Impact of Respiratory Muscle Training and Nitrate Therapy on Exercise Tolerance in Simulated Altitude

What this Trial Is About

Researchers are evaluating whether respiratory muscle training (RMT) and dietary nitrate supplementation can improve exercise tolerance under moderate altitude conditions where oxygen is limited. The study focuses on healthy, recreationally active adults aged 18 to 40 without heart, lung, or metabolic diseases. By combining breathing muscle strengthening and nitrate therapy, which enhances blood vessel function, the study aims to find non-drug methods to enhance oxygen delivery and reduce physical strain during exercise in low-oxygen environments. Participants will be randomly assigned to one of four groups: RMT with nitrate supplement, RMT with placebo, sham RMT with nitrate supplement, or sham RMT with placebo. The RMT involves using a handheld breathing device with resistance five days a week for 4 to 6 weeks, while the nitrate group consumes daily concentrated beetroot juice. Sham groups use a low-resistance device or placebo drink that looks and tastes like the nitrate supplement but lacks active ingredients. Participants will undergo exercise tests on a stationary bike before and after the intervention, both at normal oxygen and simulated altitude. Researchers will measure exercise duration, oxygen use, heart rate, breathing, blood pressure, muscle oxygen levels, and respiratory muscle strength. The main outcome is change in exercise tolerance after 4 to 6 weeks. The study includes monitoring of physiological responses to understand how the treatments affect breathing and cardiovascular function during exercise.

Effects of Breathing Training and Nitrate on Exercise at Simulated Altitude