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Table 2 ECG and locomotor activity of the fetus in "quiet" hours (4 a.m. to 9 a.m., 2 p.m. to 7 p.m.) (36 – 40 weeks gestation)

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

Time (h) Type Duration Time (h) Duration
   Oscillation type Fetal movements Recording   Oscillation type Fetal movements Recording
   Min. Sec. Min. Sec. Min.   Min. Sec. Min. Sec. Min.
4–5 I - 20 ± 0.2 - - 54 ± 0.3 14–15 - 10 ± 0.2 - - 40 ± 0.4
  II 16 ± 0.3 - - 50 ± 0    3 ± 0.4 - - 50 ± 0.1  
  III 20 ± 0.2 - - -    30 ± 0.4 - - -  
  IV 18 ± 0.2 - - -    7 ± 0.1 - - -  
5–6 I - - 1 ± 0.1 - 46 ± 0.2 15–16 1 ± 0.2 - - - 54 ± 0.3
  II 7 ± 0.4 - - -    7 ± 0.2 - 2 ± 0.1 -  
  III 30 ± 0.3 - - -    24 ± 0.1 - - -  
  IV 9 ± 0.3 - - -    21 ± 0.2 - - -  
6–7 I - 30 ± 0.2 - - 59 ± 0.2 16–17 - 20 ± 0.3 - - 45 ± 0.1
  II 18 ± 0.1 - 1 30 ± 0.3    12 ± 0.1 - 1 ± 0.3 -  
  III 26 ± 0.1 - - -    21 ± 0.1 - - -  
  IV 15 ± 0.2   - -    11 ± 0.1 - - -  
7–8 I - 50 ± 0.1 - - 50 ± 0.5 17–18 - 20 ± 0.1 - - 45 ± 0.3
  II 12 ± 0.4 - - -    8 ± 0.2 - 1 50 ± 0.1  
  III 22 ± 0.4 - 1 5 ± 0.1    20 ± 0.1 - - -  
  IV 15 ± 0.3 - - -    16 ± 0.1 - - -  
8–9 I - 20 ± 0.1 - - 40 ± 0.2 18–19 - 10 ± 0.1 - - 42 ± 0.1
  II - - - 50 ± 0.1    4 ± 0.3 - - 40 ± 0.2  
  III 28 ± 0.3 - - -    25 ± 0.2 - - -  
  IV 12 ± 0.3 - - -    12 ± 0.3 - - -