Page A, Cooper A R, Stamatakis E, Foster L J, Crowne E C, Sabin M, Shield J P H
Department of Exercise and Health Sciences, Centre for Sport, Exercise and Health, University of Bristol, Tyndall Avenue, Bristol BS8 1TP, UK.
Int J Obes (Lond). 2005 Sep;29(9):1070-6. doi: 10.1038/sj.ijo.0802993.
To determine the levels and patterns of physical activity in a sample of obese (> or =99th percentile body mass index (BMI)) and nonobese (<99th percentile BMI) children.
Cross-sectional study.
Children were recruited from schools in Bristol and from the childhood obesity clinic, Bristol Royal Hospital for Children. Children were instructed in the use of the accelerometer either while at school or in the clinic, and wore the instrument while carrying out their normal daily activities for 7 days.
A total of 133 children (mean age 10.5+/-0.8 y). In all 11 (16.9%) of the 65 girls and 14 (20.6%) of the 68 boys were classified as obese (above the 99th percentile for BMI and corresponding to projected adult BMI of 30).
Objectively measured physical activity volume, intensity and pattern.
Obese children were significantly less physically active overall than their nonobese counterparts (31,844+/-13,200 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.
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.
确定肥胖儿童（体重指数（BMI）≥第99百分位数）和非肥胖儿童（BMI＜第99百分位数）样本中的身体活动水平和模式。
横断面研究。
儿童从布里斯托尔的学校以及布里斯托尔皇家儿童医院的儿童肥胖诊所招募。儿童在学校或诊所接受使用加速度计的指导，并在进行正常日常活动时佩戴该仪器7天。
共133名儿童（平均年龄10.5±0.8岁）。65名女孩中有11名（16.9%）、68名男孩中有14名（20.6%）被归类为肥胖（BMI高于第99百分位数，预计成人BMI为30）。
客观测量的身体活动量、强度和模式。
肥胖儿童总体身体活动明显少于非肥胖儿童（31844±13200对41844±10430计数/小时；95%置信区间4407至15592；P = 0.001）。同样，肥胖儿童进行中等强度或更高强度身体活动的时间比非肥胖儿童少（9.9±3.9对12.9±4.2分钟/小时；95%置信区间1.15至4.80；P = 0.002）。每小时的活动模式表明，在活动更可能由自由选择决定时，尤其是在学校时间之外，肥胖儿童比非肥胖儿童活跃度更低。
肥胖儿童表现出的身体活动模式可能导致并维持了他们的肥胖。逐分钟的加速度测量是研究肥胖儿童身体活动模式的有价值工具。它可以确定增加活动干预可能最合适的时期，并为初级和二级保健中的特定运动处方提供证据基础。
