The purpose of this study is to evaluate the feasibility and effects of a 12-week high-intensity progressive Inspiratory Muscle Training (IMT) program in individuals with Class III obesity (BMI ≥ 40 kg/m²) and obstructive sleep apnea (OSA). Using a single-case experimental design (SCED) with multiple baselines, the study will investigate whether this respiratory intervention can reduce the severity of sleep apnea, as measured by the Apnea-Hypopnea Index (AHI), and improve inspiratory muscle strength and sleep quality. Participants will perform daily training sessions using a resistive loading device (POWERbreathe), with intensity progressing from 40% to 90% of their maximum inspiratory pressure.
Of both genders.
Class III obesity (BMI > 40 kg/m²).
Diagnosis of OSA.
Without neurological conditions that would prevent them from responding to the study assessments.
Systemic diseases (pulmonary, cardiac or renal).
Are using medications that may affect muscle performance.
Are currently using CPAP therapy.
Conditions that could compromise adherence to the study protocol.