墨西哥儿童进入小学后，其身体活动水平下降。
The physical activity level of Mexican children decreases upon entry to elementary school.
机构信息
Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México.
出版信息
Salud Publica Mex. 2011 May-Jun;53(3):228-36.
OBJECTIVE
To compare the physical activity patterns of a cohort of Mexican children in kindergarten (K), first (1ES) and second grade (2ES) of elementary school.
MATERIAL AND METHODS
The physical activity of 217 children (123 girls and 94 boys) aged 5-6 years was measured (five full-day triaxial accelerometry) annually.Weekday and weekend moderate/ vigorous physical activity (MVPA) and school and off-school MVPA was calculated. Comparisons between surveys were made using longitudinal multilevel generalized linear models.
RESULTS
Weekday MVPA was 22 and 37 min/d lower for 1ES (p=0.06) and 2ES (p<0.01), respectively, compared to K. School MVPA for 1ES and 2ES was 37 (-5.0 min/h) and 40% (-5.5 min/h) (p<0.001) lower, respectively, compared to K. No differences were found between weekend and off-school MVPA among school stages (p>0.5).
CONCLUSION
MVPA was significantly reduced from K to ES,in part because of a decline in MVPA during school activities. Interventions targeted to school environment modifications should be promoted.
目的
比较幼儿园（K）、一年级（1ES）和二年级（2ES）的墨西哥儿童队列的体力活动模式。
材料和方法
对 217 名 5-6 岁儿童（123 名女孩和 94 名男孩）的体力活动进行了测量（5 天三轴加速度计），每年一次。计算了工作日和周末的中高强度体力活动（MVPA）和校内和校外 MVPA。使用纵向多级广义线性模型对调查结果进行了比较。
结果
与 K 相比，1ES（p=0.06）和 2ES（p<0.01）的工作日 MVPA 分别低 22 和 37 分钟/天。与 K 相比，1ES 和 2ES 的校内 MVPA 分别低 37（-5.0 分钟/小时）和 40%（-5.5 分钟/小时）（p<0.001）。在校阶段，周末和校外 MVPA 之间无差异（p>0.5）。
结论
MVPA 从幼儿园到小学阶段显著下降，部分原因是校内活动期间 MVPA 下降。应促进针对学校环境改变的干预措施。
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