The University of Texas Health Science Center at Houston, School of Public Health, Austin Regional Campus, 1616 Guadalupe St, Ste 6.300, Austin, TX 78701, USA.
Prev Chronic Dis. 2011 May;8(3):A61. Epub 2011 Apr 15.
The epidemic of childhood obesity has been well-documented. Prevalence of obesity among students in Texas is higher than the US prevalence. Our objective was to understand the combined influence of physical activity and television viewing on weight status of students in Texas.
Students in grades 4, 8, and 11 participated in the School Physical Activity and Nutrition survey during the 2004-2005 academic year. Multinomial logistic regression tested the associations between both being overweight and obese (vs underweight/normal weight) and the combined influence of physical activity and watching television, adjusting for age, grade, race/ethnicity, language spoken at home, and percentage of economically disadvantaged students in the school. We used 5 physical activity indicators to describe students' physical activity.
Girls who participated in less than 3 days of exercise per week to strengthen or tone muscles and watched 2 hours or less per day of television had increased odds of being obese (adjusted odds ratio, 1.8; 95% confidence interval, 1.1-3.0) compared with girls who participated in 3 or more days per week of exercise to strengthen or tone muscles and watched 2 hours or less per day of television. Boys in our study who watched 3 or more hours per day of television and did not meet physical activity recommendations had increased odds of being obese in all of our 5 physical activity indicators.
Although results varied by physical activity indicator and sex, our findings provide further evidence for the combined effect of high television watching and low physical activity engagement on the risk for obesity in children and adolescents.
儿童肥胖症的流行已得到充分证实。得克萨斯州学生的肥胖患病率高于美国的肥胖患病率。我们的目的是了解体力活动和看电视对得克萨斯州学生体重状况的综合影响。
在 2004-2005 学年期间，参加了四年级、八年级和十一年级的学校体育活动和营养调查。多变量逻辑回归测试了超重和肥胖（与体重不足/正常体重相比）与体力活动和看电视的综合影响之间的关联，同时调整了年龄、年级、种族/族裔、在家中说的语言以及学校中经济困难学生的比例。我们使用了 5 个体力活动指标来描述学生的体力活动。
与每周至少参加 3 天的锻炼来增强或塑造肌肉且每天看电视不超过 2 小时的女孩相比，每周锻炼少于 3 天且每天看电视 2 小时或更少的女孩肥胖的几率更高（调整后的优势比，1.8；95%置信区间，1.1-3.0）。在我们的研究中，每天看电视 3 小时或以上且不符合体力活动建议的男孩，在我们所有 5 项体力活动指标中，肥胖的几率均有所增加。
尽管结果因体力活动指标和性别而异，但我们的研究结果为高电视观看和低体力活动参与对儿童和青少年肥胖风险的综合影响提供了进一步的证据。
