Diaphragm Structure and Function in Children

During the first study visit, participants will undergo a series of pulmonary function and muscle performance tests followed by treadmill walking trials at different speeds with concurrent expired gas analysis via a face mask. The participants will then perform a training program for the breathing muscles at home for 6 weeks. The research team will follow up each week via telehealth visits to support training. After the 6-week training program, participants will return in-person for a follow-up visit and will undergo the same series of assessments as the first visit.