Table 1.
R-wave to R-wave interval data sets used in the study.
Fig 1.
Differences in heart rate variability (HRV) among different cardiac preparations (baseline conditions).
A to D, Tachograms from: (a) human normal sinus rhythm (n = 72); (b) human congestive heart failure (n = 44);(c) rabbit SANC(sinoatrial node cell; n = 67);(d) conscious rat(n = 11) subjects. Individual experiments are plotted in unique colours. E to J, Summary of baseline differences in cycle length (CL) and HRV among cardiac preparations. Mean (+SEM) CL (E,H), SD of normal beat to normal beat intervals (SDNN; F,I), and root mean square of successive differences (RMSSD) (G,J) for different preparations.
Fig 2.
Differences in heart rate variability (HRV) among different cardiac preparations (baseline conditions) using frequency domain analysis.
A toD, Tachograms from: (a) human normal sinus rhythm (n = 72); (b) human congestive heart failure (n = 44);(c) rabbit SANC(sinoatrial node cell; n = 67);(d) conscious rat(n = 11) subjects. E and F shows the total power among different cardiac preparations.
Fig 3.
Differences in heart rate variability (HRV) among different cardiac preparations (baseline conditions) using Approximate Entropy and Sample Entropy, a nonlinear time series analysis.
Fig 4.
Relationship between HRV metrics (SDNN, RMSSD, total power, approximate entropy, sample entropy) and heart rate.