Relationship between inspiratory muscle strength and balance in women: A cross-sectional study

Background There is scarce evidence on changes at the functional level associated with the respiratory area in women. This study aims to analyse the relationship between inspiratory muscle strength and balance in women. Material and methods In this cross-sectional observational study, the sample consisted of groups according to the results obtained in the balance test. Inspiratory muscle weakness was defined as maximum inspiratory pressure (MIP) <= 80% of the predictive value. MIP was carried out using through a mouthpiece, with an electronic manometer. Logistic regression model was used to examine if MIP predicts balance. Results 159 women participated in the study. Approximately 20% of them achieved balance <= 2 seconds and 18% presented MIP <= 80%. MIP was associated with the time achieved in the one-leg support test. Subjects with MIP <= 80% of the predictive value show 3 times more risk of having a lower performance in the balance test (OR = 3.26). Conclusions Inspiratory muscle weakness is associated with deficient balance in this sample. It shows the need for multidimensional assessment and rehabilitation strategies for patients identified as having MIP weakness and/or balance disorders.