Eisenmann J C, Bartee R T, Smith D T, Welk G J, Fu Q
Department of Kinesiology, Michigan State University, East Lansing, MI 48823, USA.
Int J Obes (Lond). 2008 Apr;32(4):613-8. doi: 10.1038/sj.ijo.0803800. Epub 2008 Jan 22.
The purpose of this study was to examine the combined influence of physical activity (PA) and television viewing (TV) on the risk of overweight in US youth ages 14-18 years.
Cross-sectional data from a nationally representative sample of approximately 13,600 US high school students participating in the 2001 Centers for Disease Control and Prevention Youth Risk Behavior Survey (YRBS) were examined. Participants were cross-tabulated into nine PA-TV groups according to the level of moderate (MPA) or vigorous PA (VPA) (low: < or = 2 days per week; moderate: 3-5 days per week; high: 6-7 days per week) and TV (low: < or = 1 h per day; moderate: 2-3 h per day; high: > or = 4 h per day). The referent group was the low TV/high PA group. The body mass index was used to determine overweight and obesity based on the International Obesity Task Force reference values. Logistic regression was used to examine the influence of TV and PA on the odds of overweight in boys and girls, while controlling for age and ethnicity.
Boys and girls watching low levels of TV did not have increased odds of overweight regardless of PA level with the exception of girls with low TV/low VPA (odds ratio (OR)=1.48). Girls who watched moderate and high levels of TV had increased odds of overweight at any level of MPA or VPA (OR 1.24-3.11). In girls, the odds of overweight increased in a graded manner across PA levels for both the moderate and high levels of TV. Girls with high TV/low VPA had the highest odds of overweight (OR=3.11). In general, most of the associations were stronger in girls compared to boys.
The results highlight the importance of considering both PA and TV as risk factors for overweight in adolescents.
本研究旨在探讨体育活动（PA）和看电视（TV）对14 - 18岁美国青少年超重风险的综合影响。
对约13600名参与2001年疾病控制与预防中心青少年风险行为调查（YRBS）的具有全国代表性的美国高中生横断面数据进行了分析。参与者根据中度（MPA）或剧烈体育活动（VPA）水平（低：每周≤2天；中度：每周3 - 5天；高：每周6 - 7天）和看电视时间（低：每天≤1小时；中度：每天2 - 3小时；高：每天≥4小时）交叉分组为9个PA - TV组。参照组为低看电视/高体育活动组。根据国际肥胖特别工作组的参考值，使用体重指数来确定超重和肥胖情况。采用逻辑回归分析来检验看电视和体育活动对男孩和女孩超重几率的影响，同时控制年龄和种族因素。
无论体育活动水平如何，看电视少的男孩和女孩超重几率均未增加，但低看电视/低剧烈体育活动的女孩除外（优势比（OR）=1.48）。在任何中度或剧烈体育活动水平下，看电视时间为中度和高的女孩超重几率增加（OR为1.24 - 3.11）。在女孩中，对于中度和高看电视水平，超重几率随着体育活动水平的升高而呈分级增加。高看电视/低剧烈体育活动的女孩超重几率最高（OR = 3.11）。总体而言，与男孩相比，大多数关联在女孩中更强。
研究结果凸显了将体育活动和看电视均视为青少年超重风险因素的重要性。
