This study aimed to compare the effects of Inspiratory Muscle Training (IMT) and Diaphragmatic Neuromuscular Electrical Stimulation (NMES) on inspiratory muscle strength, mechanical ventilator parameters, and functional levels in intubated intensive care unit (ICU) patients. Thirty-two intubated patients were divided into two groups: the IMT group and the NMES group. In the IMT group, IMT was administered twice a day in addition to routine physiotherapy. In the NMES group, electrical stimulation was applied to the diaphragm muscle for 40 minutes in addition to routine physiotherapy. The primary outcomes of the study are inspiratory muscle strength and physical function level. The secondary outcomes are mechanical ventilator parameters, extubation time, and length of hospital stay.