RT Journal Article
SR Electronic
T1 Relationship between maximal workload as measured by cardiopulmonary test and equation-estimated values, in COPD
JF European Respiratory Journal
JO Eur Respir J
FD European Respiratory Society
SP P1842
VO 42
IS Suppl 57
A1 Marta Ferrer
A1 Cejudo Pilar
A1 González Hector Hugo
A1 Vázquez Rosa
A1 C. Preciado
A1 Abad Maria
A1 Cadenas Maria Jose
A1 Ortega Francisco
YR 2013
UL http://erj.ersjournals.com/content/42/Suppl_57/P1842.abstract
AB Background: Cardiopulmonary exercise testing (CEPT) is widely used to individualize cycle training intensity in Pulmonary Rehabilitation (PR). However, this test is costly and not always available in the clinical setting. One option would be using prediction equations that estimate peak work rate from distance walked in the incremental Shuttle Walking Test (ISWT).Aims: To compare results in terms of maximum workload obtained from the application of two different equations that estimate Wpeak from distance walked in the SWT, with those obtained from a conventional incremental CPET.Methods: 76 COPD patients (mean FEV1 42.8% predicted) admitted to a PR program were included and they performed CPET and ISWT. Measures of peak workload were then obtained, either directly (CPET) or by estimation from the distance walked (ISWT) using the two currently available equations by Andòrttir and Luxon.Results: Data are expressed as mean (SD). Distance walked in ISWT was 400 (160) m, whereas Wpeak from the CEPT was 60 (24) watts. A significant correlation was found between those two variables: r= 0.738. Wpeak as estimated from the Andòrttir equation was 88.9(33), and 107 (29) watts from the Luxon equation, showing both variables a significant correlation with the Wpeak on the CPET: r=0.733 and r=0.752, respectively.Stepwise multiple regression analyses showed MVV (maximal voluntary ventilation) as the only significant variable, which accounted for no more than 46% of the variance.Conclusions: In our sample, both equations offered an overestimation of the maximum workload in comparison with the direct measure on the CPET.