- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT05829044
Impact of Sex and Age on Non-visual Light Input That Affects Sleep and Circadian Rhythms
The goal of this clinical trial is to learn how the pupil responds to different light stimuli and how that relates to sleep and daily rhythms in healthy people of different ages.
The main questions it aims to answer are:
- Does the eye's pupil response to light stimuli differ by the sex and age of the participant?
- Is the eye's pupil response to light stimuli related to each participant's sleep timing, their body clock timing, and their hormone responses to light.
Participants will have a special eye exam and complete questionnaires before starting the study to see if they can participate. If they can participate, they will wear a special watch that monitors their activity and light levels for one week. Then they will live in a research room at the Mass General Hospital for 3 days/2 nights during which we will test their pupil response to light, their body clock timing, and their hormone responses to light.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Estimated)
Phase
- Not Applicable
Contacts and Locations
Study Contact
- Name: Elizabeth B Klerman, MD PhD
- Phone Number: 617-643-2424
- Email: ebklerman@mgh.harvard.edu
Study Locations
-
-
Massachusetts
-
Boston, Massachusetts, United States, 02114
- Recruiting
- Massachusetts General Hospital
-
Contact:
- Elizabeth Klerman, MD PhD
- Phone Number: 617-726-5199
- Email: mgh_pulsar_study@mgb.org
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
- Adult
- Older Adult
Accepts Healthy Volunteers
Description
Inclusion Criteria:
- (i) 18-85 years old.
- (ii) Habitual sleep onset 10 pm- 1 am;
- (iii) Habitual wake onset 5:30 am- 8:30 am;
- (iv) vision correctable to 20/30;
- (v) stable medically.
- (vi) ability to speak, understand, and read English at a high school level
Exclusion Criteria:
- (i) Color blind by Ishihara Color Blindness Test;
- (ii) any history of eye trauma, surgery or abnormality (e.g., retinopathy, glaucoma, cataracts, amblyopia, macular degeneration, congenital color vision deficiencies, or any type of blindness) besides correctable vision abnormalities (e.g., with glasses); any abnormalities on clinical eye exam (e.g., neuritis, Neuromyelitis optica, treated or untreated glaucoma) such that the ophthalmologist recommends the participant not be studied; Limited cataracts (e.g., Lens Opacities Classification (LOCS) III grade <2) will be allowed and documented during the eye exam. Eye drops that affect pupil size or contractility (e.g. mydriatics, miotics); drops to treat glaucoma (e.g., pilocarpine, brimonidine, other drops like artificial tear drops, or anti-inflammatory drops would not be exclusionary)
- (iii) current or history of neurologic or psychiatric disease including autonomic function disorder or migraines; psychiatric disorder requiring medications in a first degree relative; limited-duration counseling without prescription medications will not be exclusionary; (iv) current or history of circadian rhythm sleep-wake disorder;
- (v) prescription or non-prescription drugs affecting the pupil (e.g., affecting autonomic function), sleep, melatonin (e.g., lithium, alpha- and beta-adrenergic antagonists), and/or circadian rhythms (e.g., beta blockers, non-steroidal anti-inflammatory drugs, tricyclics);
- (vi) Other disorders that can affect or may be affected by intrinsically photosensitive Retinal Ganglion Cell (ipRGC) function, including diabetes mellitus, multiple sclerosis, Parkinson's disease, seasonal affective disorder;
- (vii) shift- or night-work in past three months; history of night work in preceding 3 year period
- (viii) crossing more than 2 time zones in past three months;
- (ix) presence of depression as assessed by a Beck Depression Inventory (BDI) score >14.
- (x) pregnant or less than 6 weeks post-partum or breast-feeding
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Testing non-visual light impacts on pupil response, circadian timing, and hormones
|
Pupillometer measurement of pupil size in response to different light stimuli
Using a light box to produce different wavelengths and intensities of light.
Exposure to red light on Night 1 and blue/green light on Night 2 to determine circadian timing and suppression of hormone (melatonin)
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Pupil size
Time Frame: During pupillometry testing on Day 1 afternoon, Day 1 evening, Day 2 morning, Day 2 evening
|
Pupil size as measured by pupillometry
|
During pupillometry testing on Day 1 afternoon, Day 1 evening, Day 2 morning, Day 2 evening
|
Melatonin levels for circadian timing assessment
Time Frame: Night 1
|
Melatonin levels from saliva collection during Night 1 light box red light exposure
|
Night 1
|
Melatonin levels for hormone response
Time Frame: Night 1 and Night 2
|
Melatonin levels from saliva collection during Night 2 light box blue/green light exposure compared to those during Night 1 light box red light exposure
|
Night 1 and Night 2
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Elizabeth B Klerman, MD PhD, Mass. General Hospital
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Estimated)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 2023P000904
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
IPD Plan Description
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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