Department of Community Health Sciences, University of Calgary, Alberta, Canada.
Int J Behav Nutr Phys Act. 2011 Apr 12;8:30. doi: 10.1186/1479-5868-8-30.
Children who participate in regular physical activity obtain health benefits. Preliminary pedometer-based cut-points representing sufficient levels of physical activity among youth have been established; however limited evidence regarding correlates of achieving these cut-points exists. The purpose of this study was to identify correlates of pedometer-based cut-points among elementary school-aged children.
A cross-section of children in grades 5-7 (10-12 years of age) were randomly selected from the most (n = 13) and least (n = 12) 'walkable' public elementary schools (Perth, Western Australia), stratified by socioeconomic status. Children (n = 1480; response rate = 56.6%) and parents (n = 1332; response rate = 88.8%) completed a survey, and steps were collected from children using pedometers. Pedometer data were categorized to reflect the sex-specific pedometer-based cut-points of ≥15000 steps/day for boys and ≥12000 steps/day for girls. Associations between socio-demographic characteristics, sedentary and active leisure-time behavior, independent mobility, active transportation and built environmental variables - collected from the child and parent surveys - and meeting pedometer-based cut-points were estimated (odds ratios: OR) using generalized estimating equations.
Overall 927 children participated in all components of the study and provided complete data. On average, children took 11407 ± 3136 steps/day (boys: 12270 ± 3350 vs. girls: 10681 ± 2745 steps/day; p < 0.001) and 25.9% (boys: 19.1 vs. girls: 31.6%; p < 0.001) achieved the pedometer-based cut-points.After adjusting for all other variables and school clustering, meeting the pedometer-based cut-points was negatively associated (p < 0.05) with being male (OR = 0.42), parent self-reported number of different destinations in the neighborhood (OR 0.93), and a friend's (OR 0.62) or relative's (OR 0.44, boys only) house being at least a 10-minute walk from home. Achieving the pedometer-based cut-points was positively associated with participating in screen-time < 2 hours/day (OR 1.88), not being driven to school (OR 1.48), attending a school located in a high SES neighborhood (OR 1.33), the average number of steps among children within the respondent's grade (for each 500 step/day increase: OR 1.29), and living further than a 10-minute walk from a relative's house (OR 1.69, girls only).
Comprehensive multi-level interventions that reduce screen-time, encourage active travel to/from school and foster a physically active classroom culture might encourage more physical activity among children.
经常参加体育活动的儿童会从中受益。已经确定了初步的计步器为基础的代表青少年足够身体活动水平的切点；然而，关于达到这些切点的相关性的证据有限。本研究的目的是确定小学年龄儿童计步器切点的相关性。
从最（n=13）和最不（n=12）“可步行”的公立小学（西澳大利亚州珀斯）中随机选择 5-7 年级（10-12 岁）的儿童（n=1480；响应率=56.6%）和家长（n=1332；响应率=88.8%）完成了一项调查，并使用计步器收集了儿童的步数。计步器数据被分类以反映基于计步器的男孩≥15000 步/天和女孩≥12000 步/天的切点。使用广义估计方程估计了从儿童和家长调查中收集的社会人口统计学特征、久坐和活跃的休闲时间行为、独立流动性、主动交通和建筑环境变量与达到计步器切点之间的关联（优势比：OR）。
共有 927 名儿童参加了研究的所有部分并提供了完整的数据。平均而言，儿童每天行走 11407±3136 步（男孩：12270±3350与女孩：10681±2745 步/天；p<0.001），25.9%（男孩：19.1%与女孩：31.6%；p<0.001）达到了计步器切点。在调整所有其他变量和学校聚类后，达到计步器切点与男性（OR=0.42）、家长自我报告的邻里不同目的地数量（OR0.93）以及朋友（OR0.62）或亲戚（男孩仅为 OR0.44）的家至少有 10 分钟的步行路程有关。达到计步器切点与每天观看屏幕时间<2 小时（OR1.88）、不乘车上学（OR1.48）、就读于高 SES 社区的学校（OR1.33）、受访者所在年级的儿童平均步数（每增加 500 步/天：OR1.29）以及距离亲戚家步行超过 10 分钟（OR1.69，仅限女孩）呈正相关。
减少屏幕时间、鼓励上下学主动出行并培养积极的课堂文化的综合多层次干预措施可能会鼓励儿童更多地进行身体活动。
