| Very Low Frequency (VLF) |
ms2
|
Power in VLF (≤0.04 Hz) range |
| Normalized Low Frequency (nLF) |
nu |
LF (0.04-0.15 Hz) Power in normalized units (LF/(total power – VLF) × 100 |
| Normalized High Frequency (nHF) |
nu |
HF (0.15-0.4 Hz) Power in normalized units (HF/(total power – VLF) × 100 |
| LF/HF Ratio |
|
Ratio LF [ms2]/HF[ms2] |
| RMSSD |
ms |
The square root of the mean of the sum of the squares of differences between adjacent RR intervals |
| Standard Deviation RRIDX |
ms |
Mean of the standard deviations of all RR intervals for all 5-minute segments of the recording period |
| Sample Entropy |
|
Measure of time series complexity that is small for low variability and large for high variability sequences |
| 1 / f |
|
Slope of the linear interpolation of the spectrum in a log-log scale (≈≤0.04 Hz) |
