Wickel Eric E, Eisenmann Joey C
Exercise and Sport Science, University of Tulsa, Tulsa, OK 74104, USA.
Med Sci Sports Exerc. 2007 Sep;39(9):1493-500. doi: 10.1249/mss.0b013e318093f56a.
The purpose of this study was twofold: 1) to determine the contribution of organized youth sport to total daily physical activity (PA), and 2) to examine the contribution of daily recess and physical education (PE) to total daily PA.
Using a cross-sectional design, 119 children wore an accelerometer during a school day in which they participated in organized youth sport. A subsample (N=36) wore the accelerometer on a nonsport day to examine day-to-day differences in PA. Total daily PA and PA during youth sport, recess, and PE were estimated. The contributions of youth sport, recess, and PE were determined by dividing the amount of PA from each activity by the total daily amount of PA.
Approximately 110 min of moderate to vigorous physical activity (MVPA) were achieved on the monitoring day. Youth sport contributed approximately 23% of the total MVPA, whereas PE and recess contributed almost 11 and 16%, respectively. Nearly half of the accumulated minutes of MVPA were attributed to unstructured activities (approximately 56 min). For the entire sample, approximately 52% of youth sport time was spent in either sedentary or light-intensity activities, whereas moderate and vigorous physical activity accounted for approximately 27 and 22% of the time, respectively. During a nonsport day, participants engaged in significantly more sedentary activity (P=0.02) and significantly less moderate (P=0.02) and vigorous activity (P<0.001) compared with the sport day.
Participants in this study averaged 110 min of MVPA during a day in which they participated in youth sport. The additional amount of MVPA accumulated on the sport day (approximately 30 min) was not maintained on a nonsport day.
本研究有两个目的：1）确定有组织的青少年体育活动对每日总身体活动（PA）的贡献；2）研究每日课间休息和体育教育（PE）对每日总PA的贡献。
采用横断面设计，119名儿童在参加有组织的青少年体育活动的学校日佩戴加速度计。一个子样本（N = 36）在非体育日佩戴加速度计，以检查PA的日常差异。估计每日总PA以及青少年体育活动、课间休息和体育教育期间的PA。通过将每项活动的PA量除以每日总PA量来确定青少年体育活动、课间休息和体育教育的贡献。
在监测日，大约实现了110分钟的中度至剧烈身体活动（MVPA）。青少年体育活动对总MVPA的贡献约为23%，而体育教育和课间休息分别贡献了近11%和16%。近一半的MVPA累计分钟数归因于非结构化活动（约56分钟）。对于整个样本，青少年体育活动时间的约52%用于久坐或轻度强度活动，而中度和剧烈身体活动分别占时间的约27%和22%。在非体育日，与体育日相比，参与者进行的久坐活动显著更多（P = 0.02），中度（P = 0.02）和剧烈活动显著更少（P < 0.001）。
本研究中的参与者在参加青少年体育活动的一天中平均有110分钟的MVPA。体育日积累的额外MVPA量（约30分钟）在非体育日并未保持。
