Dose-Response Effects of Inspiratory Muscle Strength Training on Blood Pressure and Vascular Function

This study is investigating whether a breathing exercise called Inspiratory Muscle Strength Training (IMST) — where you breathe in forcefully against resistance — can lower blood pressure and improve blood vessel health. Researchers want to find the right dose of this exercise. **You may be eligible if...** - You are 18 years or older - Your resting systolic blood pressure (the top number) is 120 mmHg or higher - You do not have serious heart or metabolic disease - You speak English and can follow study instructions - You are a non-smoker (no cigarettes or vaping in the past year) - You can follow pre-visit rules (no caffeine or food for 3 hours, no alcohol or vigorous exercise for 24 hours before visits) **You may NOT be eligible if...** - You have a history of cardiovascular disease - You recently had abdominal surgery or have an abdominal hernia - You have severe or hard-to-detect asthma - You have a ruptured eardrum or ear condition - You are pregnant or planning to become pregnant Talk to your doctor to see if this trial is right for you.