Table 3.
Electroencephalographic spectral power (μV2.Hz-1) for delta (0.3-≤4 Hz), theta (4-≤8 Hz), alpha (8-≤12 Hz), sigma (12-≤15 Hz), beta1 (15-≤23Hz) and beta2 (23-≤30Hz) bands during artifact-fee epochs of NREM (N2+N3) sleep across first, second and third 2-h periods on baseline and anticipatory stress nights in perimenopausal women with (N=21) and without (N=17) insomnia.
| Group |
Baseline night Mean (SD) |
Stress night Mean (SD) |
Significant ANOVA
effects |
||||||
|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||
| 0-2h | 2-4h | 4-6h | 0-2h | 2-4h | 4-6h | ||||
|
Delta (μV2.Hz−1) |
Control | 120.5 (58.4) | 99.9 (46.8) | 61.4 (25.9) | 107.2 (48.6) | 111.1 (69.1) | 65.8 (29.8) | ◀ | Time *** |
| Insomnia | 117.0 (71.5) | 100.2 (64.9) | 63.3 (28.8) | 135.8 (90.1) | 114.4 (60.0) | 69.2 (39.7) | |||
|
| |||||||||
|
Theta (μV2.Hz−1) |
Control | 9.0 (4.0) | 8.2 (4.1) | 7.0 (4.0) | 9.1 (4.3) | 8.3 (4.3) | 7.0 (4.0) | ◀ | Time *** |
| Insomnia | 9.1 (4.1) | 7.8 (3.5) | 6.5 (2.8) | 9.8 (4.8) | 8.6 (3.9) | 7.2 (3.4) | |||
|
| |||||||||
|
Alpha (μV2.Hz−1) |
Control | 4.8 (4.1) | 4.6 (4.0) | 4.4 (3.5) | 4.8 (4.0) | 4.5 (4.1) | 4.2 (3.2) | ◀ |
Time***
and Night × Group* |
| Insomnia | 4.8 (2.7) | 4.2 (2.3) | 4.0 (2.4) | 5.1 (2.8) | 4.6 (2.7) | 4.4 (2.4) | |||
|
| |||||||||
|
Sigma (μV2.Hz−1) |
Control | 2.6 (1.1) | 2.4 (1.2) | 2.6 (1.2) | 2.6 (1.1) | 2.4 (1.0) | 2.6 (1.3) | ◀ | Time *** |
| Insomnia | 2.5 (1.2) | 2.3 (1.2) | 2.6 (1.5) | 2.9 (1.8) | 2.7 (1.9) | 3.0 (1.9) | |||
|
| |||||||||
|
Beta1 (μV2.Hz−1) |
Control | 0.39 (0.17) | 0.38 (0.19) | 0.43 (0.19) | 0.39 (0.15) | 0.37 (0.15) | 0.38 (0.16) | ◀ |
Time**
and Night × Group** |
| Insomnia | 0.39 (0.16) | 0.38 (0.18) | 0.43 (0.21) | 0.46 (0.21) | 0.45 (0.24) | 0.51 (0.26) | |||
|
| |||||||||
|
Beta2 (μV2.Hz−1) |
Control | 0.12 (0.05) | 0.11 (0.04) | 0.12 (0.05) | 0.12 (0.04) | 0.12 (0.04) | 0.11 (0.04) | ◀ | Time ** |
| Insomnia | 0.12 (0.06) | 0.11 (0.04) | 0.13 (0.06) | 0.13 (0.05) | 0.12 (0.06) | 0.13 (0.06) | |||
*
, p<0.05;
**
, p<0.01;
***
, p<0.001. All analyses based on log-transformed data.