Table 4.
Differences in mean values of HRV parameters between good and poor sleepers.
| HRV Parameter | Good Sleepers | Poor Sleepers | t | p |
|---|---|---|---|---|
| Mean (SD) | Mean (SD) | |||
| Time domain | ||||
| Heart rate (bpm) | 83.22 (10.92) | 77.76 (12.03) | 1.25 | 0.601 |
| SDNN (ms) | 49.85 (16.61) | 47.24 (18.37) | 0.39 | 0.732 |
| RMSSD (ms) | 36.21 (14.62) | 38.36 (19.76) | −0.30 | 0.974 |
| Frequency domain | ||||
| LF (ms2) | 723.39 (666.76) | 1396.57 (1171.06) | −2.36 | <0.0001 |
| TP (ms2) | 2975.14 (1652.76) | 1686.39 (1110.46) | 2.87 | <0.0001 |
| HF (ms2) | 535.44 (491.08) | 502.42 (273.41) | 0.19 | 0.209 |
| LF/HF | 1.51 (3.27) | 0.10 (0.36) | 1.72 | 0.882 |
SDNN: standard deviation of normal to normal HRV; RMSSD: root mean square of the successive difference in HRV; TP: total power HRV; LF: low-frequency HRV; HF: high-frequency HRV; LF/HF: low-frequency power to high-frequency power ratio. PSQI global score, good sleepers had PSQI < 5 and poor sleepers had PSQI ≥ 5; ms: millisecond; BPM: beats per minute; SD: standard deviation.