Warm water soaks may boost blood pressure control in older women
NCT ID NCT03857490
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study tested whether adding lower leg heat therapy (soaking legs in warm water) to a standard blood pressure pill helps older women with high blood pressure more than the pill alone. 134 women aged 60-85 participated, either soaking in 42°C water or neutral 33°C water for 8 weeks. The goal was to see if heat therapy improves blood pressure control and blood vessel health.
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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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134 people
The number who actually took part.
- Started
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Jul 2019
- Finished
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Dec 2025
- 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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60 to 85 years
- Sex
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Female participants only
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
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Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Women between the ages of 60-85 years with essential hypertension (systolic BP 140-179 and/or diastolic BP 90-109 mmHg) * Must be able to understand and speak English Exclusion Criteria: * Illness or disabilities that preclude home-based heat therapy * Any evidence of cardiopulmonary disease * Severe hypertension (BP ≥180/110 mmHg; for safety reasons) * Secondary hypertension * Being on ≥3 antihypertensive agents * Chronic kidney disease * Diabetes mellitus or other systemic illness * Any history of substance abuse (other than tobacco) * Current cigarette smokers * History of gouty arthritis * Taking hormonal replacement therapy * Being obese (body mass index ≥30 kg/m2) * Endurance trained athletes * Impaired cognitive function or diagnosed dementia
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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.
Contacts and locations
Locations
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Institute for Exercise and Environmental Medicine
Dallas, Texas, 75231, United States
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