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Related Experiment Videos

[A decrease in twin births and factors involved in multiple pregnancy].

N G Lipovetskaia, Iu A Iampol'skaia

    Genetika
    |April 1, 1975
    PubMed
    Summary

    The frequency of twin births has declined due to hormonal changes associated with puberty acceleration. This trend is more pronounced in women with a tendency for polyembryony, affecting their first menstruation timing.

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    [Physical development of schoolchildren in the city of Moscow during the recent decade and a related assessment].

    Vestnik Rossiiskoi akademii meditsinskikh nauk·2003

    Area of Science:

    • Reproductive biology
    • Human reproduction
    • Demographic trends

    Context:

    • Twin birth frequency in Moscow declined from 1.19% in 1956 to 0.7% in 1973.
    • An increase in first births and very young mothers was observed.
    • These demographic shifts disproportionately affected women with a tendency for polyembryony.

    Purpose:

    • To investigate the causes behind the decreasing frequency of twin births over the past two decades.
    • To analyze demographic factors influencing twin birth rates.
    • To explore the role of puberty acceleration and hormonal changes.

    Summary:

    • The study observed a decrease in twin birth frequency, linked to an increase in first births and younger mothers.
    • Puberty acceleration, while general, showed a delayed onset of first menstruation in women prone to polyembryony.
    • Hormonal shifts during puberty acceleration are hypothesized as a primary cause for reduced twin births.

    Impact:

    • Identifies potential etiological factors for declining twin birth rates.
    • Highlights the influence of demographic and physiological changes on reproductive outcomes.
    • Provides insights into factors affecting women with a predisposition to polyembryony.

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