Pulmonary diseases are a common cause of mortality and morbidity worldwide. Chronic Obstructive Pulmonary Disease (COPD) causes respiratory muscle weakness, but also causes hypercapnia, dyspnoea, oxygen desaturation, and gait disturbances. In COPD, the main symptom is dyspnea and leads to activity limitation. It has been shown that with exercise, the diaphragm workload increases in COPD patients and requires more MIP than healthy humans. This is associated with dyspnea during exercise and tiredness in the respiratory muscles. Dyspnea is defined as the difficulty in breathing of a person. Painful situations are defined as 'kinesiophobia' as a result of physical injuries and fear of repetition of the problem as a result of injury. Similarly, COPD patients avoid themselves from dyspnea-related activities or compensate by reducing the rate of activity. This reduces the severity of the symptom that precedes the symptom that may occur. As a result, fear of movement occurs due to dyspnea. Decrease in the level of activity; social isolation, fear of dyspnea, depression and anxiety result in a stubborn cycle, reducing the quality of life. In order to increase respiratory muscle strength and endurance, to improve the length tension relationship of respiratory muscles and to increase respiratory capacity, respiratory muscle training is performed by using the training principle of skeletal muscles. In COPD, inspiratory muscle training has been shown in many studies to reduce dyspnoea perception, increase exercise capacity and quality of life.
