Abstract
Objective:
To examine the changes over time in cardiorespiratory fitness and body mass index (BMI) of children.
Design:
Serial cross-sectional, population-based study.
Setting:
Primary schools in Liverpool, UK.
Participants:
A total of 15 621 children (50% boys), representing 74% of eligible 9–11-year olds in the annual school cohorts between 1998/9 and 2003/4, who took part in a 20m multi-stage shuttle run test (20mMST).
Main outcome measures:
Weight, height, BMI (kg/m2) and obesity using the International Obesity Taskforce definition.
Results:
Median (95% confidence interval) 20mMST score (number of runs) fell in boys from 48.9 (47.9–49.9) in 1998/9 to 38.1 (36.8–39.4) in 2003/4, and in girls from 35.8 (35.0–36.6) to 28.1 (27.2–29.1) over the same period. Fitness scores fell across all strata of BMI (P<0.001). Moreover, BMI increased over the same 6-year period even among children in fittest third of 20mMST.
Conclusion:
In a series of uniform cross-sectional assessments of school-aged children, BMI increased whereas cardiorespiratory fitness levels decreased within a 6-year period. Even among lean children, fitness scores decreased. Public health measures to reduce obesity, such as increasing physical activity, may help raise fitness levels among all children – not just the overweight or obese.
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Acknowledgements
We thank Liz Lamb for managing the programme and Glen Groves, Vicci Allan and Jenny for collecting the data. The SportsLinx project was funded by Liverpool City Council, Liverpool John Moores University, The Children's Fund and the Neighbourhood Renewal Fund.
Contributors: GS and AFH designed the Sportslinx project. GS noticed a downward trend in cardiorespiratory fitness and upward trend in BMI after the initial analysis and interpretation of the data and led the initial writing of the manuscript. SRT and LMB managed the data and contributed to the manuscript. IEB performed the statistical analysis, interpreted the findings and led the second draft of the manuscript. DC contributed to statistical analysis, interpretation and subsequent drafts of the manuscript. GS is the guarantor of the paper.
Ethics: Ethics approval has been given by Liverpool John Moores University ethics committee and the Royal Liverpool Children's Hospital Ethics Committee.
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Stratton, G., Canoy, D., Boddy, L. et al. Cardiorespiratory fitness and body mass index of 9–11-year-old English children: a serial cross-sectional study from 1998 to 2004. Int J Obes 31, 1172–1178 (2007). https://doi.org/10.1038/sj.ijo.0803562
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DOI: https://doi.org/10.1038/sj.ijo.0803562
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