Compositional patterns of device-measured movement behaviour in juvenile idiopathic arthritis: results from the multicentre ActiMON study
Authors' conclusion
Young people with well-controlled JIA show a distinctly unbalanced movement behaviour composition compared to controls, marked by a predominance of sedentary behaviour-even among those meeting PA guidelines.
Study context
- Population
- Patients aged 10–20 years with juvenile idiopathic arthritis (JIA) and individually matched population controls (mean age 15.0 ± 2.1 years; 67% female)126 matched pairs analysed
- Exposure
- Young people with JIA vs individually matched population controls
- Outcome
- Time-use composition of SB, light-intensity PA and MVPA (accelerometer-measured)
- Follow-up
- Eight consecutive days
Methodological detailsmulticentre, individually matched population controls, hip-worn accelerometers, compositional data analysis, adjusted multivariate analysis of variance (MANOVA)
- Multicentre
- Individually matched population controls
- Hip-worn accelerometers
- Compositional data analysis
- Adjusted MANOVA
Main finding
As reported in the abstract
Time-use composition of waking time (SB, light-intensity PA, MVPA)
| Group | Sedentary behaviour (SB) | Light-intensity physical activity (PA) | Moderate-to-vigorous PA (MVPA) |
|---|---|---|---|
| Patients | 86% | 8% | 6% |
Patients
Sedentary behaviour (SB)86%
Light-intensity physical activity (PA)8%
Moderate-to-vigorous PA (MVPA)6%
- Did not meet WHO recommendation of an average of ≥ 60 min of MVPA per day
- 76%
- Among those meeting it, still spent ≥ 75% of wear time sedentary
- 87%
Observational data: associations, not effects.
Further findings
Correlates of greater proportion of SB relative to PA (JIA)
- Female gender, B = 0.13
- P = 0.042
- Higher age, B = 0.06
- P < 0.001
- Higher BMI, B = 0.01
- P = 0.049
Movement composition vs controls
- JIA spent more time in SB, less in light-intensity PA, and slightly more in vigorous PA than controls (all p < 0.001)
- Group differences remained significant after adjustment and consistent across weekdays and weekends
Original publication
Compositional patterns of device-measured movement behaviour in juvenile idiopathic arthritis: results from the multicentre ActiMON study. Arthritis Res Ther. Published 17 December 2025. doi:10.
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