Inclusion Criteria:  Patients with a body mass index (BMI) ˃35, age interval of 18-65, ASA score II-III undergoing laparoscopic bariatric surgery  Exclusion Criteria:  Patients with neuromuscular, cardiopulmonary, and cerebrovascular diseases, phrenic nerve damage or diaphragm paralysis, those who have undergone thoracic surgery, who could not communicate, who did not want to participate in the study, who used alcohol, those who needed postoperative intensive care, those who had surgical complications during surgery, those who were switched to open surgery