Incentive Spirometry Versus Inspiratory Muscle Training After Coronary Artery Bypass Grafting

Inclusion Criteria: * 45 male patients will be included in this study. * Patients with age from 50 to 60 years old (undergoing coronary artery bypass graft surgery) through median sternotomy. * Their body mass index from 25 to 29.9 kg/m2 * Patients will be alert and able to follow instruction. Exclusion Criteria: * Who are expected not to be able to conduct or comply with IS and IMT. * Patients with cognitive or neurological deficits. * Patients with coexisting acute or chronic respiratory disorders. * Patients unable to understand or show the proper use of the incentive spirometer and Inspiratory muscle training . * Patients who cannot be instructed or supervised to assure appropriate use of the device patients in whom cooperation is absent or patients unable to understand or demonstrate proper use of the devices (inspiratory muscle training and incentive spirometry). * Patients who are confused or delirious. * Patients undergoing any other surgery along with CABG. * Patients undergoing emergency CABG surgery. * Chronic obstructive pulmonary disease (COPD), asthma, restrictive lung disease, preoperative major chest infection e.g. pulmonary tuberculosis, chest deformities such as pectus carinatum, pectus excavatum, thoracolumbar scoliosis, diaphragmatic hernias diagnosed on history.