Measurement properties of physical tests to assess functional capacity in adults with interstitial lung disease

• Autor(a) principal: Teixeira, Melanie Fernandes
• Data de Publicação: 2023
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10773/40156
• topic: The grocery shelving task; The physical performance test; 1-minute sit and stand test; Handgrip muscle strength; Quadriceps muscle strength; Six-minute walk test; Validity; Reliability

Background: The Grocery Shelving Task (GST) and the Physical Performance Test (PPT) are physical tests that mimic common activities of daily living, and can be carried out in limited spaces. Nevertheless, they have not been validated for the population with interstitial lung disease (ILD). Aim: To assess the validity and reliability of the Grocery Shelving Task (GST) and Physical Performance Test (PPT) in people with ILD. Methods: A cross-sectional observational study was carried out with adults with ILD. Two separate assessments were conducted with a 30min interval, with a presence of a second evaluator during the second assessment. In the first assessment, the GST, PPT, 1min-STS (1-minute sit and stand) , 6minute walking test (6MWT), HGS (handgrip strength test) and QMS (quadriceps muscle strength) were applied. These tests were repeated after 30 min except the 1min-STS and 6MWT, with the presence of a second evaluator. Relative reliability was assessed using the intraclass correlation coefficient (ICC₁,₁ and ICC₂,₁). Absolute reliability was calculated using the standard error of measurement (SEm and Sem%), minimum detectable change (MDC95 and MDC95%) and Bland&Altman method. Construct validity was explored through Spearman(p) and Pearson(r) correlation between the GST and PPT tests with the 1min-STS, HGS, QMS and 6MWT. Results: 58 individuals (age: 64.8±12.7 years; 51.7% males; FVC 84.4±20.7% predicted; DLCO SB 60.8±22.2% predicted) participated in the study. Good to excellent reliability levels were observed for both GST and PPT. Test-retest and intra-rater reliability were good for GST (ICC₁,₁=0.867, 95% CI: 0.757-0.925) and excellent for PPT-28 (ICC₁,₁=0.922, 95% CI: 0.743-0.967). Inter-rater reliability was good for both tests: ICC₂,₁=0.856 (95% CI: 0.748-0.918) for GST and ICC₂,₁=0.819 (95% CI: 0.676-0.900) for PPT-28. The SEM% was 13.2% for GST and 4.6% for PPT-28, and the MDC95% was 36.5% for GST and 12.9% for PPT-28. Bland-Altman 95% limits of agreement showed good concordance without evidence of bias for each test. The mean difference for GST was 4.62 seconds (agreement limits: -16.65, 25.90), and the mean difference for PPT-28 was -1.00 (agreement limits: -3.70, 1.70). GST was negatively and moderately correlated with HGS (r = -0.486, p < 0.001) and 1-minSTS (r = -0.561, p˂0.001) and strongly with 6MWT (r = -0.675, p < 0.001). PPT-28 showed a positive and moderate correlation with HGS (r = 0.472, p < 0.001), and a strong correlation with 6MWT (r = 0.626, p < 0.001) and 1min-STS (r = 0.689, p < 0.001). There was no significant correlations with QMS (GST: r = 0.081, p = 0.550; PPT-28: r = 0.115, p = 0.398). There were no ceiling and floor effects for any of the tests under study. Conclusion: The GST and PPT seem to be valid and reliable measuring instruments for assessing functional capacity in adults with ILD.