Breathing Helium-Oxygen may unlock exercise secrets for heart failure patients
NCT ID NCT05723679
First seen May 12, 2026 · Last updated Jun 22, 2026 · Updated 10 times
Summary
This study looks at whether breathing a low-density helium-oxygen gas mixture can reduce breathlessness and improve exercise capacity in people with heart failure with preserved ejection fraction (HFpEF) and obesity. Researchers will measure how much oxygen the body uses during breathing and compare exercise performance while breathing the gas mixture versus normal room air. The goal is to understand if lung-related limitations are a key cause of exercise intolerance in this group.
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Study contacts
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Contact
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Contact
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Locations
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UT Southwestern Medical Center
RECRUITINGDallas, Texas, 75390, United States
Contact Phone: •••-•••-•••• Email: •••••@•••••
Contact Phone: •••-•••-•••• Email: •••••@•••••
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
Helium-oxygen gas mixture (HeO2)
What this could lead to
If successful, this could point toward breathing-based therapies to improve exercise tolerance and quality of life in heart failure patients with obesity.
What could go wrong
This is a small, early-stage study (78 participants) focused on understanding mechanisms, not testing a treatment. The helium-oxygen mixture is only used temporarily during tests, so it may not lead to a practical long-term therapy.
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.