Inclusion Criteria:  ≥ 18 years of age American Society of Anaesthesiologists Classification I or II  Exclusion Criteria:  Chronic lung disease Preexisting diaphragmatic weakness Neurologic disease with known motor weakness Paralysis of the phrenic nerve Contraindication for any movement in the cervical vertebrae Conditions that limit the movement of the diaphragm e.g. ascites, increased intraabdominal pressure, adipositas. Inability to communicate in the official language Infections, lesions or stricture in the neck area Implanted cardiac devices e.g. pace maker, defibrillator, event recorder Implanted medical pumps e.g. left ventricular assist device Metal implants in the upper body Preganancy