Simons-Morton B G, Taylor W C, Snider S A, Huang I W
University of Texas Health Science Center, Houston.
Am J Public Health. 1993 Feb;83(2):262-4. doi: 10.2105/ajph.83.2.262.
One hundred fifty-seven fifth-grade students in 20 of the 355 elementary schools in one Texas county were systematically observed during physical education classes. On average, the students spent 8.5% of class time in moderate to vigorous physical activity, 23.3% in minimal activity, and 68.1% in sedentary activity. None of the schools averaged 20% of class time in moderate to vigorous physical activity. The levels of physical activity observed are substantially lower than the levels called for in national health objectives.
在得克萨斯州一个县的355所小学中的20所学校，对157名五年级学生在体育课期间进行了系统观察。平均而言，学生在中等至剧烈体育活动中花费的课堂时间为8.5%，在极少活动中花费23.3%，在久坐活动中花费68.1%。没有一所学校中等至剧烈体育活动的平均课堂时间达到20%。观察到的体育活动水平大大低于国家健康目标所要求的水平。
