Center for Injury Epidemiology, Liberty Mutual Research Institute for Safety, Hopkinton, Massachusetts; Environmental and Occupational Medicine and Epidemiology Program, Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts.
Center for Injury Epidemiology, Liberty Mutual Research Institute for Safety, Hopkinton, Massachusetts; Environmental and Occupational Medicine and Epidemiology Program, Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts.
Am J Prev Med. 2015 Dec;49(6):e117-23. doi: 10.1016/j.amepre.2015.07.024. Epub 2015 Oct 1.
Technological advancements have made life and work more sedentary, and long hours of sitting are known to be associated with many health concerns. Several studies have reported an association between prolonged sitting time at work and weight gain, but the results are inconsistent. This study examined the relationship between sitting time at work and BMI using data from a large prospective cohort of U.S. men and women from 2002 to 2010. Initial analyses were performed in 2013, with additional analyses in 2014 and 2015.
The sample size at the base year (2002) was 5,285 and the age range 38-45 years. The outcome, BMI, was based on self-reported measures of height and weight. Estimates of workplace sitting time were linked from an external database (Occupational Information Network), and the occupation-wide rating for sitting time was linked to survey participants by occupation. Fixed-effects models controlling for time-invariant effects of all time-invariant characteristics were employed to examine the association, controlling for age, education, work hours, and hours of vigorous and light/moderate physical activities.
Longer sitting time was significantly associated with higher BMI for the overall sample (β = 0.054; p<0.05) and men (β = 0.086; p<0.01). For women, the association was not statistically significant.
The findings provide further support for initiatives to reduce workplace sitting time as a means of reducing the risk of weight gain and related health conditions.
技术进步使生活和工作更加久坐不动，长时间坐着与许多健康问题有关。有几项研究报告称，长时间在工作中坐着与体重增加有关，但结果不一致。本研究使用了 2002 年至 2010 年美国男女大型前瞻性队列的数据，检查了工作时坐姿时间与 BMI 之间的关系。初步分析于 2013 年进行，2014 年和 2015 年进行了额外分析。
基础年（2002 年）的样本量为 5285 人，年龄范围为 38-45 岁。结果 BMI 基于身高和体重的自我报告测量值。工作场所坐姿时间的估计值从外部数据库（职业信息网络）链接，坐姿的职业范围评分通过职业与调查参与者链接。采用固定效应模型控制所有时间不变特征的时间不变效应，以检查关联，控制年龄、教育、工作时间以及剧烈和轻/中度体育活动时间。
总体样本（β=0.054；p<0.05）和男性（β=0.086；p<0.01）中，较长的坐姿时间与较高的 BMI 显著相关。对于女性，这种关联没有统计学意义。
这些发现进一步支持减少工作场所坐姿时间的举措，作为降低体重增加和相关健康状况风险的一种手段。
