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Related Experiment Videos

Is there seasonality in human ovulation?

A M Stolwijk1, F J Aarts, C J Hamilton

  • 1Department of Medical Informatics, Epidemiology, and Statistics, University of Nijmegen, The Netherlands.

Human Biology
|August 1, 1996
PubMed
Summary

This study found no seasonal patterns in human ovulation among subfecund Dutch women. Ovulation frequency remained consistent throughout the year, unaffected by age or other health factors.

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Area of Science:

  • Reproductive Endocrinology
  • Human Physiology
  • Chronobiology

Background:

  • Understanding human reproductive seasonality is crucial for fertility research.
  • Previous studies suggest potential seasonal influences on human reproduction, but direct evidence is limited.
  • Investigating ovulation seasonality can provide insights into female reproductive health.

Purpose of the Study:

  • To directly investigate the presence of seasonal variation in human ovulation.
  • To determine if ovulation patterns differ across months in women with spontaneous menstrual cycles.
  • To assess potential confounding factors influencing ovulation seasonality.

Main Methods:

  • Prospective study of 407 infertile patients with spontaneous menstrual cycles at a Dutch fertility clinic (1991-1992).

Related Experiment Videos

  • Ovulation detection via serial transvaginal ultrasound and midluteal progesterone measurements during a screening cycle.
  • Statistical analysis to evaluate monthly variations in ovulation frequency.

    • Main Results:

    • Ovulation frequency per month ranged from 73% to 93%, with no statistically significant seasonal pattern observed.
    • The study found no evidence of seasonality in ovulation among the studied population.
    • Results were not confounded by patient age, body mass index, or ovulation-influencing disorders.

    Conclusions:

    • Human ovulation does not exhibit a significant seasonal pattern in subfecund women with spontaneous menstrual cycles in the Netherlands.
    • Reproductive seasonality, if present in humans, is not directly evident in ovulation timing in this cohort.
    • Further research may be needed to explore subtle or indirect seasonal influences on human reproduction.