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| Parameter | Unit | Description |
|---|---|---|
| SDNN | ms | Standard deviation of the normal-to-normal sinus node-initiated J-J intervals |
| SDANN | ms | Standard deviation of average J-J intervals for each 5 min segment of 24 hours HRV |
| LF | ms2 | Absolute power of the low-frequency band (0.04~0.15 Hz) |
| HF | ms2 | Absolute power of the high-frequency band (0.15~0.4 Hz) |
