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Predicting the rate of oxygen consumption during the 3-minute constant-rate stair stepping and shuttle tests in people with chronic obstructive pulmonary disease

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dc.contributor.authorLewthwaite, H.
dc.contributor.authorKoch, E.M.
dc.contributor.authorEkstrom, M.
dc.contributor.authorHamilton, A.
dc.contributor.authorBourbeau, J.
dc.contributor.authorMaltais, F.
dc.contributor.authorBorel, B.
dc.contributor.authorEnsen, D.
dc.date.issued2020
dc.description.abstractBackground: The 3-minute constant-rate stair stepping (3-min CRSST) and constant-speed shuttle tests (3-min CSST) were developed to assess breathlessness in response to a standardized exercise stimulus.Estimating the rate of oxygen consumption (V’O2) during these tests would assist clinicians to relate the stepping/shuttle speeds that elicit breathlessness to daily physical activities with a similar metabolic demand.This study: (I) developed equations to estimate the V’O2 of these tests in people with chronic obstructive pulmonary disease (COPD); and (II) compared the newly developed and American College of Sports Medicine (ACSM) metabolic equations for estimating the V’O2 of these tests.Methods: This study was a retrospective analysis of people with COPD who completed a 3-min CRSST(n=98) or 3-min CSST (n=69). Multivariate linear regression estimated predictors (alpha <0.05) of V’O2 to construct COPD-specific metabolic equations. The mean squared error (MSE) of the COPD-specific and ACSM equations was calculated and compared. Bland-Altman analyses evaluated level of agreement between measured and predicted V’O2 using each equation; limits of agreement (LoA) and patterns of bias were compared. Results: Stepping rate/shuttle speed and body mass were identified as significant predictors of V’O2. The MSE of the COPD-specific equations was 0.05 L·min−1 for both tests. Mean difference between measured and predicted V’O2 was 0.00 L·min−1 (95% LoA −0.46, 0.46) and 0.00 L·min−1 (95% LoA −0.44, 0.44) for the3-min CRSST and 3-min CSST, respectively. For the ACSM metabolic equations, the MSE was 0.10 L·min−1and 0.18 L·min−1 for the 3-min CRSST and 3-min CSST, respectively. The ACSM metabolic equations underestimated V’O2 of the 3-min CRSST by −0.18 L·min−1 (95% LoA −0.68, 0.32), and overestimated V’O2 of the 3-min CSST by 0.35 L·min−1 (95% LoA −0.14, 0.84).Conclusions: This study presents metabolic equations to predict V’O2 of the 3-min CRSST and 3-min CSST for people with COPD that are more accurate than the ACSM metabolic equations.
dc.identifier.citationJournal of Thoracic Disease, 2020; 12(5):2489-2498
dc.identifier.doi10.21037/jtd.2020.03.13
dc.identifier.issn2072-1439
dc.identifier.issn2077-6624
dc.identifier.urihttps://hdl.handle.net/11541.2/143594
dc.language.isoen
dc.publisherPioneer Bioscience Publishing Company
dc.rightsCopyright 2020 Journal of Thoracic Disease. This is an Open Access article distributed in accordance with the Creative Commons Attribution-Non Commercial-No Derivs 4.0 International License (CC BY-NC-ND 4.0) (https://creativecommons.org/licenses/by-nc-nd/4.0/)
dc.source.urihttps://doi.org/10.21037/jtd.2020.03.13
dc.subjectexertional breathlessness
dc.subjectbreathlessness
dc.subjectmetabolic demand
dc.subjectdaily activities
dc.subjectactivities of daily living
dc.titlePredicting the rate of oxygen consumption during the 3-minute constant-rate stair stepping and shuttle tests in people with chronic obstructive pulmonary disease
dc.typeJournal article
pubs.publication-statusPublished
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ror.mmsid9916418607301831

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