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Table 1 Hourly layout for 24-hour period frequencies of maternal and fetal heart rate rhythms. (36 – 40 weeks gestation)

From: Development of daily rhythmicity in heart rate and locomotor activity in the human fetus

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 **
  1. * p < 0.001 (compared to heart rate at 7 am).
  2. ** p > 0.05.