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Overnight heart rate and heart rate variability parameters
| Variable | CFS (n = 11) | Healthy (n = 12) | P-value |
|---|---|---|---|
| HR (bpm) | 66 (10) | 66 (7) | 0.97 |
| RMSSD | 34.1 (16.5) | 68.4 (46.5) | 0.03 |
| LF (%) | 19.6 (5.9) | 21.3 (6.4) | 0.50 |
| HF (%) | 10.3 (7.3) | 35.7 (19.2) | 0.002 |
| LF/HF ratio | 2.44 (1.07) | 0.84 (0.58) | 0.002 |
Values are group means (standard deviations). HR, heart rate; RMSSD, root mean squared of successive RR intervals; LF, low frequency (0.04–0.15 Hz); HF, high frequency (0.15–0.40 Hz).
