Table 5.
Courses of sleep EEG power in the delta, theta, alpha, and beta bands in the sham and steam-inhalation conditions.
| Normalized EEG | First NREM-REM cycle | Second NREM-REM cycle | Third NREM-REM cycle | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Sham | Steam | p | Sham | Steam | p | Sham | Steam | p | |
| Delta (%) (1–4 Hz) | 89.6 ± 36.0 | 121.0 ± 45.1 | 0.039 | 105.7 ± 34.5 | 103.5 ± 31.3 | 0.972 | 101.3 ± 45.9 | 93.2 ± 22.6 | 0.552 |
| Theta (%) (4–8 Hz) | 90.9 ± 40.1 | 125.1 ± 58.0 | 0.028 | 145.0 ± 44.2 | 135.9 ± 87.2 | 0.421 | 150.2 ± 71.6 | 187.8 ± 95.7 | 0.422 |
| Alpha (%) (8–12 Hz) | 73.8 ± 32.6 | 98.2 ± 44.4 | 0.064 | 104.8 ± 33.9 | 104.5 ± 36.0 | 0.917 | 95.2 ± 42.0 | 94.2 ± 23.1 | 0.807 |
| Beta (%) (16–35 Hz) | 70.7 ± 36.1 | 94.7 ± 61.2 | 0.075 | 95.7 ± 34.9 | 98.6 ± 39.5 | 0.861 | 106.3 ± 46.8 | 101.2 ± 32.3 | 0.753 |
Values are expressed as means ± standard deviations. Comparisons are relative to the sham condition (Wilcoxon signed-rank test).