Inspiratory Muscle Training in Hospitalized Heart Failure Patients

"The IMT protocol will involve the use of the Power Breath® linear resistor device, classic light model (Anvisa Registration: 81001390001). The IMT group will perform the protocol with a load ranging from 30% to 50% of maximal inspiratory pressure (MIP). Two daily sessions of 30 repetitions each will be conducted, starting with a minimum load of 30%, with a 10-minute interval between sessions, and a proposed weekly load increase based on patient tolerance.~For training load progression, patient effort will be taken into account, aiming to maintain a perceived exertion level between light and moderate fatigue (BORG scale less than 4).~Patients will remain seated at a 90° angle, using a nasal clip, and will be encouraged to perform consecutive inspirations with their mouth on the device's mouthpiece. Vital signs-including blood pressure (BP), mean arterial pressure (MAP), peripheral oxygen saturation (SpO2), respiratory rate (RR), heart rate (HR)-and dyspnea sensat"

The control group (IMTsham) will perform two daily sessions of 30 repetitions each without any load, using the same resistor device.