21 (16 males/5 femalesen) with a mean age of 73 ± 7.4 years were studied. Among the 21 study participants, the most prevalent clinical condition was coronary artery disease (11 cases); four individuals showing a diagnosis of chronic obstructive pulmonary disease and/or asthma, two presented congestive heart failure and the last four had other diseases

Each session The session itself consisted of the following: two sets of 15 breathe cycles without removing the breathing promoter from the mouth and with the aid of a nose clip and 1-minute interval between sets. For training, we used the breathing promoters Power Breathe® Plus Light and Medium Resistance, possessing 10 levels of load gradation ranging from 17 to 186 cm H2O, which were adjusted for each patient and allowed for the individualized prescription of IMT

During an IMT session, with two sets of 15 cycles at 30% of the load observed in MIP, there were no significant clinical or hemodynamic changes in patients regularly attending a supervised exercise program. In contrast, there are relatively frequent inductions of cardiac arrhythmias, mostly of low complexity, and more rarely, fleeting changes in ventricular repolarization during an IMT session.