Objective: To assess the impact of IMT on the functional capacity of patients undergoing CABG with a high risk of PPC. Design: This is a randomized clinical trial. Setting: Instituto Nobre de Cardiologia (INCARDIO), Feira de Santana – Bahia. Subjects: In total, 29 patients were selected at high risk of pulmonary complications. Intervention: Patients were divided into two groups at risk of CPP: intervention group (IM) submitted to IMT and control group (CG) who received standard care. Considered a high risk patient, age over 60 years, diabetic, smoker and body mass index above 27 kg / m2. All were submitted to preoperative evaluation and hospital discharge for maximum inspiratory pressure (MIP), maximum expiratory pressure (MEP) and six-minute walk test (6MWT). Results: 29 individuals were evaluated, 19 of whom were female (65%) and the mean age was 67±4 years. The IG showed MIP before of 103±15 and the CG 105±17cmH2O (p=0.35), at discharge the IG had 80±14 and the CG 75±15cmH2O (p=0.12). The 6MWT in the pre was 386±43 in the IG and 398±56 meters (p = 0.65). In the CG, at discharge they covered 285±51 meters in the IG and 288±45 in the CG (p=0.34). There were no differences between the variables of the groups. Conclusion: It is concluded that the IMT performed in the postoperative period did not show significance on the variables muscle strength and functional capacity in patients who were at high risk of pulmonary complications.