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Background <p>Children and adolescents with juvenile idiopathic arthritis (JIA) are at increased risk for long-term physical and psychosocial complications, making physical activity (PA) and sedentary behaviour (SB) key modifiable lifestyle factors. Although increasingly acknowledged as relevant, data on the daily distribution of these behaviours in JIA remain scarce. This study aimed to (1) describe the time-use composition of SB and PA intensities in young people with JIA, (2) identify correlates of greater relative time spent in SB, and (3) compare movement behaviour patterns to matched population controls using a compositional data analysis (CoDA) approach.</p> Methods <p>Patients aged 10–20 years with JIA and individually matched population controls wore hip-worn accelerometers (ActiGraph wGT3X-BT) for eight consecutive days. Movement behaviours were categorized into SB, light-intensity PA, and moderate-to-vigorous PA (MVPA) using validated, age-specific cut-points. CoDA with log-ratio transformations was used to model associations and compare groups. Diifferences in movement composition were assessed using adjusted multivariate analysis of variance (MANOVA).</p> Results <p>Data from 126 matched pairs (mean age: 15.0 ± 2.1 years; 67% female) were analysed. Patients spent, on average, 86% of waking time in SB, 8% in light-intensity PA, and 6% in MVPA. Overall, 76% did not meet the WHO recommendation of an average of ≥ 60&#xa0;min of MVPA per day. Among those who did, 87% still spent ≥ 75% of their wear time sedentary. A greater proportion of SB relative to PA was associated with female gender (B = 0.13; <i>p</i> = 0.042), higher age (B = 0.06; <i>p</i> &lt; 0.001), and higher BMI (B = 0.01; <i>p</i> = 0.049). Compared to controls, patients spent more time in SB, less in light-intensity PA, and slightly more in vigorous PA (all <i>p</i> &lt; 0.001). Group differences remained significant after adjustment and were consistent across weekdays and weekends.</p> Conclusions <p>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. This highlights the limitations of threshold-based definitions and underscores the importance of assessing full daily movement patterns. Promoting light-intensity PA may offer a feasible strategy to reduce sedentary time, particularly in girls, older adolescents, and individuals with higher BMI.</p> Trial registration <p>The study was registered in the German Clinical Trials Register (DRKS00022258).</p>

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Compositional patterns of device-measured movement behaviour in juvenile idiopathic arthritis: results from the multicentre ActiMON study

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月17日

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  • Florian Milatz,
  • Lisa Voigt,
  • Jens Klotsche,
  • Samuel Tomczyk,
  • Tilmann Kallinich,
  • Ralf Trauzeddel,
  • Daniel Windschall,
  • Sandra Hansmann,
  • Nadja Baumeister,
  • Johannes-Peter Haas,
  • Moritz Klaas,
  • Hermann Girschick,
  • Joachim Peitz-Kornbrust,
  • Peter Böhm,
  • Julius Wiegand,
  • Stefan N. Willich,
  • Alexander Burchartz,
  • Kirsten Minden

摘要

Background

Children and adolescents with juvenile idiopathic arthritis (JIA) are at increased risk for long-term physical and psychosocial complications, making physical activity (PA) and sedentary behaviour (SB) key modifiable lifestyle factors. Although increasingly acknowledged as relevant, data on the daily distribution of these behaviours in JIA remain scarce. This study aimed to (1) describe the time-use composition of SB and PA intensities in young people with JIA, (2) identify correlates of greater relative time spent in SB, and (3) compare movement behaviour patterns to matched population controls using a compositional data analysis (CoDA) approach.

Methods

Patients aged 10–20 years with JIA and individually matched population controls wore hip-worn accelerometers (ActiGraph wGT3X-BT) for eight consecutive days. Movement behaviours were categorized into SB, light-intensity PA, and moderate-to-vigorous PA (MVPA) using validated, age-specific cut-points. CoDA with log-ratio transformations was used to model associations and compare groups. Diifferences in movement composition were assessed using adjusted multivariate analysis of variance (MANOVA).

Results

Data from 126 matched pairs (mean age: 15.0 ± 2.1 years; 67% female) were analysed. Patients spent, on average, 86% of waking time in SB, 8% in light-intensity PA, and 6% in MVPA. Overall, 76% did not meet the WHO recommendation of an average of ≥ 60 min of MVPA per day. Among those who did, 87% still spent ≥ 75% of their wear time sedentary. A greater proportion of SB relative to PA was associated with female gender (B = 0.13; p = 0.042), higher age (B = 0.06; p < 0.001), and higher BMI (B = 0.01; p = 0.049). Compared to controls, patients spent more time in SB, less in light-intensity PA, and slightly more in vigorous PA (all p < 0.001). Group differences remained significant after adjustment and were consistent across weekdays and weekends.

Conclusions

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. This highlights the limitations of threshold-based definitions and underscores the importance of assessing full daily movement patterns. Promoting light-intensity PA may offer a feasible strategy to reduce sedentary time, particularly in girls, older adolescents, and individuals with higher BMI.

Trial registration

The study was registered in the German Clinical Trials Register (DRKS00022258).