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Multicenter Study
. 2021 Jun 29;19(1):97.
doi: 10.1186/s12969-021-00584-4.

Clinical and psychosocial stress factors are associated with decline in physical activity over time in children with juvenile idiopathic arthritis

Affiliations
Multicenter Study

Clinical and psychosocial stress factors are associated with decline in physical activity over time in children with juvenile idiopathic arthritis

Liane D Heale et al. Pediatr Rheumatol Online J. .

Abstract

Background: Physical activity (PA) patterns in children with juvenile idiopathic arthritis (JIA) over time are not well described. The aim of this study was to describe associations of physical activity (PA) with disease activity, function, pain, and psychosocial stress in the 2 years following diagnosis in an inception cohort of children with juvenile idiopathic arthritis (JIA).

Methods: In 82 children with newly diagnosed JIA, PA levels, prospectively determined at enrollment, 12 and 24 months using the Physical Activity Questionnaire for Children (PAQ-C) and Adolescents (PAQ-A) raw scores, were evaluated in relation to disease activity as reflected by arthritis activity (Juvenile Arthritis Disease Activity Score (JADAS-71)), function, pain, and psychosocial stresses using a linear mixed model approach. Results in the JIA cohort were compared to normative Pediatric Bone Mineral Accrual Study data derived from healthy children using z-scores.

Results: At enrollment, PA z-score levels of study participants were lower than those in the normative population (median z-score - 0.356; p = 0.005). At enrollment, PA raw scores were negatively associated with the psychosocial domain of the Juvenile Arthritis Quality of Life Questionnaire (r = - 0.251; p = 0.023). There was a significant decline in PAQ-C/A raw scores from baseline (median and IQR: 2.6, 1.4-3.1) to 24 months (median and IQR: 2.1, 1.4-2.7; p = 0.003). The linear mixed-effect model showed that PAQ-C/A raw scores in children with JIA decreased as age, disease duration, and ESR increased. The PAQ-C/A raw scores of the participants was also negatively influenced by an increase in disease activity as measured by the JADAS-71 (p < 0.001).

Conclusion: Canadian children with newly diagnosed JIA have lower PA levels than healthy children. The decline in PA levels over time was associated with disease activity and higher disease-specific psychosocial stress.

Keywords: Juvenile arthritis; Physical activity; Psychosocial stress.

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Conflict of interest statement

None identified. The authors declare that they have no competing interests.

Figures

Fig. 1
Fig. 1
Correlation heat map at baseline. BMI, body mass index; PAQ-C/A score, physical activity questionnaire for children and adolescents; JADAS-71, Juvenile Arthritis Disease Activity Score; CHAQ, Child Health Assessment Questionnaire; JAQQ, Juvenile Arthritis Quality of Life Questionnaire; SLEC, Stressful Life Events Checklist
Fig. 2
Fig. 2
Boxplot of PAQ-C/A raw score at baseline, 12 and 24 months follow up. * There was a significant change in PAQ score from baseline to 24-month (p = 0.003)
Fig. 3
Fig. 3
a Physical activity scores (PAQ-C/A) over time in children with low number of active joints (dark circle) and high number of active joints (open square). PAQ-C/A data is logarithmically transformed, fixed effect coefficient from LME model. b Physical activity scores (PAQC/A) over time in children with low ESR (dark circle) and high ESR (open square). PAQ-C/A data is logarithmically transformed, fixed effect coefficient from LME model

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