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Related Experiment Videos

Normal patterns of fetal activity in the third trimester

A B Roberts, D Little, D Cooper

    British Journal of Obstetrics and Gynaecology
    |January 1, 1979
    PubMed
    Summary

    Fetal respiratory movements (FRM) and fetal trunk movements (FTM) show circadian variations in normal pregnancies. Total fetal activity is a potentially more reliable indicator of fetal well-being than individual movement types.

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    Area of Science:

    • Perinatology
    • Fetal Physiology
    • Obstetrics

    Background:

    • Fetal movements are crucial indicators of well-being.
    • Understanding circadian patterns of fetal activity is important for clinical assessment.

    Purpose of the Study:

    • To quantify fetal respiratory movements (FRM) and fetal trunk movements (FTM) in normal pregnancies.
    • To investigate the circadian variation in fetal activity.
    • To assess the clinical utility of total fetal activity as a measure of fetal well-being.

    Main Methods:

    • Real-time ultrasound was used to record FRM and FTM in 21 pregnancies (28-39 weeks).
    • Recordings were conducted for one hour, three times daily over 24 hours (168 hours total).
    • Fetal movements were digitized for analysis.

    Main Results:

    • Mean FRM incidence was 31% (43 breaths/min); mean FTM incidence was 18% (29 moves/30 min).
    • FRM peaked 1900-2200h, FTM peaked 2200-0100h, indicating circadian variation.
    • Total fetal activity rarely dropped below 10%, suggesting its potential as a robust clinical marker.

    Conclusions:

    • Fetal activity exhibits distinct circadian rhythms.
    • Total fetal activity may offer a more reliable assessment of fetal well-being compared to FRM or FTM alone.
    • Further research is warranted to validate total fetal activity as a clinical tool.

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