How menstrual cycles relate to women's health in southern France
Official title: Understanding Socio-ecological Variation in Menstrual Cycles to Advance Female Health
Run by University Hospital, Montpellier · NCT07037082 · Data updated 2026-11-12
This research will try to see if environmental and socioeconomic differences between rural and urban areas of southern France change luteal progesterone levels and menstrual symptoms in women of reproductive age.
Quick facts
| Study type | Observational |
|---|---|
| Ages | 18 Years to 39 Years |
| Sex | Women only |
| Enrollment | 320 (estimated) |
| Sponsor | University Hospital, Montpellier Academic / other |
| Locations | 1 site (Montpellier) |
| Status | Recruiting |
| Started | September 1, 2025 |
| Main results expected | July 1, 2029 |
| Study ends | July 1, 2029 |
| Registry record updated | June 22, 2026 |
| Trial ID | NCT07037082 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal candidates are healthy women aged 18–39 who have not used hormonal contraception for at least six months, have semi-regular cycles (21–45 days), live and work in the same rural or urban area in Occitanie, can perform self-sampling, and have access to a -20°C freezer.
✕Probably not a fit
Women with diagnosed conditions such as PCOS, endometriosis, major chronic diseases, current hormonal contraception use, irregular cycles, infertility history, or those living outside Occitanie are unlikely to gain direct benefit from participation.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
The C-HEALTH project is a prospective observational cohort enrolling 320 healthy women aged 18–39 in Occitanie divided into four groups by income and rural/urban residence. Participants will collect daily salivary hormones (progesterone, estradiol), provide dried blood spots for CRP five times per cycle, use ovulation tests, wear a smart ring for temperature and activity monitoring, and log daily symptoms and lifestyle factors. Environmental exposures such as pollution, stress, and living conditions will be characterized and linked to hormonal, inflammatory, and menstrual cycle outcomes. The primary comparison is luteal-phase progesterone across socioeconomic and location groups, with secondary analyses of estradiol, CRP, cycle characteristics, and exposure associations.
Why it matters
Potential benefit: If successful, the findings could reveal environmental or social factors that influence menstrual hormones and symptoms and inform prevention, public health measures, and tailored patient guidance.
How similar studies have gone: Prior research has linked environmental exposures to menstrual outcomes, but combining daily salivary hormones, serial dried-blood CRP, wearable physiological data, and detailed socioeconomic/rural–urban grouping is relatively novel.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria: * Woman of childbearing age (18-39 years) * Woman not using hormonal contraception for at least 6 months * Woman with semi-regular menstrual cycles between 21 and 45 days inclusive * Woman with no known history of infertility * Woman working in the same environment (urban/rural) as her place of residence * Knowledge of the dates of periods over the last 3 cycles * Woman who has a freezer at -20°C Exclusion Criteria: * Diagnosis by a physician of one or more of the following comorbidities: Polycystic ovarian syndrome (PCOS), Endometriosis, Adenomyosis, Diabetes or thyroid disease, Hormone-dependent gynecological cancers (breast, endometrium, ovaries), Coagulation diseases (von Willebrand), Chronic liver failure, chronic renal failure, heart disease, autoimmune disease, Autism, Diagnosis and/or treatment for a psychiatric illness * Chronic exposure to cocaine, amphetamine/methamphetamine, morphine or ecstasy within 30 days prior to inclusion * Chronic exposure to THC within 7 days prior to inclusion. * Person who is not comfortable with self-sampling (hematophobia or other) * No access to a smartphone * No possibility of wearing a connected ring for at least 60 days 22h/24h * Pregnant or breastfeeding woman * Woman who gave birth or breastfed in the 2 months before the study * Person who moved less than 2 years before the study (does not concern participants who moved in the same environment (rural or urban, less than 20 km) * Person unable to read French * Failure to obtain informed consent * Person not benefiting from a national health insurance scheme * Person under legal protection, guardianship or curatorship * Person participating in other research involving the human person
Where it's running
-
Institute of Evolutionary Science of Montpellier
Montpellier, France Recruiting
Study contacts
- Study coordinator: Alexandra ALVERGNE, PhD
- Email: alexandra.alvergne@umontpellier.fr
- Phone: +33467144966
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.