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Article Abstract
Background And Objective: We investigated the repeatability and validity of the incremental shuttle walk test (ISWT) distance compared to peak oxygen uptake (VO ) during maximal incremental cycle ergometer (ICE) and treadmill (ITM) tests in adults with severe asthma.
Methods: Adults with severe asthma, Medical Research Council (MRC) dyspnoea ≥2, were recruited from specialists caring for patients with severe asthma. All participants performed three ISWT (familiarization and two subsequent tests on the same day), an ICE and an ITM in a randomized order, on separate days, to intolerance with expiratory gas analysis.
Results: A total of 50 patients (32 females, mean (SD), age: 54 (13) years, forced expiratory volume in 1 s (FEV ): 1.9 (0.8) L and body mass index (BMI): 32 (6) kg/m ) completed all five tests. The mean (SD) ISWT distance for each test was 400 (156), 418 (142) and 438 (157) m (P = 0.001), respectively. There was a strong correlation between the ISWT distance with VO derived from ITM (r = 0.74, P < 0.001) and ICE (r = 0.75, P < 0.001).
Conclusion: There was a small increase in the mean ISWT distance on sequential testing. In clinical practice, the coefficient of repeatability and heteroscedasticity need to be considered when assessing whether a true change has occurred within an individual patient. The ISWT has validity compared to VO on both ICE and ITM, but they are not interchangeable.
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| http://dx.doi.org/10.1111/resp.13519 | DOI Listing |
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