Systematic Umbrella Review and Meta-Meta-Analysis: Effectiveness of Physical Activity in Improving Depression and Anxiety in Children and Adolescents.

This umbrella review pooled evidence from 21 systematic reviews and meta-analyses, covering 375 randomized controlled trials and over 38,000 children and adolescents aged 5 to 18, to examine whether exercise reduces symptoms of depression and anxiety. Participants included those with clinical conditions like depression, obesity, and cancer, as well as healthy youth. The pooled analysis found a moderate effect favoring exercise for depression (180 RCTs, 34,490 participants) and anxiety (55 RCTs, 24,797 participants).

Mixed-mode and moderate-intensity exercise showed the largest effects for depression, while resistance exercise appeared most effective for anxiety, and shorter programs (under 12 weeks) outperformed longer ones for depression. Heterogeneity across studies was substantial, and certainty of evidence was rated moderate for depression and low to moderate for anxiety, meaning further research could change these estimates. Because this is a review of reviews, results reflect variability in the quality and design of underlying trials rather than a single controlled study.

This large review looked at whether exercise helps children and teenagers with symptoms of depression and anxiety. Researchers combined findings from 21 earlier reviews, which together included 375 clinical trials and more than 38,000 young people between ages 5 and 18.

Some had diagnosed depression or other conditions like obesity or cancer, while others were healthy. Overall, exercise was linked to a moderate reduction in both depression and anxiety symptoms. Programs mixing different types of exercise, or done at moderate intensity, seemed to help most with depression, while resistance training (like using weights or resistance bands) stood out for anxiety.

Shorter programs, under 12 weeks, showed greater benefit for depression than longer ones. However, the studies varied a lot in design and results, and the overall certainty of the evidence was rated moderate for depression and low to moderate for anxiety. This means the true size of the benefit is not fully certain and could shift as more research emerges.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This umbrella review and meta-meta-analysis synthesized 21 systematic reviews (375 RCTs, n=38,117, ages 5-18) examining exercise effects on depression and anxiety symptoms in youth. Pooled effect sizes were moderate for depression (SMD -0.45, 95% CI -0.59 to -0.31, 180 RCTs, n=34,490) and anxiety (SMD -0.39, 95% CI -0.61 to -0.17, 55 RCTs, n=24,797), both with substantial heterogeneity (I2 71.37% and 68.1% respectively). Subgroup findings suggested mixed-mode and moderate-intensity exercise had the largest effects for depression, resistance training for anxiety, and interventions under 12 weeks outperformed longer ones for depression.

Benefits appeared broadly consistent across clinical and healthy populations, though risk of bias was assessed via AMSTAR-2 and certainty rated moderate for depression, low to moderate for anxiety using GRADE. As an umbrella review, findings depend on the quality and overlap of underlying meta-analyses, and high heterogeneity limits precision of pooled estimates. The moderate-to-low certainty ratings and variable intervention parameters (duration, intensity, mode) indicate the evidence base, while extensive, still carries meaningful uncertainty about optimal dosing and mechanisms.