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The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
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The female reproductive system can be affected by several disorders, including Premenstrual Syndrome (PMS), Premenstrual Dysphoric Disorder (PMDD), endometriosis, and various forms of cancer. PMS and PMDD are cyclical conditions that cause physical and emotional distress, with symptoms that include edema, mood swings, and food cravings. PMDD is a more severe form of PMS characterized by increased symptom severity that peaks during the luteal phase and tends to improve or resolve shortly after...
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Can atmospheric pollutants influence menstrual cycle function?

L Giorgis-Allemand1, J C Thalabard2, L Rosetta3

  • 1Team of Environmental Epidemiology Applied to Reproduction and Respiratory Health, Inserm, CNRS, University Grenoble Alpes, Institute of Advanced Biosciences, Joint Research Center (U1209), Grenoble (La Tronche), France; Université Lyon, Université Claude Bernard Lyon 1, Ifsttar, UMRESTTE, UMR T_9405, Bron, France.

Environmental Pollution (Barking, Essex : 1987)
|December 7, 2019
PubMed
Summary
This summary is machine-generated.

Exposure to air pollutants like nitrogen dioxide and PM10 may lengthen the follicular phase of the menstrual cycle. This study suggests short-term effects of atmospheric pollutants on reproductive health, specifically impacting cycle timing.

Keywords:
Atmospheric pollutantsFecundityMenstrual cycleNitrogen dioxideParticulate matter (PM)

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Area of Science:

  • Environmental Health
  • Reproductive Endocrinology
  • Epidemiology

Background:

  • Emerging evidence suggests atmospheric pollutants may disrupt the endocrine system, potentially affecting the hypothalamic-hypophyseal-ovarian axis and menstrual cycle function.
  • Previous studies have primarily been experimental, with limited prospective human data on the short-term impacts of air pollution on menstrual cycle dynamics.

Purpose of the Study:

  • To investigate the potential short-term effects of specific atmospheric pollutants, nitrogen dioxide (NO2) and particulate matter (PM10), on the duration of the follicular and luteal phases of the human menstrual cycle.
  • To quantify the association between estimated pollutant exposure levels and changes in menstrual cycle phase lengths.

Main Methods:

  • A prospective cohort study involving 184 women not using contraception, who provided daily urine samples for progesterone metabolite analysis to determine follicular and luteal phase lengths.
  • Atmospheric pollution levels (NO2 and PM10) were estimated using a 1-km resolution dispersion model integrated with monitoring station data.
  • Exposure assessment focused on the 30-day, 1-10 day, and 11-30 day periods preceding the menstrual cycle start, with regression models used for analysis, adjusting for confounders.

Main Results:

  • Increased exposure to NO2 (10 μg/m³) averaged over 30 days before the cycle was associated with a 0.7-day increase in follicular phase duration (95% CI, 0.2; 1.3).
  • Similarly, a 10 μg/m³ increase in PM10 over 30 days was linked to a 1.6-day increase in follicular phase duration (95% CI, 0.3; 2.9).
  • No significant associations were found between pollutant exposure and luteal phase or total cycle duration, though short-term exposures (1-10 days prior) also showed links to increased follicular phase length.

Conclusions:

  • This prospective study provides some of the first human evidence suggesting that short-term exposure to atmospheric pollutants, specifically NO2 and PM10, can alter follicular phase duration.
  • The findings highlight a potential environmental impact on reproductive timing and warrant further investigation into the mechanisms and long-term consequences of air pollution on female reproductive health.