ClinicalTrials.gg
RecruitingNCT04893226Updated Aug 10, 2026

Circadian Rhythms in Postmenopausal Women

An interventional study of Time-Restricted Feeding (TRF) in Metabolic Syndrome and Postmenopausal Symptoms, sponsored by Julie Pendergast. Recruiting at 1 site in United States. Open to female participants aged 45 Years to 65 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-08-10.

Sponsored by Julie Pendergast · Not applicable, Interventional, and Prevention

From the registry’s dates

  • Started Oct 2021; still recruiting 5 years later.
Phase
Not applicable
Study type
Interventional
Enrollment
164
Allocation
Randomized
Ages
45 Years to 65 Years
Sex
Female
01

Where this study stands

Counted across the records on this site · 2026-11-12

Among 579 studies in Metabolic Syndrome with a site in United States — 62 open to participants now, 84 under way, 3 of them phase 3. Metabolic Syndrome · United States.

Planned enrollment
75th of 491
164 · median 48
Started
2021
with 17 others
No phase
346 of 579
33 open now
Primary completion
2027-01
later than 28 of 82 live
Registered
466th of 579
by date

Among the 579 studies in Metabolic Syndrome with a site in United States, this one is the 75th largest by planned enrollment of the 491 interventional ones, is one of 18 that started in 2021, is one of 346 with no phase, reaches primary completion later than 28 of the 82 other live ones, and was the 466th registered.

By phase

579 studies; the count open now beside each. This study's row is marked.

No phasethis study346 · 33 open
Observational86 · 12 open
Phase 248 · 3 open
Phase 444 · 5 open
Phase 123 · 5 open
Phase 1/212 · 2 open
Phase 312 · 0 open
Phase 2/38 · 2 open

By the year they started

First in 1982; this study’s year is marked. 18 started in 2021.

Size and results

Median enrollment 48 across the 491 interventional studies, 141 across the 86 observational. Of the 443 that completed or were terminated, 136 (31%) have results posted.

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Watch this landscapeDownload CSVWith an account: a weekly mail of what changed among 579 studies in Metabolic Syndrome with a site in United States, or all of them as a file.
02

Study summary

This is a randomized, parallel two-arm clinical trial design to study the efficacy of time-restricted feeding on metabolic risk in postmenopausal women, who may be particularly vulnerable to disruption of circadian eating rhythms and the associated metabolic dysfunction. It is hypothesized that time-restricted feeding will improve insulin sensitivity, glucose tolerance, body weight, and other metabolic parameters in metabolically-unhealthy postmenopausal women.

Read the detailed description

This is a randomized, parallel two-arm clinical trial design to study the efficacy of time-restricted feeding (TRF) on metabolic risk in postmenopausal women. Data will be collected for 18 weeks. Baseline food timing, activity/sleep, and metabolic parameter (OGTT, body composition, anthropometric measurements, lipid panel, inflammatory markers) data will be collected in the first two weeks (baseline). Subjects will then be randomized to the TRF intervention or no TRF for 16 weeks. Subjects in the TRF group will be educated about the health benefits of TRF. Then each subject in the TRF group will self-select a 10-h window and consume all daily calories during this time frame. Subjects in both the TRF and no TRF groups will text the time of their first and last daily meals for the duration of the study. At the end of the 16-week TRF intervention or no TRF, metabolic and anthropometric measurements will be collected.

03

Conditions studied

  • Metabolic Syndrome
  • Postmenopausal Symptoms

Keywords

  • postmenopause
  • weight
  • metabolic risk
  • glucose
  • body composition
  • lipid
  • sleep
  • prediabetes
  • fasting
  • circadian
  • inflammation
04

Who can participate

Ages eligible
45 Years to 65 Years
Sexes eligible
Female
Accepts healthy volunteers
Yes

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • women
  • age 45-65 years
  • prediabetic or have at least 2 features of metabolic syndrome

Exclusion criteria

Exclusion Criteria:

  • on hormone therapy
  • diabetes
  • heart disease
  • alcohol consumption of >2 drinks per day
  • significant circadian disruption
  • having care-taking responsibilities that significantly affect sleep
  • shift work or irregular lifestyle
  • uncontrolled sleep apnea or other uncontrolled sleep disorder
  • extreme early or late chronotypes
  • significant psychiatric disorders
  • taking ADHD medications
  • diagnosed dysregulated eating behaviors
  • smoking >5 cigarettes/day or 30 pack-year history
  • participating in formal weight loss program
  • not weight stable
Terms in these criteria, in plain language(1)

Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.

Postmenopausal

Periods have stopped for good: usually no period for 12 months in a row without another medical reason, sometimes confirmed by a blood test (FSH).

05

Study design

Phase
Not applicable
Primary purpose
Prevention
Allocation
Randomized
Intervention model
Parallel assignment
Masking
None (open label)
Enrollment
164 participants (estimated)

Study arms

  • No intervention
    Control

    Participants in this group will have baseline and post-study data collected, including food timing, activity/sleep data, and metabolic parameters (OGTT, body composition, anthropometric measurements, lipid panel, inflammatory markers). There will be no intervention.

  • Experimental
    Time-Restricted Feeding (TRF) Group

    Participants in this group will have baseline and post-study data collected, including food timing, activity/sleep data, and metabolic parameters (OGTT, body composition, anthropometric measurements, lipid panel, inflammatory markers). Subjects in this group will be educated about the health benefits of time-restricted feeding (TRF). Then each subject in the TRF group will self-select a 10-h window during which she will consume all daily calories for 16 weeks.

    Behavioral: Time-Restricted Feeding (TRF)

Interventions

  • BehavioralTime-Restricted Feeding (TRF)

    Subjects will be educated about the health benefits of time-restricted feeding (TRF). Each subject in the TRF group will self-select a 10 hour (10h +/- 1hr) window aligned with their active phase during which they will consume all daily calories. Subjects will text the time of their first and last daily meals for the duration of the study.

06

What researchers measure

Primary outcomes

  1. Change in Insulin Sensitivity

    Matsuda index will be assessed by the oral glucose tolerance test (OGTT).

    Time frame: 18 weeks (baseline and post-intervention)

  2. Change in Body Mass Index

    Body mass index will be calculated from height and weight.

    Time frame: 18 weeks (baseline and post-intervention)

  3. Change in Triglycerides

    Triglycerides will be measured from fasting blood

    Time frame: 18 weeks (baseline and post-intervention)

Secondary outcomes

  1. Change in Hemoglobin A1c

    HbA1c is a measure of the proportion of glycated hemoglobin in blood.

    Time frame: 18 weeks (baseline and post-intervention)

  2. Change in C-Reactive Protein

    CRP will be measured from blood samples.

    Time frame: 18 weeks (baseline and post-intervention)

  3. Change in Mid-sleep

    Mid-sleep is a single outcome calculated using both actigraphy and sleep log information.

    Time frame: 18 weeks (baseline and post-intervention)

  4. Change in Sleep Fragmentation Index

    Sleep fragmentation index, a measure of sleep quality, will be assessed from actigraphy data.

    Time frame: 18 weeks (baseline and post-intervention)

07

Study locations

1 of 1 sites recruiting
08

References and documents

Individual participant data

Plan to share: No

No publications or documents are linked to this record.

09

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reachedSimilar studies: half by the dot; the band is the middle halfHalf of similar studies reached it by the dot; the band is the middle half, from a quarter to three quarters

Started Oct 2021 (actual). Primary completion is estimated for Jan 2027, 63 months after the start.

Of 625 non-industry interventional studies with no phase under Metabolic Syndrome, half reached primary completion within 20 months of starting (the median), counting those still running; a quarter within 9 and three quarters within 41. This study's planned 63 months is above that.

Counting every sponsor, half of 675 studies reached it within 20 months; a quarter within 9 and three quarters within 41.

How these figures are worked out, and which studies are left out of them.

Registered
May 12, 2021
First posted
May 19, 2021
StartActual
Oct 19, 2021
Primary completionEst.
Jan 31, 2027
CompletionEst.
Jan 31, 2027
Last update
Aug 10, 2026
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Aug 10, 2026, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04893226
Lead sponsor
Julie Pendergast
Responsible party
Julie Pendergast (Assistant Professor, University of Kentucky) — Sponsor-investigator
First posted
May 19, 2021
Start date
Oct 19, 2021
Primary completion
Jan 31, 2027 (estimated)
Completion
Jan 31, 2027 (estimated)
Last update
Aug 10, 2026

Study contacts

Matt Thomas, PhD
Contact
jmthomg@uky.edu
(859) 218-6770
Julie S Pendergast, PhD
principal investigator · University of Kentucky

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

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