Initial systolic blood pressure(SBPi) and pulse interval (PIi) at the beginning of sequences and their changes during sequences (ΔSBP, ΔPI) during wakefulness and sleep under no treatment and during acute application of continuous positive airway pressure (CPAP)
| SBPi mmHg | p-value | ΔSBP mmHg | p-value | PIi ms | p-value | Δ PI ms | p-value | |||||
| No treatment | Acute CPAP | No treatment | Acute CPAP | No treatment | Acute CPAP | No treatment | Acute CPAP | |||||
| +PI/+SBP | ||||||||||||
| Nocturnal wakefulness | 128.7±14.2 | 130.5±18.0 | ns | 14.7±2.6 | 11.8±3.6 | <0.05 | 713±88 | 771±123 | <0.05 | 92±39 | 91±36 | ns |
| NREM stage 2 | 129.5±17.9 | 128.6±20.3 | ns | 15.3±2.6 | 11.5±2.9 | <0.005 | 731±97 | 807±137 | <0.01 | 100±37 | 86±32 | ns |
| REM | 144.2±26.8 | 135.5±19.5 | ns | 14.2±5.1 | 10.7±2.8 | ns | 758±115 | 799±123 | ns | 123±66 | 71±35 | ns |
| −PI/−SBP | ||||||||||||
| Nocturnal wakefulness | 140.0±11.4# | 140.7±19.6 | ns | 16.4±3.6 | 11.1±5.5 | <0.05 | 830±105 | 852±99 | ns | 80±33 | 77±40 | ns |
| NREM stage 2 | 141.3±13.6 | 133.3±19.5 | ns | 16.7±4.1 | 10.7±2.9 | <0.0005 | 885±128 | 909±154 | ns | 92±36 | 80±38 | ns |
| REM | 156.0±22.7 | 141.8±20.9 | ns | 19.2±6.4 | 9.8±4.0 | <0.0005 | 909±142 | 899±149 | ns | 97±47 | 66±50 | <0.05 |
p-values: results of paired t-test applied to no treatment and acute CPAP data in the preceding two columns. NREM: nonrapid eye movement; REM: rapid eye movement. #: wakefulness significantly different from NREM stage 2 and REM sleep (differences among sleep stages tested by ANOVA in each group).