Existe associação entre fadiga muscular periférica, atividades de vida diária e força muscular respiratória em indivíduos com doença pulmonar obstrutiva crônica?

Abstract

Introduction: Chronic obstructive pulmonary disease (COPD) is characterized by airflow limitation, associated with an inflammatory response and systemic manifestations, such as dyspnea, stress intolerance and physical inactivity. The sum of these changes can result in muscle fatigue and impact on the performance of activities of daily living (ADL). Objectives: To evaluate the association between peripheral muscle fatigue, ADL performance and respiratory muscle strength in individuals with COPD, and to compare healthy individuals matched by age. Methods: Individuals diagnosed with COPD and healthy volunteers were recruited, who performed peripheral muscle fatigue assessments, by surface electromyography, ADL performance, by Glittre's ADL test and respiratory muscle strength. Results: 19 individuals were evaluated, 9 diagnosed with COPD and 10 healthy, who had a quadriceps isometric contraction time of 71.1 ± 26.4 and 67.4 ± 31.2 seconds, respectively, performed the ADL test in 6.9 ± 2.9 and 3.79 ± 0.7 minutes, with a significant difference between groups (p <0.05), and had preserved respiratory muscle strength. However, there was no significant correlation between the evaluations performed. Conclusion: Based on the results of this study, it is possible to conclude that there is no association between quadriceps muscle fatigue, ADL performance and respiratory muscle strength in individuals with COPD. In the comparison between the groups, the COPD group showed lower functional capacity and lower values of respiratory muscle strength, but there was no significant difference in quadriceps muscle fatigue