Matthews-Ewald Molly R, Moore Lucas C, Harris Carole V, Bradlyn Andrew S, Frost Stephanie S
West Virginia University Health Research Center, PO Box 9190, Morgantown, WV 25608, USA.
W V Med J. 2013 Jul-Aug;109(4):12-6.
Physical education (PE) provides a natural opportunity for students to be physically active during the school day; however, the amount and intensity of this activity varies. The Centers for Disease Control and Prevention recommends that students engage in MVPA for at least 50% of their PE class period. The purpose of the present study was to quantify the amount of MVPA that occurs during elementary school PE.
Accelerometer data were collected from 203 students (100 2nd grade; 103 5th grade) in 10 West Virginia elementary schools. At each school, PE teachers identified three 2nd grade classes and three 5th grade classes in which to collect the physical activity data. For each selected class, the teachers identified the first 4 students on their alphabetic roll to wear the accelerometers. PE teachers recorded the date and time of the class and the gender of the students wearing the accelerometers.
Using 5-second epochs and Puyau's cut-offs, results indicated that, on average, students engaged in MVPA for 27% of their PE class. No significant differences were observed in MVPA between 2nd and 5th grade students or between males and females. Male and female students spent equal amounts of PE class in MVPA.
Findings support policy to increase the required minimum amount of MVPA during each PE class.
体育教育（PE）为学生在学校日进行体育活动提供了自然的机会；然而，这种活动的量和强度各不相同。疾病控制与预防中心建议学生在体育课期间至少50%的时间参与中等至剧烈身体活动（MVPA）。本研究的目的是量化小学体育课期间发生的MVPA量。
从西弗吉尼亚州10所小学的203名学生（100名二年级学生；103名五年级学生）中收集加速度计数据。在每所学校，体育教师确定三个二年级班级和三个五年级班级来收集身体活动数据。对于每个选定的班级，教师从字母顺序名单中确定前4名学生佩戴加速度计。体育教师记录上课日期和时间以及佩戴加速度计的学生性别。
使用5秒时间段和普约的临界值，结果表明，平均而言，学生在体育课期间有27%的时间参与MVPA。二年级和五年级学生之间或男性和女性之间在MVPA方面未观察到显著差异。男女生在MVPA中花费的体育课时间相等。
研究结果支持增加每节体育课所需最低MVPA量的政策。
