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Nitrogen balance studies in human pregnancy

F D Johnstone, D M Campbell, I MacGillivray

    The Journal of Nutrition
    |November 1, 1981
    PubMed
    Summary

    Pregnant women retain adequate nitrogen for fetal growth, with no evidence of maternal protein storage. This nitrogen balance study in primigravidae found intake correlated with retention, but not birth weight or pre-eclampsia.

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    Area of Science:

    • Obstetrics and Gynecology
    • Human Nutrition
    • Maternal-Fetal Medicine

    Background:

    • Understanding maternal nitrogen metabolism is crucial for optimizing pregnancy outcomes.
    • Previous studies suggested potential maternal protein storage during late gestation, but evidence was inconclusive.

    Purpose of the Study:

    • To assess nitrogen balance and retention in primigravidae between 30 and 34 weeks of gestation.
    • To investigate the relationship between nitrogen retention, birth weight, and pre-eclampsia incidence.
    • To determine if maternal protein storage occurs during this period.

    Main Methods:

    • A 12-day nitrogen balance study was conducted with 68 primigravidae.
    • Standardized hospital diets, quantitatively equivalent to home diets, were provided and fully consumed.
    • Nitrogen intake and retention were meticulously measured.

    Main Results:

    • A significant positive correlation was observed between nitrogen intake and apparent nitrogen retention.
    • No significant relationship was found between apparent nitrogen retention and birth weight or pre-eclampsia.
    • The mean apparent nitrogen retention was 1.2 g/day, aligning with estimated fetal and reproductive tissue growth needs after accounting for integumental losses.

    Conclusions:

    • Maternal nitrogen retention during late pregnancy is primarily directed towards fetal and reproductive tissue growth.
    • There is no evidence supporting significant maternal storage of surplus protein during this gestational period.
    • Findings challenge previous suggestions of maternal protein accretion and highlight the direct utilization of nitrogen for fetal development.

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