Utter Jennifer, Neumark-Sztainer Dianne, Jeffery Robert, Story Mary
Division of Epidemiology, School of Public Health, University of Minnesota, Minneapolis, MN 55454, USA.
J Am Diet Assoc. 2003 Oct;103(10):1298-305. doi: 10.1016/s0002-8223(03)01079-4.
To describe the demographic characteristics of adolescent boys and girls who engage in three sedentary behaviors (television/video use, computer use, and reading/homework), and to explore how each sedentary activity is associated with body mass index (BMI), dietary behaviors, and leisure time physical activity.
This study draws on data collected from Project EAT (Eating Among Teens), a school-based survey examining personal, behavioral, and socioenvironmental factors that are associated with nutritional intake among adolescents.
The study sample consists of 4746 middle and high school students from 31 public schools in a metropolitan area of the upper Midwest. All students were invited to participate. The overall response rate for Project EAT was 81.5%. Data collection was completed during the 1998-1999 school year.
Multivariate linear regression was used for examining associations between independent and dependent variables, controlling for age, race/ethnicity, and socioeconomic status. All differences were considered statistically significant at P<.05.
Among boys, television/video use and time spent reading/doing homework were positively associated with BMI (P<.05), whereas for girls television/video and computer use were positively associated with BMI (P<.05). High television/video use among boys and girls was associated with more unhealthful dietary behaviors (eg, increased consumption of soft drinks, fried foods, and snacks) (P<.05). In contrast, time spent reading/doing homework was associated with more healthful dietary behaviors (eg, increased consumption of fruits and vegetables) (P<.05). Leisure time physical activity was not associated with television/video use among boys or girls, but was positively associated with computer use and time spent reading/doing homework (P<.05). Applications/Conclusions Messages and advice aimed at reducing time spent in sedentary activities should be targeted at television/video use instead of time spent reading, doing homework, or using a computer. Nutrition education should incorporate messages about the influence of the media and advertising on dietary behaviors.
描述从事三种久坐行为（看电视/录像、使用电脑、阅读/做作业）的青少年男孩和女孩的人口统计学特征，并探讨每种久坐活动与体重指数（BMI）、饮食行为和休闲时间体力活动之间的关联。
本研究利用从“青少年饮食”（EAT）项目收集的数据，这是一项基于学校的调查，研究与青少年营养摄入相关的个人、行为和社会环境因素。
研究样本包括来自中西部上半区一个大都市地区31所公立学校的4746名初中和高中学生。邀请了所有学生参与。“青少年饮食”项目的总体回复率为81.5%。数据收集于1998 - 1999学年完成。
采用多元线性回归分析自变量和因变量之间的关联，并控制年龄、种族/民族和社会经济地位。所有差异在P<0.05时被认为具有统计学意义。
在男孩中，看电视/录像和阅读/做作业的时间与BMI呈正相关（P<0.05），而在女孩中，看电视/录像和使用电脑与BMI呈正相关（P<0.05）。男孩和女孩中看电视/录像时间较长与更不健康的饮食行为相关（如软饮料、油炸食品和零食的摄入量增加）（P<0.05）。相比之下，阅读/做作业的时间与更健康的饮食行为相关（如水果和蔬菜的摄入量增加）（P<0.05）。休闲时间体力活动与男孩或女孩看电视/录像的时间无关，但与使用电脑和阅读/做作业的时间呈正相关（P<0.05）。应用/结论：旨在减少久坐活动时间的信息和建议应针对看电视/录像的时间，而不是阅读、做作业或使用电脑的时间。营养教育应纳入有关媒体和广告对饮食行为影响的信息。
