Poor agreement of objectively measured and self-reported physical activity in juvenile dermatomyositis and juvenile systemic lupus erythematosus

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Citações na Scopus
18
Tipo de produção
article
Data de publicação
2016
Título da Revista
ISSN da Revista
Título do Volume
Editora
SPRINGER LONDON LTD
Citação
CLINICAL RHEUMATOLOGY, v.35, n.6, p.1507-1514, 2016
Projetos de Pesquisa
Unidades Organizacionais
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Resumo
To examine the agreement and association between objectively measured and indirectly assessed physical activity levels in patients with juvenile dermatomyositis (JDM) and juvenile systemic lupus erythematosus (JSLE) patients. The sample consisted of 19 JDM patients (age 8 to 22 years) and 20 JSLE patients (age 9 to 18 years). Physical activity level was objectively measured using ActigraphA (R) accelerometers and indirectly assessed by the short-form International Physical Activity Questionnaire (IPAQ). Spearman's correlation coefficients were calculated to test possible associations between physical activity levels across the two instruments. The Bland-Altman technique was used to calculate bias and limits of agreement. Correlations between objectively measured and indirectly assessed physical activity levels in JDM and JSLE were weak, varying from R = 0.03 to R = 0.33 (all p > 0.05). Total physical activity was correlated between accelerometer and IPAQ in JSLE (R = 0.51, p = 0.021). Bland-Altman analyses suggested that IPAQ tended to highly underestimate sedentary time and light physical activity in JDM (mean bias 105.7 and 199.8 min, respectively) and JSLE (mean bias 36.4 and 127.8 min, respectively). Mean biases of moderate-to-vigorous physical activity were also highly variable, ranging from -42.9 to 54.9 min and -59.4 to 89.8 min for JDM and JSLE, respectively. IPAQ was shown to not be valid to assess physical activity levels in patients with JDM and JSLE when compared against accelerometry. While the validation of reliable self-reported instruments that measure physical activity in pediatric rheumatic patients remains necessary, the use of validated tools that objectively measure physical activity is recommended in both clinical and research settings.
Palavras-chave
Accelerometer, IPAQ, Pediatric rheumatic disease, Physical activity level
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