Cited by 658Physical Activity and HealthObesity, Physical Activity, DietChildren's Physical and Motor Development

Effectiveness of intervention on physical activity of children: systematic review and meta-analysis of controlled trials with objectively measured outcomes (EarlyBird 54)

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Metcalf, B., Henley, W., Wilkin, T.·2012·BMJ

Abstract

OBJECTIVE: To determine whether, and to what extent, physical activity interventions affect the overall activity levels of children. DESIGN: Systematic review and meta-analysis. DATA SOURCES: Electronic databases (Embase, Medline, PsycINFO, SPORTDiscus) and reference lists of included studies and of relevant review articles. STUDY SELECTION: Design: randomised controlled trials or controlled clinical trials (cluster and individual) published in peer reviewed journals. INTERVENTION: incorporated a component designed to increase the physical activity of children/adolescents and was at least four weeks in duration. OUTCOMES: measured whole day physical activity objectively with accelerometers either before or immediately after the end of the intervention period. DATA ANALYSIS: INTERVENTION effects (standardised mean differences) were calculated for total physical activity, time spent in moderate or vigorous physical activity, or both for each study and pooled using a weighted random effects model. Meta-regression explored the heterogeneity of intervention effects in relation to study participants, design, intervention type, and methodological quality. RESULTS: Thirty studies (involving 14,326 participants; 6153 with accelerometer measured physical activity) met the inclusion criteria and all were eligible for meta-analysis/meta-regression. The pooled intervention effect across all studies was small to negligible for total physical activity (standardised mean difference 0.12, 95% confidence interval 0.04 to 0.20; P<0.01) and small for moderate or vigorous activity (0.16, 0.08 to 0.24; P<0.001). Meta-regression indicated that the pooled intervention effect did not differ significantly between any of the subgroups (for example, for total physical activity, standardised mean differences were 0.07 for age <10 years and 0.16 for ≥ 10 years, P=0.19; 0.07 for body mass index across the entire range and 0.22 for exclusively overweight/obese children, P=0.07; 0.12 for study duration ≤ 6 months and 0.09 for >6 months, P=0.71; 0.15 for home/family based intervention and 0.10 for school based intervention, P=0.53; and 0.09 for higher quality studies and 0.14 for lower quality studies, P=0.52). CONCLUSIONS: This review provides strong evidence that physical activity interventions have had only a small effect (approximately 4 minutes more walking or running per day) on children's overall activity levels. This finding may explain, in part, why such interventions have had limited success in reducing the body mass index or body fat of children.

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  • These effect sizes are small but are comparable to findings from other school based interventions.

    “These effect sizes are small but are comparable to findings from other school based interventions [86-88].”
  • The effects of interventions using accelerometers to increase the overall physical activity of children and adolescents are generally reported to be negligible or small for moderate or vigorous-intensity physical activity interventions, regardless of age, BMI (overweight/obese) or implementation setting (home/family or school).

    “However, the effects of interventions using accelerometers to increase the overall physical activity of children and adolescents are generally reported to be negligible or small for moderate or vigorous-intensity physical activity interventions, regardless of age, BMI (overweight/obese) or implementation setting (home/family or school).119”
  • There is some evidence that intervention strategies based at the school, home/family or community/neighbourhood level can increase physical activity in children and adolescents.

    “There is some evidence that intervention strategies based at the school, home/family or community/neighbourhood level can increase physical activity in children and adolescents.115–120”
  • A number of existing systematic reviews of school-based PA interventions, as well as Beets et al., highlighted the potential risk that the intervention might increase PA during actual intervention delivery but result in a compensatory decline elsewhere during the day.

    “A number of existing systematic reviews of school-based PA interventions,28, 104 as well as Beets et al.,37 highlighted the potential risk that the intervention might increase PA during actual intervention delivery but result in a compensatory decline elsewhere during the day.”

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Authors
Metcalf, B., Henley, W., & Wilkin, T.
Affiliations
  • Peninsula College of Medicine and Dentistry (GB)
  • University of Exeter (GB)
Corresponding author
Metcalf, B.
Venue
BMJ
Publisher
BMJ
Published
2012-09-27
Volume
345
Issue
sep27 1
Pages
e5888-e5888
ISSN
1756-1833 (ISSN-L)
OpenAlex
W2025533609
Cited by
658
References
78
Citations by year
2026: 13 · 2025: 21 · 2024: 36 · 2023: 26 · 2022: 66 · 2021: 49 · 2020: 58 · 2019: 51 · 2018: 51 · 2017: 57 · 2016: 83 · 2015: 59 · 2014: 46 · 2013: 35 · 2012: 7
FWCI
4.99
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • BMJ (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Figshare (submittedVersion)
  • Open Research Exeter (University of Exeter) (submittedVersion)
Funders
National Institute for Health and Care Research
Topics
  • Health Sciences › Medicine › Physiology › Physical Activity and Health
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Obesity, Physical Activity, Diet
  • Social Sciences › Psychology › Developmental and Educational Psychology › Children's Physical and Motor Development
Keywords
physical activity interventions, children, adolescents, moderate-to-vigorous physical activity, accelerometer-measured activity, intervention effectiveness, school-based intervention, home-based intervention, body mass index, overweight and obesity, intervention quality, study duration, physical activity promotion, sedentary behavior, sleep duration, screen time
MeSH terms
Adolescent, Child, Clinical Trials as Topic, Female, Health Promotion, Humans, Male, Motor Activity, Obesity, Exercise

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