Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México.
Salud Publica Mex. 2011 May-Jun;53(3):228-36.
To compare the physical activity patterns of a cohort of Mexican children in kindergarten (K), first (1ES) and second grade (2ES) of elementary school.
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.
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).
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.
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。
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。
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）。
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。
