Association between inspiratory muscle strength and functionality variables in older people with COPD: a cross-sectional study
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Abstract
Introduction: Inspiratory muscle strength is related to functional variables in chronic obstructive pulmonary disease (COPD). However, literature is scarce, specifically considering older people with COPD. Objective: To investigate whether inspiratory muscle strength is related to functional variables in older people with COPD. Methods: Cross-sectional study in which older people with a clinical diagnosis of COPD (GOLD criteria) and candidates for rehabilitation were eligible. The following variables were measured: maximum inspiratory pressure (MIP) (manovacuometry), functional capacity (six-minute walk test), functional mobility (Timed Up and Go Test), fear of falling (Falls Efficacy Scale-International questionnaire), handgrip strength (HGS) (dynamometry), peripheral muscular endurance (30-second sit-to-stand test), Health-related quality of life (HRQL), St. George’s Respiratory Questionnaire (SGRQ), and the impact of COPD on health status (COPD Assessment Test). Results: 32 older people (68.63±5.35 years, 17 male) with moderate to very severe COPD participated in the study. MIP correlated negatively and strongly with functional mobility (r=-0.706; p<0.0001). There was a positive and moderate correlation between MIP with functional capacity (r=0.431; p=0.014), HGS (r=0.565; p<0.001), and peripheral muscular resistance (r=0.546; p=0.001). The MIP showed a moderate negative correlation with fear of falling (r=-0.539; p=0.001). There was no association between MIP with HRQL (r=-0.089; p=0.628) and with the impact of COPD on health status (r=-0.297; p=0.098). Conclusion: Inspiratory muscle strength was associated with functionality variables, such as mobility, functional capacity, fear of falls, peripheral muscle strength, and resistance in older people with COPD.
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