Physical activity patterns in nonobese and obese children assessed using minute-by-minute accelerometry

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Abstract
OBJECTIVE: To determine the levels and patterns of physical activity in a sample of obese (≥99th percentile body mass index (BMI)) and nonobese (vs 41 844±10 430 counts/h; 95% confidence interval 4407 to 15592; P=0.001). Similarly the obese children spent less time in physical activity of moderate or greater intensity than the nonobese children (9.9±3.9 vs 12.9±4.2 min/h; 95% confidence interval 1.15 to 4.80; P=0.002). Hourly patterns of activity indicated a tendency in obese children to be less active than nonobese children at times when activity was more likely to be determined by free choice, particularly outside of school time. CONCLUSIONS: Obese children demonstrated patterns of physical activity that may have contributed to and are likely to sustain their obesity. Minute-by-minute accelerometry is a valuable tool to investigate physical activity patterns in obese children. It can identify periods when intervention to increase activity may be most appropriate and provide an evidence base for specific exercise prescription in primary and secondary care. SPONSORSHIP: Health Education Authority, NHS R& D South–West