Table 1

Hourly layout for 24-hour period frequencies of maternal and fetal heart rate rhythms. (36 – 40 weeks gestation)
Time of day (h)
 Mother (bpm)
 Fetus (bpm)
7 – 8
 66.5 ± 1.3 *
 133 ± 1.9 **
8 – 9
 68 ± 1.2 *
 133 ± 2.1 **
9 – 10
 68.5 ± 1.3 **
 132 ± 2.0 **
10 – 11
 72 ± 1.4 **
 136 ± 2.1 **
11 – 12
 76 ± 1.4 **
 135 ± 2.3 **
12 – 13
 79 ± 1.3 *
 136 ± 2.3 **
13 – 14
 79 ± 1.2 *
 134 ± 1.9 *
14 – 15
 75 ± 1.2 *
 136 ± 2.1 **
15 – 16
 76 ± 1.1 *
 133 ± 2.3 *
16 – 17
 76 ± 1.1 *
 132 ± 1.8 **
17 – 18
 76.5 ± 1.2 *
 133 ± 2.2 **
18 – 19
 79 ± 1.0 *
 135 ± 1.8 **
19 – 20
 71 ± 1.1 *
 131 ± 1.8 *
20 – 21
 72 ± 1.1 **
 133 ± 2.0 *
21 – 22
 69 ± 1.2 *
 135 ± 1.9 **
22 – 23
 70 ± 1.1 *
 134 ± 1.8 **
23 – 24
 65 ± 1.0 *
 136.5 ± 2.0 **
24 – 1
 64 ± 1.2 *
 138.5 ± 1.9 *
1 – 2
 65 ± 1.1 *
 138.5 ± 2.2 *
2 – 3
 61 ± 1.2 *
 133.5 ± 1.9 **
3 – 4
 64 ± 1.1 *
 136 ± 1.8 **
4 – 5
 62 ± 1.1 *
 132 ± 1.9 **
5 – 6
 66.5 ± 1.1 *
 133 ± 2.1 **
6 – 7
 68 ± 1.0 *
 134 ± 2.2 **

* p < 0.001 (compared to heart rate at 7 am).

** p > 0.05.

Kintraia et al. Journal of Circadian Rhythms 2005 3:5   doi:10.1186/1740-3391-3-5