RESPIRATORY MUSCLE STRENGTH AND DYSPNEA IN PARKINSON'S DISEASE: A CROSS-SECTIONAL ANALYSIS

Abstract

Objective: To evaluate respiratory muscle strength in patients with Parkinson's disease (PD) and to investigate the association of these parameters with dyspnea intensity. Methods: A cross-sectional study was conducted with 26 patients (12 women and 14 men) with PD, aged between 49 and 81 years, participants of the Parkinson's Association of Pernambuco. The sample was defined by convenience. Data were collected through clinical questionnaires, assessment of respiratory muscle strength (MIP and MEP), and application of the modified dyspnea scale (MRC). Respiratory muscle strength was measured using a manometer. Statistical analyses included one-way ANOVA and post-hoc LSD t-test for comparisons between groups stratified by dyspnea intensity. Results: The mean age was 64.3 ± 7.5 years. The participants were divided into three groups according to the answers to the questionnaire regarding the intensity of dyspnea: dyspnea only with intense exercise (n=8), dyspnea with moderate exercise (n=9), and dyspnea with daily activities (n=9). There was a significant difference between the groups about age and stage of the disease (p<0.05). Respiratory muscle strength (MIP) was significantly reduced in the groups with the highest intensity of dyspnea. Conclusion: The intensity of dyspnea in patients with PD is associated with decreased inspiratory muscle strength. Individuals with greater dyspnea have lower inspiratory force values, which can impact the sensation of dyspnea in their daily activities and quality of life. These findings suggest the need for therapeutic strategies aimed at improving respiratory muscle strength and preserving pulmonary function in patients with PD.