Inspiratory Muscle Strength Training in Adults With Type 1 Diabetes

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Adults with type 1 diabetes have elevated cardiovascular disease risk, and systolic blood pressure is a leading modifiable contributor to that risk. Aerobic exercise lowers blood pressure but poses time and glycemic-management barriers for people with type 1 diabetes. Inspiratory muscle strength training is a brief, home-based, device-based intervention that takes about five minutes per day and has lowered systolic blood pressure in other adult populations. This pilot trial will test whether eight weeks of daily high-resistance inspiratory muscle strength training lowers blood pressure and improves vascular function in adults with type 1 diabetes. Participants will be randomized 2:1 to high-resistance or very-low-resistance sham training using a POWERbreathe K3 device and will complete 30 training breaths per day at home for eight weeks. Outcomes are assessed before and after the training period.