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New method for evaluating maximal respiratory pressures: Concurrent validity, test-retest, and inter-rater
Bruna M F Silveira1, Manoel C B Pereira2, Daniella R Cardoso3
1Rehabilitation Sciences Program, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
Brazilian Journal of Physical Therapy
|June 13, 2021
Summary
Maximal respiratory pressures (MRP) measured with the TrueForce device show good validity and reliability in healthy individuals and those with COPD. However, MRP values are lower when measured at functional residual capacity (FRC) compared to other lung volumes.
Area of Science:
- Respiratory Physiology
- Pulmonary Function Testing
- Medical Instrumentation
Background:
- Maximal respiratory pressures (MRP) are crucial indicators of respiratory muscle strength.
- Measuring MRP at functional residual capacity (FRC) may offer a more accurate reflection of real respiratory muscle function.
- Assessing the reliability and validity of new instruments for MRP measurement is essential for clinical application.
Purpose of the Study:
- To evaluate the concurrent validity and reliability (test-retest and inter-rater) of the TrueForce instrument for measuring MRP.
- To compare MRP values obtained at different lung volumes (FRC, residual volume [RV], and total lung capacity [TLC]).
- To assess these parameters in both healthy individuals and those with chronic obstructive pulmonary disease (COPD).
Main Methods:
- Concurrent validity was assessed by comparing TrueForce measurements with MicroRPM® at RV and TLC in 100 healthy individuals.
- Test-retest and inter-rater reliability were evaluated using the TrueForce at FRC.
- MRP were compared between FRC and RV (inspiratory) and FRC and TLC (expiratory) in 100 healthy individuals and 15 individuals with COPD.
Main Results:
- The TrueForce demonstrated good concurrent validity (ICC 0.77-0.86) and reliability (ICC 0.78-0.91) for both inspiratory and expiratory pressures.
- MRP measured at RV and TLC were significantly higher than those measured at FRC in both healthy individuals and COPD patients.
- Specific mean differences and confidence intervals were reported for these comparisons.
Conclusions:
- The TrueForce instrument exhibits good concurrent validity and reliability for measuring maximal respiratory pressures.
- MRP values are influenced by the lung volume at which they are measured, being lower at FRC.
- These findings support the use of the TrueForce for respiratory muscle strength assessment, with careful consideration of measurement volume.
Keywords:
Chronic obstructive pulmonary diseaseFunctional residual capacityMeasurement propertiesPhysical therapyRespiratory musclesMore Related Videos
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