Measurement properties of the incremental step test for people with chronic obstructive pulmonary disease: a cross-sectional study

ObjectivesThe new incremental step test (IST) is a field test that was developed for people with chronic obstructive pulmonary disease (COPD), based on the characteristics of the incremental shuttle walk test (ISWT); however, its measurement properties still need to be determined. We aimed, first, t...

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Bibliographic Details
Published in:BMJ open 2024-02, Vol.14 (2), p.e078425-e078425
Main Authors: Gonçalves, Tânia, Carlos Winck, João, Silva, Fátima, Caneiras, Cátia, Montes, António Mesquita, Vilarinho, Rui
Format: Article
Language:English
Subjects:
Chronic airways disease
Chronic obstructive pulmonary disease
Cross-Sectional Studies
Data collection
Dyspnea
Exercise Test
Field study
GERIATRIC MEDICINE
Humans
Hypotheses
Informed consent
Lung diseases
Pulmonary Disease, Chronic Obstructive - diagnosis
Rehabilitation Medicine
Reproducibility of Results
Sociodemographics
Validation studies
Validity
Walk Test
Walking
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Summary:ObjectivesThe new incremental step test (IST) is a field test that was developed for people with chronic obstructive pulmonary disease (COPD), based on the characteristics of the incremental shuttle walk test (ISWT); however, its measurement properties still need to be determined. We aimed, first, to assess the construct validity (through the comparison with the ISWT), within-day reliability and measurement error of the IST in people with COPD; and, second, to identify whether the participants have a learning effect in the IST.DesignCross-sectional study, conducted according to COnsensus-based Standards for the selection of health status Measurement INstruments guidelines.SettingA family health unit in Portugal, April 2022 to June 2023.Participants and analysis63 participants (67.5±10.5 years) attended two sessions to perform two IST and two ISWT, separately. Spearman’s correlations were used to compare the best performances between the IST and the ISWT. Intraclass correlation coefficient (ICC2,1) was used for reliability, and the SE of measurement (SEM), minimal detectable change at 95% CI (MDC95) and Bland and Altman 95% limits of agreement (LoA) were used for measurement error. The learning effect was explored with the Wilcoxon signed-rank test.ResultsThe IST was significant and strongly correlated with the ISWT (0.72
ISSN:2044-6055
2044-6055
DOI:10.1136/bmjopen-2023-078425