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Which type of sedentary behaviour intervention is more effective at reducing body mass index in children? A
1Department of Preventive Medicine, Institute for Health Promotion and Disease Prevention Research, University of Southern California, Los Angeles, CA, USA.
Insights
Reducing sedentary behaviour in children shows a significant effect on body mass index (BMI) reduction. However, combining interventions did not yield greater BMI reduction than single-component approaches alone.
Area of Science:
- Pediatrics
- Public Health
- Obesity Research
Background:
- Sedentary behavior is a recognized risk factor for childhood obesity.
- Previous research suggests limiting sedentary time may reduce Body Mass Index (BMI).
- The additive effect of multi-component interventions (sedentary behavior, physical activity, diet) on BMI is not well understood.
Purpose of the Study:
- To evaluate the overall impact of sedentary behavior interventions on BMI reduction in children.
- To compare the effectiveness of multi-component interventions versus single-component interventions for BMI reduction.
Main Methods:
- Meta-analysis of 25 randomized controlled trials involving children under 18.
- Interventions focused on reducing sedentary behavior, with BMI measured pre- and post-intervention.
- Effect size calculated as mean difference in BMI change between intervention and control groups.
Main Results:
- Sedentary behavior interventions demonstrated a significant effect on reducing children's BMI.
- Pooled effect sizes for multi-component interventions were not significantly different from single-component interventions.
- Neither single-component nor multi-component interventions showed a statistically significant effect size independently.
Conclusions:
- Sedentary behavior interventions are effective in reducing pediatric BMI.
- Current evidence does not support an additive benefit of combining sedentary behavior reduction with physical activity and diet interventions.
- Future interventions should focus on strategies targeting multiple screen-related sedentary behaviors to combat childhood obesity.
Abstract:
Sedentary behaviour is emerging as an independent risk factor for paediatric obesity. Some evidence suggests that limiting sedentary behaviour alone could be effective in reducing body mass index (BMI) in children. However, whether adding physical activity and diet-focused components to sedentary behaviour reduction interventions could lead to an additive effect is unclear. This meta-analysis aims to assess the overall effect size of sedentary behaviour interventions on BMI reduction and to compare whether interventions that have multiple components (sedentary behaviour, physical activity and diet) have a higher mean effect size than interventions with single (sedentary behaviour) component. Included studies (n = 25) were randomized controlled trials of children (<18 years) with intervention components aimed to reduce sedentary behaviour and measured BMI at pre- and post-intervention. Effect size was calculated as the mean difference in BMI change between children in an intervention group and a control group. Results indicated that sedentary behaviour interventions had a significant effect on BMI reduction. The pooled effect sizes of multi-component interventions (g = -0.060∼-0.089) did not differ from the single-component interventions (g = -0.154), and neither of them had a significant effect size on its own. Future paediatric obesity interventions may consider focusing on developing strategies to decrease multiple screen-related sedentary behaviours.
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