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  • Title: Spectral analysis of fetal heart rhythm in relation to fetal regular mouthing.
    Author: van Woerden EE, van Geijn HP, Caron FJ, Mantel R.
    Journal: Int J Biomed Comput; 1990 May; 25(4):253-60. PubMed ID: 2194978.
    Abstract:
    Fetal heart rate variation during fetal regular mouthing in behavioural state 1F was investigated applying spectral analysis. Periods with and without fetal regular mouthing movements were compared. The power spectrum of the periods with regular mouthing movements showed a peak at the frequency of the clusters of mouthing movements which was absent in the power spectrum of the corresponding periods without movements. The oscillations in the fetal heart rate associated with this peak in the power spectrum were detectable both in the heart rate tracings obtained from the abdominal electrocardiogram and those recorded by means of wide range Doppler ultrasound.
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