Correlation of maximum voluntary ventilation to the strength and resistance of young respiratory muscles

Abstract

INTRODUCTION: Maximum voluntary ventilation is one of the widespread tests for assessing respiratory muscle strength, even without being validated for this purpose. Controversies are still found in the literature regarding the interpretation and applicability of the use of MVV in clinical practice. OBJECTIVE: To verify the correlation between maximum voluntary ventilation and respiratory muscle strength and endurance in healthy youngsters. MATERIALS AND METHODS: Observational cross-sectional study conducted at the Clinic. Individuals> 18 years of age, of both sexes and healthy were included. Participants had their respiratory muscle strength assessment using a manovacuometer, in which Pimax and Pmax were obtained. The resistance was evaluated through the constant load test by Power Breathe, using 60% of the Pimáx. Maximum voluntary ventilation was performed by a spirometer. Pearson's correlation test was applied to correlate the variables Pimax, Pmax and VVM. The study was approved by the ethics committee, CAAE 10849519.9.0000.5544. RESULTS: 27 participants were evaluated, of which 59.3% were male and 55.6% were active. The maximum voluntary ventilation with Pimax and Pmax, presented respectively p = 0.04 and 0.02 and r = 0.53 and 0.57. CONCLUSION: The maximum voluntary ventilation test has a moderate correlation with respiratory muscle strength and has no correlation with the constant load test.