The breathing exercise device is a device that simulates pursed-lip breathing by creating positive expiratory pressure (PEP). Before starting to use the device, it will be explained that they need to put the mouthpiece on the device and put the nose clip on their nose, and the participants will be shown how it is done. The device will be used at 5 cmH2O pressure. A single exercise session consists of 3 exercise cycles, and a single exercise cycle consists of 15 breathing-exhalation activities. Participants will complete 3 cycles (a total of 45 inhales and exhales) in a single session. 1 loop lying on the left side, 1 loop lying on the right side, and 1 loop in sitting upright position. Participants held these sessions in the morning, afternoon, and evening. After completing each cycle, the participants will remove their nose clips and cough 2-3 times. Each participant will perform a total of 135 breathing exercises in one day.

Change in FEV1/FVC ratio will be evaluated with pulmonary function test

The COPD and Asthma Fatigue Scale was developed by Revicki et al in 2010 to reveal the effect of COPD and Asthma on fatigue. The items of the questions in the scale, which consists of 12 questions in total, are graded with a 5-point Likert type as "never", "rarely", "sometimes", "often", "very often". A total of 12 to 60 points is obtained from the scale. A single score is obtained from the scale for the state of fatigue, and there is no evaluation of the sub-dimensions. An increase in this score indicates that the person's fatigue level is high.