Beets Michael W, Weaver Robert Glenn, Turner-McGrievy Gabrielle, Moore Justin B, Webster Collin, Brazendale Keith, Chandler Jessica, Khan Mahmud, Saunders Ruth, Beighle Aaron
1 Arnold School of Public Health, University of South Carolina , Columbia, SC.
2 Department of Family and Community Medicine, Wake Forest School of Medicine, Winston-Salem, NC.
Child Obes. 2016 Aug;12(4):237-46. doi: 10.1089/chi.2015.0223. Epub 2016 Apr 20.
In 2011, the YMCA of the United States adopted physical activity standards for all their afterschool programs (ASPs), which call for children to accumulate 30 minutes of moderate-to-vigorous physical activity (MVPA) while attending YMCA ASPs. The extent to which youth attending YMCA ASPs achieve this standard is unknown.
Using a cluster-stratified design, 20 ASPs were sampled from all YMCA-operated ASPs across South Carolina (N = 102). ASPs were visited on four unannounced, nonconsecutive weekdays. Accelerometer-derived minutes spent in MVPA were dichotomized to ≥30 min/d of MVPA and <30 min/d of MVPA. Program characteristics were measured through document review and direct observation and compared to MVPA levels using random-effects quantile regression.
Boys (n = 607) and girls (n = 475) accumulated a median of 25.3 and 17.1 min/d of MVPA, respectively, which translated into 33% (range 6.2%-67.3%) and 17% (0%-42.6%) achieving the 30 min/d of MVPA standard, respectively. Increase in time scheduled for activity (10.7-11.7 min/d of MVPA), limited sedentary choices during activity time (6.9-8.9 min/d of MVPA), and staff activity-promotion training (4.8-7.9 min/d of MVPA) were associated with higher accumulated minutes of MVPA for boys and girls. Program revenue, percent activity structure that was for free play, and indoor/outdoor space were inconsistently related to meeting the MVPA standard.
Modifiable programmatic structures were associated with higher amounts of MVPA. These findings suggest that simple programmatic changes could help ASPs to achieve the MVPA standard, regardless of infrastructure or finances.
2011年，美国基督教青年会（YMCA）为其所有课外项目（ASP）制定了身体活动标准，要求儿童在参加基督教青年会课外项目时累计进行30分钟的中等至剧烈身体活动（MVPA）。参加基督教青年会课外项目的青少年达到该标准的程度尚不清楚。
采用整群分层设计，从南卡罗来纳州所有由基督教青年会运营的课外项目中抽取20个项目（N = 102）。在四个未宣布的、不连续的工作日对课外项目进行走访。将通过加速度计得出的中等至剧烈身体活动时间分为每天≥30分钟的中等至剧烈身体活动和每天<30分钟的中等至剧烈身体活动。通过文件审查和直接观察来衡量项目特征，并使用随机效应分位数回归将其与中等至剧烈身体活动水平进行比较。
男孩（n = 607）和女孩（n = 475）每天中等至剧烈身体活动的中位数分别为25.3分钟和17.1分钟，分别相当于33%（范围6.2%-67.3%）和17%（0%-42.6%）达到了每天30分钟的中等至剧烈身体活动标准。活动安排时间的增加（每天中等至剧烈身体活动增加10.7 - 11.7分钟）、活动时间内有限的久坐选择（每天中等至剧烈身体活动增加6.9 - 8.9分钟）以及工作人员的活动促进培训（每天中等至剧烈身体活动增加4.8 - 7.9分钟）与男孩和女孩中等至剧烈身体活动累计时间的增加有关。项目收入、自由玩耍的活动结构百分比以及室内/室外空间与达到中等至剧烈身体活动标准的关系并不一致。
可改变的项目结构与更多的中等至剧烈身体活动量相关。这些发现表明，无论基础设施或资金状况如何，简单的项目改变都有助于课外项目达到中等至剧烈身体活动标准。
