Title :
Power spectrum density estimation (1/f spectrum) of long term heart rate variability in acute myocardial infarction
Author :
Calcagnini, G., Jr. ; Strano, S. ; Marcheselli, A. ; Cerutti, S. ; Calcagnini, G.
Author_Institution :
Dept. of Inf. & Syst. Sci., Rome Univ., Italy
Abstract :
The power spectrum density of the heart rate beat to beat variability signal of healthy subjects, shows a power law (1/f) behaviour over a time scale ranging from a few minutes to hours. Long term PSD (24 hour Holter recording, frequency range: 0.00001-0.01 Hz) has been estimated in 15 patients who survived myocardial infarction, within 48 h, and after 1 month. PSDs in the acute phase do not show 1/f behaviour, while they seem to recover after one month. The effect of daily physical activity has been also investigated in healthy volunteer subjects resting in bed for 24 h. Preliminary results for this group showed an 1/f PSD. Unfortunately the physiological meaning of such a type of spectrum is not clear and several different underlying mechanism are likely to be involved
Keywords :
electrocardiography; haemodynamics; medical signal processing; muscle; spectral analysis; 0.00001 to 0.01 Hz; 1 month; 1/f spectrum; 24 hr; 48 hr; Holter recording; acute myocardial infarction; beat to beat variability signal; daily physical activity; frequency range; healthy subjects; long term heart rate variability; physiological meaning; power law; power spectrum density estimation; surface ECG; time scale; Ambient intelligence; Chaos; Electrocardiography; Fractals; Frequency estimation; Hafnium; Heart rate; Heart rate variability; Myocardium; Wideband;
Conference_Titel :
Computers in Cardiology 1995
Conference_Location :
Vienna
Print_ISBN :
0-7803-3053-6
DOI :
10.1109/CIC.1995.482585
