Jennings-Aburto Nancy, Nava Fernanda, Bonvecchio Anabelle, Safdie Margarita, González-Casanova Inés, Gust Tiffany, Rivera Juan
Instituto Nacional de Salud Pública, Centro de Investigación en Nutrición y Salud, Cuernavaca, México.
Salud Publica Mex. 2009 Mar-Apr;51(2):141-7. doi: 10.1590/s0036-36342009000200010.
To quantify the physical activity (PA) of students and describe the school environment surrounding PA.
Between November 2005 and March 2006, in Mexico City, we conducted quantitative and qualitative observations to describe the PA and the school context.
Recess and physical education class (PE) were the only opportunities to participate in PA. PE occurred one time per week with a duration of 39.8+/-10.6 minutes which is less than national and international recommendations. Students participated in moderate-to-vigorous PA 29.2+/-17.8% of PE. The dynamics of PE did not promote the inclusion of all students or PA. During recess there was overcrowding of the school patio and no equipment for PA or organization of PA.
The PA of students in public schools in Mexico City can be improved by increasing the quantity and quality of PE and increasing opportunities for activity during recess.
量化学生的身体活动（PA），并描述围绕身体活动的学校环境。
2005年11月至2006年3月期间，在墨西哥城，我们进行了定量和定性观察，以描述身体活动和学校环境。
课间休息和体育课是参与身体活动的唯一机会。体育课每周进行一次，时长为39.8±10.6分钟，低于国家和国际建议。学生在体育课中参与中度至剧烈身体活动的时间占体育课时间的29.2±17.8%。体育课的活动安排并未促进所有学生的参与或身体活动。课间休息时，学校操场过度拥挤，没有用于身体活动的设备，也没有组织身体活动。
通过增加体育课的数量和质量以及增加课间休息时的活动机会，可以改善墨西哥城公立学校学生的身体活动情况。
