HRV measures during quiet and active sleep comparing prone and supine sleeping positions
| No of subjects | Mean (SD) heart rate bpm | Mean (SD) R-R (ms) | Mean (SD) ΔR-R (ms) | Aspect ratio (SD) | |
|---|---|---|---|---|---|
| Quiet sleep | |||||
| Prone | 37 | 129.4 (9.3) | 16.30 (7.1)** | 14.06 (8.8)1-150 | 1.36 (0.6) |
| Supine | 37 | 123.2 (9.4) | 20.99 (8.0) | 18.19 (9.2) | 1.32 (0.4) |
| Active sleep | |||||
| Prone | 35 | 130.7 (8.8) | 27.23 (8.6)** | 14.87 (6.5)1-150 | 1.96 (0.5) |
| Supine | 34 | 127.2 (8.7) | 32.89 (9.7) | 17.22 (7.5) | 1.92 (0.6) |
↵1-150 p<0.05; **p< 0.001 prone vs supine.