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Description of main frequency-domain HRV measurements reviewed.
| Parameter | Description |
|---|---|
| LF, HF, VLF, ULF | Ranges of the spectral components of the HRV |
| LF: low frequency (0.04–0.15 Hz) | |
| HF: high frequency (0.15–0.4 Hz) VLF: very low frequency (0.0033–0.04 Hz) ULF: ultra-low frequency (<0.0033 Hz) | |
| LF/HF | Ratio between LF and HF bands. |
| TP | Total power and includes all the bands together (<0.4 Hz). |
