Department of Kinesiology and Community Health, University of Illinois at Urbana-Champaign, Urbana, IL.
Division of Nutritional Sciences, University of Illinois at Urbana-Champaign, Urbana, IL.
J Nutr Educ Behav. 2019 May;51(5):616-622. doi: 10.1016/j.jneb.2019.01.006. Epub 2019 Feb 12.
To examine the relationship between school lunch timing (before vs after recess) on physical activity (PA) during recess and energy balance and food intake at lunch.
A cross-sectional study design was used to examine lunch intake and PA during recess among fourth- and fifth-graders (n = 103) over 5 school days. Lunch and PA were measured using a weighted plate waste technique and accelerometry, respectively.
Children who received lunch before recess accumulated lower residual energy (ie, energy intake at lunch minus energy expenditure during recess) and consumed a greater proportion of milk servings. No timing effects were observed for other lunch and PA variables.
Lunch intake and activity during recess are related to lunch timing policy. Findings warrant further examination using experimental and quasi-experimental studies to better understand the impact of timing on health behaviors.
研究课间休息时的午餐时间（休息前与休息后）对课间休息时身体活动（PA）和午餐时能量平衡及食物摄入的影响。
采用横断面研究设计，在 5 天的时间里，对 103 名四五年级学生进行午餐摄入和课间休息时 PA 的检测，分别使用称重盘废物技术和加速度计。
与课间休息后吃午餐的孩子相比，课间休息前吃午餐的孩子剩余能量（即午餐摄入的能量减去课间休息时的能量消耗）较低，且牛奶的摄入量较大。对于其他午餐和 PA 变量，未观察到时间效应。
课间休息时的午餐摄入和活动与午餐时间安排政策有关。这些发现需要进一步通过实验和准实验研究进行检验，以更好地了解时间安排对健康行为的影响。
