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The digital manovacuometer developed at the Federal University of Minas Gerais (UFMG) is a reliable and valid instrument for assessing maximal inspiratory, maximal expiratory, and nasal inspiratory pressures in healthy subjects. Novelty: ClaimNovelty.METHODOLOGICAL. Consensus alignment: ConsensusAlignment.NEUTRAL.

March 24, 2026

Test-retest reliability and concurrent validity of a digital manovacuometer

Key Points

This study aims to assess the test-retest reliability and concurrent validity of the digital manovacuometer developed at UFMG.
30 healthy subjects aged 20-30 were assessed using the digital manovacuometer UFMG and MicroRPM.
Variables measured included maximal inspiratory pressures (MIP), maximal expiratory pressures (MEP), and nasal inspiratory pressure (SNIP).
Statistical analyses included Intraclass Correlation Coefficient (ICC) for reliability, Pearson correlation, and Bland-Altman methods for validity.
ICC values indicated high reliability (0.89 for MIP, 0.84 for MEP, and 0.78 for SNIP; p<0.05).
No significant differences were found in measurements within two days (p>0.05).
High correlation was noted between instruments (0.82 to 0.85) with no significant differences in values (p>0.05).

Abstract

Background: The manovacuometer is a simple and non-invasive test to measure respiratory muscle strength. Guidelines recommend the use of a digital manovacuometer due to its high accuracy. Aims: The purpose of this study was to assess the test-retest reliability and concurrent validity of the digital manovacuometer developed at Federal University of Minas Gerais (UFMG, Belo Horizonte, Brazil). Methods: 30 healthy subjects were assessed (20-30 years old, normal body mass index and pulmonary function) using the manovacuometer UFMG and MicroRPM ® (Micro Medical, UK). The following variables were analysed: maximal inspiratory pressures (MIP), maximal expiratory pressures (MEP) and nasal inspiratory pressure (SNIP), respectively. Statistical analysis was performed by Intraclass Correlation Coefficient (ICC) and paired Student t test (reliability); Pearson correlation, paired Student t test and the Bland-Altman method (validity). A p0.05). For validity, the correlation between the two instruments was of high magnitude for all variables (0.82 to 0.85) and no significant difference were found between the values obtained for both instruments (p> 0.05); Bland-Altman analysis showed no systematic overestimation or underestimation of MIP, MEP and SNIP. Conclusions: Our results demonstrated that the manovacuometer UFMG is a reliable and valid instrument to assess of MIP, MEP and SNIP in healthy subjects.

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