Test-retest reliability for two indices of ventilatory efficiency measured during cardiopulmonary exercise testing in healthy men and women

Clinical Physiology and Functional Imaging
James A DavisKara B Costello

Abstract

The level of ventilation (VE)) at a given carbon dioxide output (CO2) determines ventilatory efficiency. During cardiopulmonary exercise testing (CPET), ventilatory efficiency can be measured as the slope of the (VE) versus VCO2 relationship or the lowest VE/VCO2. We evaluated the test-retest reliability of these two ventilatory efficiency indices in 29 healthy subjects (14 males). Each subject performed duplicate cycle ergometer tests on different days. Ventilation and the gas fractions for oxygen and CO2 were measured with a Vacumed metabolic cart. Linear regression analysis of the VE versus VCO2 slope for the duplicate tests in the males, females, and both sexes combined yielded correlation coefficients of 0.822, 0.942, and 0.910, respectively. The corresponding correlation coefficients for the lowest VE/VCO2 were 0.745, 0.929, and 0.884. A comparison of the test-retest correlation coefficients between the two ventilatory efficiency measures for the men, women, and both sexes combined revealed that they were not significantly different and, for a given index, there were no sex differences. The bias (mean of difference scores between tests) and 95% limits of agreement for the VE versus VCO2 slope in the males, females, and bo...Continue Reading

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Feb 24, 2006·Clinical Physiology and Functional Imaging·James A DavisPatrick H Pham

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Citations

Jan 12, 2010·European Journal of Applied Physiology·Yagesh BhambhaniSaifudin Rashiq
Feb 9, 2012·American Journal of Physical Medicine & Rehabilitation·Yukitaka ShizukudaDouglas R Rosing
May 20, 2015·BMC Pulmonary Medicine·Paloma Lopes Francisco ParazziJose Dirceu Ribeiro
Jan 16, 2007·Medicine and Science in Sports and Exercise·Yukitaka ShizukudaDouglas R Rosing
Jan 23, 2016·The European Respiratory Journal·Luis Puente-MaestuSusan Ward
Apr 16, 2021·European Respiratory Review : an Official Journal of the European Respiratory Society·Susan A Ward

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