Patients
The criteria were analyzed in the preoperative period, when patients were admitted to the hospital. Patients of both sexes aged between 30 and 70 years, who underwent myocardial revascularization with extracorporeal circulation and median sternotomy were included. As exclusion of heart valve disease, previous lung disease, death, who did not understand how to perform the inspiratory muscle strength assessment, presented hemodynamic instability (mean arterial pressure below 70 mmHg or above 110 mmHg and / or heart rate below 60 or above 120 beats per minute) during assessment or inspiratory muscle training, lack of understanding to answer the heart anxiety questionnaire and emergency surgery.