Smith Lee, Fisher Abigail, Hamer Mark
Department of Epidemiology and Public Health, Health Behaviour Research Centre, University College London, England, WC1E 6BT UK.
Department of Epidemiology and Public Health, Physical Activity Research Group, University College London, England, WC1E 6BT UK.
BMC Obes. 2015 Mar 1;2:12. doi: 10.1186/s40608-015-0042-8. eCollection 2015.
Research suggests television viewing time may be associated with incident obesity and central obesity in young adults. No study has investigated these associations in older English adults. The aim of this study was to investigate longitudinal associations between television viewing time and incident obesity and central obesity in a sample of older English adults. Analyses of data from the English Longitudinal Study of Ageing. At baseline (2008), participants reported their television viewing time. Research nurses recorded obesity and central obesity by body mass index and waist circumference, respectively, at four year follow-up. Associations between television viewing time and incident obesity (BMI > 30 kg/m(2)) and central obesity (waist >102 cm men; > 88 cm women) at four year follow-up were examined using adjusted logistic regression. Participants gave full written informed consent to participate in the study and ethical approval was obtained from the London Multicentre Research Ethics Committee.
A total of 3777 initially non-obese participants (aged 64.8 ± 8.6 yrs, 46.4% male) were included in the analyses using BMI as an outcome and 2947 for the analyses using waist circumference. No significant associations were found between television viewing time and incident obesity. A significant association was found between watching ≥6 hrs/d of television (compared to <2 hrs/d) and central obesity (Odds Ratio 1.48; 95% confidence interval 1.07 to 2.03) after adjustment for covariables including physical activity.
In this sample of older community dwelling English adults greater television viewing time was associated with incident central obesity, but not total obesity when measured by BMI. Interventions to reduce the incidence of central obesity in this age group that focus on reducing TV time, as well as targeting other health behaviours (eg, increasing physical activity levels, improving dietary intake) might prove useful.
研究表明，看电视时间可能与年轻人肥胖症及中心性肥胖的发生有关。尚无研究调查英国老年人群中的这些关联。本研究旨在调查英国老年人群样本中看电视时间与肥胖症及中心性肥胖发生之间的纵向关联。分析来自英国老龄化纵向研究的数据。在基线期（2008年），参与者报告其看电视时间。研究护士在四年随访时分别通过体重指数和腰围记录肥胖症及中心性肥胖情况。采用校正逻辑回归分析四年随访时看电视时间与肥胖症（体重指数>30 kg/m²）及中心性肥胖（男性腰围>102 cm；女性腰围>88 cm）发生之间的关联。参与者已书面签署知情同意书参与本研究，并获得伦敦多中心研究伦理委员会的伦理批准。
以体重指数作为结局指标进行分析时，共纳入3777名初始非肥胖参与者（年龄64.8±8.6岁，46.4%为男性）；以腰围作为结局指标进行分析时，共纳入2947名参与者。未发现看电视时间与肥胖症发生之间存在显著关联。在校正包括身体活动在内 的协变量后，发现每天看电视≥6小时（与<2小时相比）与中心性肥胖之间存在显著关联（比值比1.48；95%置信区间1.07至2.03）。
在这个居住在社区的英国老年人群样本中，看电视时间越长与中心性肥胖的发生有关，但以体重指数衡量时与总体肥胖无关。针对该年龄组旨在减少看电视时间以及针对其他健康行为（如增加身体活动水平、改善饮食摄入）的干预措施可能会被证明是有用的。
