J Phys Act Health. 2019 Mar 1;16(3):177-183. doi: 10.1123/jpah.2017-0587. Epub 2019 Jan 29.
To analyze the longitudinal association between academic performance and moderate to vigorous physical activity (MVPA), vigorous physical activity (VPA), and sedentary (SED) in a 3-year longitudinal study. A secondary aim was to determine whether MVPA and VPA were indirectly related with academic performance via waist circumference (WC).
Physical activity (PA) and SED were measured by accelerometers. Academic performance was assessed by national tests in Danish and Math. Structural equation modeling was performed to evaluate whether MVPA, VPA, and SED were associated with academic performance and the potential PA-academic performance indirect relationship via WC.
MVPA and VPA were associated with academic performance, mediated via WC (β = 0.036; 95% confidence interval [CI], 0.002 to 0.070 and β = 0.096; 95% CI, 0.027 to 0.164, respectively). SED was directly associated with academic performance (β = 0.124; 95% CI, 0.030 to 0.217, MVPA model and β = 0.132; 95% CI, 0.044 to 0.221, VPA model). WC was negatively associated with academic performance.
Both PA and SED time were positively associated with academic performance. Based on this, PA should be encouraged in children and youth not only to promote physical health but also to promote academic performance. Future studies should distinguish between school-related SED and other SED activities and their relationship with academic performance.
在一项为期 3 年的纵向研究中，分析学业成绩与中等到剧烈体力活动（MVPA）、剧烈体力活动（VPA）和久坐（SED）之间的纵向关联。次要目的是确定 MVPA 和 VPA 是否通过腰围（WC）与学业成绩间接相关。
通过加速度计测量体力活动（PA）和 SED。学术成绩通过丹麦和数学的全国性考试进行评估。结构方程模型用于评估 MVPA、VPA 和 SED 是否与学业成绩相关，以及 PA-学业成绩通过 WC 的潜在间接关系。
MVPA 和 VPA 与学业成绩相关，通过 WC 介导（β=0.036；95%置信区间 [CI]，0.002 至 0.070 和 β=0.096；95%CI，0.027 至 0.164，分别）。SED 与学业成绩直接相关（β=0.124；95%CI，0.030 至 0.217，MVPA 模型和 β=0.132；95%CI，0.044 至 0.221，VPA 模型）。WC 与学业成绩呈负相关。
PA 和 SED 时间都与学业成绩呈正相关。基于此，应鼓励儿童和青少年进行 PA，不仅促进身体健康，还促进学业成绩。未来的研究应区分与学校相关的 SED 和其他 SED 活动及其与学业成绩的关系。
