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The minimal detectable difference for endurance shuttle walk test performance in people with COPD on completion of a program of high-intensity ground-based walking
Journal article   Open access   Peer reviewed

The minimal detectable difference for endurance shuttle walk test performance in people with COPD on completion of a program of high-intensity ground-based walking

Kylie Hill, Cindy Ng, Sally L. Wootton, Zoe J. McKeough, Peter R. Eastwood, David R. Hillman, Christine Jenkins, Lissa Spencer, Sue C. Jenkins, Nola M. Cecins, …
Respiratory medicine, Vol.146, pp.18-22
2019
DOI: https://doi.org/10.1016/j.rmed.2018.11.013
PMID: 30665513
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Abstract

Chronic obstructive pulmonary disease Endurance shuttle walk test Exercise training Minimal detectable difference
Background In people with moderate-to-severe chronic obstructive pulmonary disease (COPD), the minimal detectable difference (MDD) in endurance shuttle walk test (ESWT) performance following exercise training is unclear. We sought to determine the MDD for ESWT performance following supervised ground-based walking training using anchor- and distribution-based approaches and report whether these values exceeded random variation in test performance. Methods Participants with COPD trained for 30–45 min, 2–3 times weekly for 8–10 weeks. The ESWT was performed before and after the training period. Immediately after training, participants rated their change in walking ability using a Global Rating of Change scale. Receiver Operating Characteristic curves were used to derive the value that best separated those who perceived their improvement in walking ability to be at least ‘a little’ better from ‘almost the same, hardly any change’. These values were compared with those calculated using a distribution-based method. Random variation in test performance was defined as the minimal detectable change (MDC), calculated using the standard error of measurement. Results 78 participants (aged 70 ± 8 yr and FEV1 43 ± 15% predicted) completed the ESWT before and after training. The value that best separated those who perceived their walking ability as ‘a little’ better was 70 s. The 95% confidence intervals around this estimate traversed zero. The distribution-based estimate was 156 s. The MDC was 227 s. Conclusions The MDD established using the anchor- and distribution-based approaches differed considerably. Large variation in test performance cautions against using the MDD to interpret changes in an individual.

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26 Record Views
2 Times Cited - Web of Science

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Collaboration types
Domestic collaboration
International collaboration
Citation topics
1 Clinical & Life Sciences
1.65 Allergy
1.65.192 COPD
Web Of Science research areas
Cardiac & Cardiovascular Systems
Respiratory System
ESI research areas
Clinical Medicine
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