Inclusion Criteria:  18 years and over, Hemodiamic stability (OCD >60, OCD <120, respiratory rate <35, SpO2 >90), Areas of >3/5 (Oxford scale) and above on the lower limbs with areas of secure support, The patient scores 0 (awake and calm) on the Richmond Agitation Sedation Scale (RASS), PaO2 / FiO2 ≥300, Body temperature below 38 degrees, Platelet count ≥20,000 cells / mm3, Having blood sugar of 60-360 mg/dl, Having arterial monitoring, Patient with 30% FiO2 due to mechanical ventilator, Those with mechanical ventilator-dependent ventilation method (mode) PASB, Patient with a PEEP value of 5 due to mechanical ventilator, Patient with a PASB value of 10 connected to a mechanical ventilator, A sample accepted by the patient who voluntarily agreed to participate in the study was approximated from the patient.  Exclusion Criteria:  Patients under the age of 18, Those with hemodynamic instability (OCD <60 mmHg, OCD >120 mmHg, breath rate >35, SpO2 <90), Those who do not have secure unsupported sitting balance and have a score of >3/5 (Oxford scale) in the lower limbs, Patients whose Richmond agitation sedation scale (RASS) is between +1 and +4 points, and patients with a score between -1 and -5, Those with arrhythmia, Patients without arterial monitoring, Patients whose FiO2 percentage is not 30% in patients on mechanical ventilator, Patients who do not have ventilation method (mod) PASB in patients on mechanical ventilator, Patients who do not have a PEEP value of 5 in patients on mechanical ventilators, Patients who do not have a PASB value of 10 in patients on mechanical ventilators, Those with neurological and orthopedic contraindications, Patients who could not get approval from the relatives of the patients who did not accept to participate in the study were excluded from the study.