Feldman Debbie Ehrmann, Barnett Tracie, Shrier Ian, Rossignol Michel, Abenhaim Lucien
Groupe de recherche interdisciplinaire en santé, Ecole de Réadaptation, Université de Montréal, Montréal, Québec, Canada.
Arch Pediatr Adolesc Med. 2003 Aug;157(8):797-802. doi: 10.1001/archpedi.157.8.797.
To determine whether there is a relationship between the time adolescents spend in physical activity and time they spend in different sedentary pursuits: watching television, playing video games, working on computers, doing homework, and reading, taking into account the effect of part-time work on students' residual time.
Cross-sectional cohort design.
Seven hundred forty-three high school students from 2 inner-city public schools and 1 private school.
Students completed a self-administered questionnaire that addressed time spent in physical activity, time spent in sedentary pursuits, musculoskeletal pain, and psychosocial issues and were also measured for height and weight. Main Outcome Measure Level of physical activity (low, moderate, high).
There were more girls than boys in the low and moderate physical activity groups and more boys than girls in the high activity group. Ordinal logistic regression showed that increased time spent in "productive sedentary behavior" (reading or doing homework and working on computers) was associated with increased physical activity (odds ratio, 1.7; 95% confidence interval, 1.2-2.4), as was time spent working (odds ratio, 1.3; 95% confidence interval, 1.2-1.4). Time spent watching television and playing video games was not associated with decreased physical activity.
Physical activity was not inversely associated with watching television or playing video games, but was positively associated with productive sedentary behavior and part-time work. Some students appear capable of managing their time better than others. Future studies should explore the ability of students to manage their time and also determine what characteristics are conducive to better time management.
考虑兼职工作对学生剩余时间的影响，确定青少年进行体育活动的时间与他们花在不同久坐活动（看电视、玩电子游戏、使用电脑、做家庭作业和阅读）上的时间之间是否存在关联。
横断面队列研究设计。
来自两所市中心公立学校和一所私立学校的743名高中生。
学生完成一份自填式问卷，问卷涉及体育活动时间、久坐活动时间、肌肉骨骼疼痛和心理社会问题，同时还测量了身高和体重。主要观察指标：体育活动水平（低、中、高）。
低强度和中等强度体育活动组中女生多于男生，高强度活动组中男生多于女生。有序逻辑回归显示，花在“有益的久坐行为”（阅读、做家庭作业和使用电脑）上的时间增加与体育活动增加相关（优势比为1.7；95%置信区间为1.2 - 2.4），工作时间增加也与之相关（优势比为1.3；95%置信区间为1.2 - 1.4）。花在看电视和玩电子游戏上的时间与体育活动减少无关。
体育活动与看电视或玩电子游戏不存在负相关，但与有益的久坐行为和兼职工作呈正相关。一些学生似乎比其他学生更能有效地管理时间。未来的研究应探索学生管理时间的能力，并确定哪些特征有助于更好地管理时间。
