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Effect of a general school-based physical activity intervention on bone mineral content and density: a cluster-randomized controlled trial

Meyer, U. and Romann, M. and Zahner, L. and Schindler, C. and Puder, J. J. and Kraenzlin, M. and Rizzoli, R. and Kriemler, S.. (2011) Effect of a general school-based physical activity intervention on bone mineral content and density: a cluster-randomized controlled trial. Bone, 48 (4). pp. 792-797.

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Official URL: http://edoc.unibas.ch/dok/A6002174

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Abstract

BACKGROUND: Specific physical loading leads to enhanced bone development during childhood. A general physical activity program mimicking a real-life situation was successful at increasing general physical health in children. Yet, it is not clear whether it can equally increase bone mineral mass. We performed a cluster-randomized controlled trial in children of both gender and different pubertal stages to determine whether a school-based physical activity (PA) program during one school-year influences bone mineral content (BMC) and density (BMD), irrespective of gender. METHODS: Twenty-eight 1st and 5th grade (6-7 and 11-12year-old) classes were cluster randomized to an intervention (INT, 16 classes, n=297) and control (CON; 12 classes, n=205) group. The intervention consisted of a multi-component PA intervention including daily physical education with at least ten minutes of jumping or strength training exercises of various intensity. Measurements included anthropometry, and BMC and BMD of total body, femoral neck, total hip and lumbar spine using dual-energy X-ray absorptiometry (DXA). PA was assessed by accelerometers and tanner stages by questionnaires. Analyses were performed by a regression model adjusted for gender, baseline height and weight, baseline PA, post-intervention pubertal stage, baseline BMC, and cluster. RESULTS: 275 (72%) of 380 children who initially agreed to have DXA measurements had also post-intervention DXA and PA data. Mean age of prepubertal and pubertal children at baseline was 8.7+/-2.1 and 11.1+/-0.6years, respectively. Compared to CON, children in INT showed statistically significant increases in BMC of total body, femoral neck, and lumbar spine by 5.5%, 5.4% and 4.7% (all p>0.05), respectively, and BMD of total body and lumbar spine by 8.4% and 7.3% (both p>0.01), respectively. There was no gender*group, but a pubertal stage*group interaction consistently favoring prepubertal children. CONCLUSION: A general school-based P intervention can increase bone health in elementary school children of both genders, particularly before puberty
Faculties and Departments:03 Faculty of Medicine > Bereich Medizinische Fächer (Klinik) > Endokrinologie / Diabetologie
03 Faculty of Medicine > Departement Klinische Forschung > Bereich Medizinische Fächer (Klinik) > Endokrinologie / Diabetologie
03 Faculty of Medicine > Departement Public Health > Sozial- und Präventivmedizin
09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Department of Epidemiology and Public Health (EPH) > Biostatistics > Biostatistics - Frequency Modelling (Schindler)
09 Associated Institutions > Swiss Tropical and Public Health Institute (Swiss TPH) > Former Units within Swiss TPH > Physical Activity and Health (Kriemler)
UniBasel Contributors:Schindler, Christian and Kraenzlin, Marius E. and Kriemler, Susi and Puder, Jardena and Zahner, Lukas
Item Type:Article, refereed
Bibsysno:Link to catalogue
Publisher:Elsevier
ISSN:8756-3282
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:06 Oct 2017 09:35
Deposited On:08 Nov 2012 16:16

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