Herman Katya M, Paradis Gilles, Mathieu Marie-Eve, O'Loughlin Jennifer, Tremblay Angelo, Lambert Marie
Dept. of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Quebec.
Pediatr Exerc Sci. 2014 Feb;26(1):76-85. doi: 10.1123/pes.2012-0128. Epub 2013 Aug 29.
This study examines the association between objectively-measured physical activity (PA) intensities and sedentary behavior (SED) in a cohort of 532 children aged 8-10 y. PA and SED were assessed by accelerometer over 7-days. Television and computer/video-game use were self-reported. Associations between PA intensities and SED variables were assessed by Spearman correlations and adjusted multiple linear regression. Higher mean daily moderate-to-vigorous and vigorous PA (MVPA, VPA) were negatively associated with mean daily SED (r = -0.47 and -0.37; p < .001), and positively associated with mean daily total PA (r = .58 and 0.46; p < .001). MVPA was also positively associated with light PA (LPA; r = .26, p < .001). MVPA and VPA were not significantly associated with TV, computer/video or total screen time; accelerometer SED was only weakly associated with specific SED behaviors. On average, for each additional 10 min daily MVPA, children accumulated >14 min less SED, and for each additional 5 min VPA, 11 min less SED. Thus, over the course of a week, higher mean daily MVPA may displace SED time and is associated with higher total PA over and above the additional MVPA, due to concomitant higher levels of LPA. Public health strategies should target both MVPA and SED to improve overall PA and health in children.
本研究调查了532名8至10岁儿童队列中客观测量的身体活动（PA）强度与久坐行为（SED）之间的关联。通过加速度计对PA和SED进行了为期7天的评估。电视及电脑/电子游戏使用情况通过自我报告获取。通过Spearman相关性分析及调整后的多元线性回归评估PA强度与SED变量之间的关联。每日平均中度至剧烈身体活动（MVPA）及剧烈身体活动（VPA）与每日平均SED呈负相关（r = -0.47和-0.37；p < 0.001），与每日平均总PA呈正相关（r = .58和0.46；p < 0.001）。MVPA与轻度身体活动（LPA）也呈正相关（r = .26，p < 0.001）。MVPA和VPA与看电视、使用电脑/电子游戏或总屏幕时间无显著关联；加速度计测量的SED仅与特定的SED行为存在微弱关联。平均而言，每日MVPA每增加10分钟，儿童的SED时间减少超过14分钟，VPA每增加5分钟，SED时间减少11分钟。因此，在一周的时间里，较高的每日平均MVPA可能会取代SED时间，并且由于伴随更高水平的LPA，与额外的MVPA之上的更高总PA相关。公共卫生策略应同时针对MVPA和SED，以改善儿童的总体PA水平和健康状况。
