Effects of Inspiratory Muscle Training on Parkinson's Disease

The home-based inspiratory muscle training (IMT) protocol will use an inspiratory threshold loading device (PowerBreathe Wellness, Southam, United Kingdom). IMT for experimental group will start with a minimal load (\~9 cmH2O) during the first week, aiming for a familiarization process. During the second week, the IMT targeted a moderate load of 45% of maximal inspiratory pressure (MIP) previously defined, which will be gradually increased by 10% of MIP each week until reaching 75% of MIP in the final week.

The Sham group will performer the same training protocol that experimental group, but at 5% of MIP during all weeks. Therefore, the sham group will not increase the training load during the protocol.