectral analysis; 1/f mathematical model; 1/f spectrum slope; 24 h; 24 hour heart rate variability signal; cardiovascular control complexity loss; frequency range; heart rate control mechanisms; normal subjects; power spectrum density; signal chaotical component; young essential hypertensive subjects; Autocorrelation; Cardiology; Chaos; Equations; Heart rate; Heart rate variability; Hypertension; Mechanical factors; Proportional control; Testing;
Conference_Titel :
Computers in Cardiology 1993, Proceedings.
Conference_Location :
London
Print_ISBN :
0-8186-5470-8
DOI :
10.1109/CIC.1993.378382
