Active — Not RecruitingPhase 4

The Effects of Acute Melatonin Supplementation on Cardiovascular Responses to Sympathetic Activation

United States100 participantsStarted 2023-01-01

Plain-language summary

the purpose of this experiment is to determine if acute melatonin supplementation alters central and peripheral cardiovascular responses to a cold pressor test at rest and during dynamic exercise.

Who can participate

Age range

18 Years – 35 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Inclusion Criteria: * Healthy men and women * Women must be premenopausal with a regular menstrual cycle (26-30 days) Exclusion Criteria: * History of autonomic dysfunction * Cardiovascular diseases * Diabetes * Tobacco/nicotine use * Systolic Pressure \>= 130 mmHg * Diastolic Pressure \>= 85 mmHg * Regular melatonin use \>= 1 use/week * Allergy to melatonin * Cardiometabolic medication use (e.g. anti-hypertensives, insulin-sensitizing, statins) * Sex hormone replacement medical use (e.g. testosterone, estrogen, progesterone) * Pregnancy

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

Muscle Tissue Oxygenation

Timeframe: 7 minutes of rest and 7 minutes of exercise

Mean Arterial Pressure

Timeframe: 7 minutes of rest and 7 minutes of exercise

Trial details

NCT IDNCT04831398

SponsorUniversity of Oklahoma

Sponsor typeOTHER

Study typeINTERVENTIONAL

Primary completion2026-11

View on ClinicalTrials.gov More Healthy trials

Who can participate

Age range

18 Years – 35 Years

Sex

ALL

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.