Psychometric properties of volitional tests used to measure respiratory muscle strength and endurance: A systematic review.

Introduction: It is essential that diagnostic tests for evaluating respiratory muscles have proven reliability and validity. This study aims to synthesize studies that evaluated the psychometric properties of volitional tests used to measure respiratory muscle strength and endurance.

Methods: A systematic literature search was conducted in MEDLINE/PubMed, LILACS, Cochrane Central Register of Controlled Trials, Scopus and SciELO.