Breathing Helium-Oxygen may unlock exercise secrets for heart failure patients

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.