Table 2 DLMO and sleep/wake time before and after intervention in each group
From: Intake of l-serine before bedtime prevents the delay of the circadian phase in real life
| Â | Placebo(n = 17) | l-serine(n = 15) | Â | p value (Before intervention, between groups) | |||
|---|---|---|---|---|---|---|---|
Before intervention | After intervention | p value (before vs. after) | Before intervention | After intervention | p value (before vs. after) | ||
DLMO | 22:56 ± 1:11 | 23:22 ± 0:52 | p = 0.02* | 22:29 ± 1:06 | 22:23 ± 0:56 | p = 0.62 | p = 0.26 |
Bedtime | 1:29 ± 0:50 | 1:37 ± 0:39 | p = 0.21 | 1:16 ± 0:54 | 1:43 ± 0:39 | p = 0.13 | p = 0.47 |
Wake time | 8:45 ± 1:06 | 8:59 ± 0:55 | p = 0.16 | 8:32 ± 0:54 | 8:48 ± 0:32 | p = 0.30 | p = 0.55 |
Time in bed [h] | 7.27 ± 0.86 | 7.36 ± 0.71 | p = 0.53 | 7.28 ± 0.61 | 7.09 ± 0.73 | p = 0.24 | p = 0.98 |