Table 2.
Circadian profile of CBT and salivary melatonin at the MF and ML phases of the menstrual cycle
| MF (n = 8) | ML (n = 8) | P-value | |
|---|---|---|---|
| CBT amplitude (°C)a | 0.31 ± 0.03 | 0.23 ± 0.03 | 0.01 |
| CBT fitted minimum (clock time) | 04:34 ± 00:25 | 04:20 ± 00:22 | 0.40 |
| DLMOn (clock time) | 22:13 ± 00:32 | 22:49 ± 00:24 | 0.28 |
| DLMOff (clock time) | 08:10 ± 00:25 | 08:16 ± 00:31 | 0.91 |
| Melatonin duration of secretion (hours) | 09:57 ± 00:46 | 09:26 ± 00:27 | 0.62 |
| Melatonin midpoint (clock time) | 03:11 ± 00:18 | 03:32 ± 00:25 | 0.43 |
| Melatonin AUC (24-h) | 228.97 ± 30.00 | 164.11 ± 42.00 | 0.30 |
| Melatonin amplitude (pg/mL) | 6.34 ± 1.27 | 7.75 ± 1.51 | 0.22 |
| Melatonin fitted maximum (clock time) | 03:14 ± 00:59 | 04:16 ± 00:45 | 0.32 |
CBT, core body temperature; DLMOn, dim light melatonin onset; DLMOff, dim light melatonin offset; AUC, area under the curve
All values are mean ± SEM;P-values provided for 2-tailed paired-samples t-tests
a
indicates significant menstrual phase difference by paired-samples t-test (P < 0.05)