Outcome measures.
1. Outcome measures at baseline; 2. Outcome measures after 15 days of intervention. 3. Post-intervention. IT, instrumental training. RE, respiratory training. Abbreviations: FVC, forced vital capacity; FEV1, forced expiratory volume during the first second; FVIC, forced inspiratory vital capacity.Due to the heterogeneity of the sample in the age variable, Pearson correlation was applied to all outcomes, showing all values below 0.4, which is considered as weak or non-existent correlation (