Table 1 Overview of all features calculated in this study
Name | Description |
|---|---|
AVNN | Average of the NN intervals |
SDNN | Standard deviation of the NN intervals |
RMSSD | Root mean square of successive differences |
NN50 | Number of NN intervals 50 ms |
pNN50 | Percentage of NN intervals 50 ms |
CV | Coefficient of variation (SDNN divided by AVNN) |
SampEn | Sample entropy |
SD1 | Standard deviation in the first direction of a Poincaré plot |
SD2 | Standard deviation in the second direction of a Poincaré plot |
ULF | Ultra-low frequency power (bandwidth: < 0.003 Hz) |
VLF | Very low frequency power (bandwidth: 0.0033–0.04 Hz) |
LF | Low frequency power (bandwidth: 0.04–0.15 Hz) |
HF | High frequency power (bandwidth: 0.15–0.4 Hz) |
Total power | Total frequency power (sum of LF and HF) |
LFnorm | LF normalized to total power |
HFnorm | HF normalized to total power |
LF/HF-ratio | Ratio of LF to HF |