Analysis of the Reliability and Agreement of the Incremental Respiratory Resistance Test (TIRE) measurements in individuals with heart disease.
Maximum inspiratory pressure, Cardiovascular disease, Respiratory muscles.
Introduction: The incremental respiratory resistance test (TIRE) is capable of evaluating the inspiratory work in a more comprehensive way than Manovacuometry through maximum inspiratory pressure, measuring the duration and power of the inspiratory incursion. Evidence on the reliability of the method in individuals with cardiovascular diseases appears to be unavailable.
Objective: To evaluate the agreement of an instrument for assessing MIP in PrO2 with the gold standard, the Manovacuometro, in individuals with CVD, to evaluate the intra-rater reliability and the properties of agreement of TIRE measurements.
Methods: 12 individuals with cardiovascular diseases from the Cardiopulmonary Rehabilitation Project (PRECAP) were selected and underwent PImax assessment using the Manovacuometro MV300 and the TIRE method on the PrO2 device. For reliability of the method, a TIRE re-test was applied to the entire sample.
Results: 12 participants were included (50% men) with a mean age of 60 years, presenting a reduced mean left ventricular ejection fraction (49%) of ischemic etiology (75%), reduced lung function (< 80%) and pressures normal maximal inspiration (> 80% of predicted). There was high agreement between the equipment (Manovacuometer vs PrO2), r=0.839. The intraclass correlation coefficient was 0.984 for PImax and 0.943 for SMIP (95%CI= 0.772 - 0.986) for intra-rater reliability of the TIRE method applied to a subgroup of 10 participants.