Hormone-Brain link explored in new study
NCT ID NCT07212712
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looks at how the hormones estrogen and testosterone control blood flow to the brain. Researchers will temporarily block these hormones in 50 healthy young men and women, then measure brain blood flow and energy use. The goal is to understand sex differences in brain health and improve treatments for conditions like stroke and dementia.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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About 50 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Apr 2026
An estimate. Start dates often move.
- Expected to finish
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Dec 2027
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 to 40 weeks
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: The investigators will recruit healthy young (18-40 years) males (n = 25) and females (n = 25). Females must be naturally cycling (i.e., no oral or hormonal contraceptives), not pregnant, and premenopausal. Participants must be normotensive (\<140/90 mmHg \& \>90/60 mmHg) and have no medical history of cerebrovascular, cardiopulmonary, cardiovascular, neuromuscular, and renal disease assessed by a study questionnaire. A recent physical examination (within 1 year of participation) from a family physician or a completed physical examination by the study doctor is required prior to participation. All subjects will sign an informed consent form prior to participation. Participants will be excluded if they meet any of the following criteria: * Hypertensive (≥140/90 mmHg) or hypotensive (≤90/60 mmHg) * BMI ≥ 30 kg/m2 * Fasting blood glucose ≥ 100 mg/dL * Abnormal results on standard blood hematology tests (e.g., complete blood count, comprehensive metabolic panel) * Males with hypogonadism (total testosterone ≤ 262 ng/dL, per Endocrine Society recommendations) * Any history of cerebrovascular, cardiopulmonary, cardiovascular, neuromuscular, or renal disease * Any liver dysfunction or disease * Taking any cardiovascular medications or medications that would interfere with study medications (e.g., strong organic anion transporting polypeptide 1B1 inhibitors) * Contraindications or sensitivities to study medications * Current eating disorder (defined as \>2 on the 'SCOFF' questionnaire 67) * Current smokers * Females with an irregular menstrual cycle or any medical conditions affecting the menstrual cycle (normal cycle defined as 21-35 days from menstrual cycle diary) * Females who are pregnant (assessed with pregnancy test at screening and prior to starting medications), breastfeeding, or planning to conceive within 3 months * Females using hormonal birth control (Copper intrauterine devices \[IUDs\] will be allowed as they do not change systemic hormone levels) * Females who are peri- or postmenopausal (as determined by STRAW criteria 68) * History of hormone-sensitive cancers (i.e., breast, ovarian, uterine or prostate) * Z-score \< -2 as assessed with DXA scan (to determine risk of decrease in bone mineral density) * Assessed using the Center for Epidemiologic Studies Depression (CES-D) scale, participants with a score \> 16 at screening unless otherwise approved by the study MD
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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University of British Columbia - Okanagan
Kelowna, British Columbia, V1V 1V7, Canada
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