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Exercise during pregnancy: effects on the fetus

E Dale, K M Mullinax, D H Bryan

    Canadian Journal of Applied Sport Sciences. Journal Canadien Des Sciences Appliquees Au Sport
    |June 1, 1982
    PubMed
    Summary

    Running during pregnancy showed no significant differences in birth weight or maternal weight gain. However, some fetal heart rate changes were observed during exercise, which were reversible.

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    Area of Science:

    • Obstetrics and Gynecology
    • Sports Medicine
    • Neonatal Health

    Background:

    • The impact of running during pregnancy on maternal and neonatal outcomes requires further investigation.
    • Previous studies have yielded mixed results regarding the safety and effects of maternal exercise.

    Purpose of the Study:

    • To evaluate the effects of running during pregnancy on obstetric and neonatal outcomes.
    • To assess maternal and fetal heart rate responses during exercise in pregnant runners.

    Main Methods:

    • Retrospective and longitudinal obstetric and neonatal evaluations of 33 pregnant runners and 11 controls.
    • Simultaneous electronic monitoring of maternal and fetal heart rate during treadmill exercise.

    Main Results:

    • No significant differences in maternal weight gain or neonatal delivery weight between runners and controls.
    • Fewer quantitative labor complications in runners, but a potential qualitative trend towards failure to progress and cesarean sections.
    • Transient fetal bradycardia observed during exercise, which resolved during the exercise period, indicating reversibility.

    Conclusions:

    • Running during pregnancy appears safe concerning birth weight and maternal weight gain.
    • Further research is needed to understand the etiology of transient fetal bradycardia during exercise.
    • The potential trend towards labor complications in runners warrants careful consideration and monitoring.

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