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Heart rate variability variables analyzed.
| Variable | Explanation |
|---|---|
| HR (l/min) | Average heart rate |
| RMSSD (ms) | The root mean square of successive differences between normal heartbeats |
| HF-power (ms2) | Average power of high frequency heart rate variability (0.15–0.40 Hz) |
| LF-power (ms2) | Average power of low frequency heart rate variability (0.04–0.15 Hz) |
| LF/HF-ratio | Ratio of low and high frequency heart rate variability (LF-power/HF-power) |
