Chronic obstructive pulmonary disease (COPD) is currently the most common respiratory disease in the world. In the structure of chronic lung diseases, the most common are chronic obstructive pulmonary diseases (COPD), which occur in more than 14% of men and 8% of older women. The decrease in physical endurance of COPD patients is primarily due to increased work and increased fatigue of the respiratory muscles due to restriction of air flow. In order to make sure that there is fatigue, it is necessary to have data that the clinical symptoms are due to the loss of contractile strength and endurance of the respiratory muscles as a result of significantly increased work of breathing in adverse conditions of activity. Due to the prevalence of respiratory muscle fatigue syndrome early diagnosis and treatment of respiratory muscle dysfunction is an urgent problem of its clinical diagnosis.
