scholarly journals Linear and/or nonlinear behavior of heart rate? A comparative study using Lyapunov exponents, fractal dimension, conditional entropy and spectral analysis

2003 ◽  
Author(s):  
A. Ripoli ◽  
L. Zyw ◽  
C. Passino ◽  
M. Emdin
Keyword(s):  
Heart Rate ◽  
Spectral Analysis ◽  
Fractal Dimension ◽  
Comparative Study ◽  
Lyapunov Exponents ◽  
Nonlinear Behavior ◽  
Conditional Entropy

Heart rate variability and fractal dimension during orthostatic challenges

1993 ◽  
Vol 75 (6) ◽  
pp. 2602-2612 ◽  
Author(s):  
G. C. Butler ◽  
Y. Yamamoto ◽  
H. C. Xing ◽  
D. R. Northey ◽  
R. L. Hughson
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Analysis ◽  
Fractal Dimension ◽  
Cardiovascular System ◽  
Lower Body Negative Pressure ◽  
Broad Band ◽  
Coarse Graining ◽  
Noise Spectrum ◽  
Four Levels

Heart rate variability (HRV) spectral analysis has been used as a tool for short-term assessment of parasympathetic (PNS) and sympathetic nervous system (SNS) control of heart rate. However, it has been suggested that the PNS and SNS indicators are superimposed on a broad-band noise spectrum in which the power spectral densities are inversely proportional to their frequency (1/f beta). In this study, we have used coarse-graining spectral analysis to extract the harmonic components for calculation of PNS and SNS indicators and to obtain the slope (beta) of the 1/f beta component to estimate fractal dimension (DF) of a trail of HRV. DF was regarded as an indicator of cardiovascular system complexity. Ten healthy young subjects (6 women and 4 men) were studied in supine rest and with sequential applications of four levels of lower body negative pressure (LBNP; -10, -20, -30, and -50 mmHg) and head-up tilt (HUT; 10, 20, 30, and 70 degrees). In the 20 tests, there were six occurrences of presyncopal symptoms that required the test to be terminated before the planned end point. At low levels of LBNP or HUT, arterial pulse pressure (PP) was not changed from rest, and calculated DF was very high (beta approximately 1.00). At the higher levels of LBNP and HUT, PP decreased. Coincident with this reduction in PP, PNS activity decreased, SNS activity increased, and DF was reduced, each with a significant linear relationship to the change in PP (PNS: r = 0.56; SNS: r = 0.57; DF: r = 0.70, P < 0.01). Each occurrence of presyncope was associated a low PNS indicator as well as DF < 2.50 (beta > or = 1.80). These data indicate that the cardiovascular system is operating at a reduced level of complexity and further suggest that reduced complexity might not be compatible with cardiovascular homeostasis.

Comparative study on Spectral analysis of heart rate variability in hyperthyroid patients and euthyroids

2015 ◽  
Vol 5 (2) ◽  
pp. 93
Author(s):  
Rashmi Ramanathan ◽  
Manishankar Subramanian ◽  
Nagashree Ramasamy ◽  
Pushparaj Thangaraj ◽  
Jeyabanu Murugaiyan ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Analysis ◽  
Comparative Study ◽  
Hyperthyroid Patients

scholarly journals Role of increased sympathetic activity in the genesis of ambulatory ischemia: Spectral analysis of heart rate variability

1996 ◽  
Vol 27 (2) ◽  
pp. 398-399
Author(s):  
Tohru Kaji ◽  
Tetsuro Kohya ◽  
Fumishi Tomita ◽  
Tomohide Ono ◽  
Akira Kitabatake
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Spectral Analysis ◽  
Sympathetic Activity
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