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Assessment of an after-school physical activity program to prevent obesity among 9- to 10-year-old children: a cluster randomized trial

Abstract

Objective:

To assess the impact of a physical activity program on obesity in primary school children.

Design:

Cluster-randomized controlled trial with 10 intervention and 10 control schools.

Participants:

A total of 1044 children, mean age 9.4 years (s.d.=0.7) at baseline, of the Province of Cuenca, Spain.

Intervention:

Recreational, non-competitive physical activity program conducted after school hours on school premises. The program consisted of three 90-min sessions per week, for 24 weeks.

Main outcome measures:

Body mass index (BMI), triceps skin-fold thickness (TST) and percentage body fat. Secondary measures were blood lipids and blood pressure. Measurements were made at the beginning (September 2004) and at the end of the program (June 2005). Since schools rather than children were randomized, mixed regression models were used to adjust for individual-level covariates under cluster randomization.

Results:

There were no differences in BMI between the intervention and control groups. Compared with controls, intervention children showed a decrease in TST in both boys (−1.14 mm; 95% confidence interval (CI) −1.71 to −057; P<0.001) and girls (−1.55 mm; 95% CI −2.38 to −0.73; P<0.001), as well as a reduction in the percentage of body fat in girls (−0.58%; 95% CI −1.04 to −0.11; P=0.02). Furthermore, the intervention boys exhibited a decrease in apolipoprotein (apo) B levels (−4.59; 95% CI −8.81 to −0.37; P=0.03) and an increase in apo A-I levels (13.57; 95% CI 7.95–19.20; P<0.001). Blood lipid results in girls were very similar. No changes in total cholesterol, triglycerides or blood pressure were associated with the intervention in either sex, except for an increase in diastolic blood pressure (1.55 mm Hg; 95% CI 0.19–2.91; P=0.03) in the intervention versus control boys.

Conclusion:

An after-school program of recreational physical activity reduced adiposity, increased apo A-I and decreased apo B in primary school children.

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Acknowledgements

We thank the schools, families and children for their enthusiastic participation in the study. This study was funded mainly by La Consejería de Sanidad de Castilla-La Mancha (grant GC03060-00). Additional funding was obtained from the Ministerio de Sanidad y Consumo, Instituto de Salud Carlos III, Red de Investigación en Actividades Preventivas y de Promoción de Salud (grant RD06/0018/0038). VMV was the principal researcher and guarantor. VMV and FSA designed the study, together with FRA who helped to refine the study design. VMV and FSA coordinated data collection. RFG and SSM made biochemical determinations. MSL designed and coordinated the implementation of the physical activity program. MSM and ELG conducted statistical analysis, and all the authors contributed to the interpretation of results. VMV and FRA drafted the paper and all the authors critically reviewed it for scientific content and approved the final version.

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Correspondence to V Martínez Vizcaíno.

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Martínez Vizcaíno, V., Salcedo Aguilar, F., Franquelo Gutiérrez, R. et al. Assessment of an after-school physical activity program to prevent obesity among 9- to 10-year-old children: a cluster randomized trial. Int J Obes 32, 12–22 (2008). https://doi.org/10.1038/sj.ijo.0803738

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