Diaz Keith M, Howard Virginia J, Hutto Brent, Colabianchi Natalie, Vena John E, Blair Steven N, Hooker Steven P
1Center for Behavioral Cardiovascular Health, Department of Medicine, Columbia University Medical Center, New York, NY; 2Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, AL; 3Prevention Research Center, Arnold School of Public Health, University of South Carolina, Columbia, SC; 4Institute for Social Research and School of Kinesiology, University of Michigan, Ann Arbor, MI; 5Department of Public Health Sciences, Medical University of South Carolina, Charleston, SC; 6Departments of Exercise Science and Epidemiology and Biostatistics, Arnold School of Public Health, University of South Carolina, Columbia, SC; and 7School of Nutrition and Health Promotion, Arizona State University, Phoenix, AZ.
Med Sci Sports Exerc. 2016 Mar;48(3):430-8. doi: 10.1249/MSS.0000000000000792.
The purposes of this study were to examine patterns of objectively measured sedentary behavior in a national cohort of US middle-age and older adults and to determine factors that influence prolonged sedentary behavior.
We studied 8096 participants from the REasons for Geographic and Racial Differences in Stroke (REGARDS) Study, a population-based study of black and white adults 45 yr or older. Seven-day accelerometry was conducted. Prolonged sedentary behavior was defined as accumulating 50% or more of total sedentary time in bouts of 30 min or greater.
The number of sedentary bouts greater than or equal to 20, 30, 60, and 90 min were 8.8 ± 2.3, 5.5 ± 1.9, 1.9 ± 1.1, and 0.8 ± 0.7 bouts per day, respectively. Sedentary bouts greater than or equal to 20, 30, 60, and 90 min accounted for 60.0% ± 13.9%, 48.0% ± 15.5%, 26.0% ± 15.4%, and 14.2% ± 12.9% of total sedentary time, respectively. Several factors were associated with prolonged sedentary behavior in multivariate-adjusted models (odds ratio [95% confidence interval]): older age (65-74 yr: 1.99 [1.55-2.57]; 75 yr or older: 4.68 [3.61-6.07] vs 45-54 yr), male sex (1.41 [1.28-1.56] vs female), residence in nonstroke belt/buckle region of the United States (stroke belt: 0.87 [0.77-0.98]; stroke buckle: 0.86 [0.77-0.95] vs non-belt/buckle), body mass index (BMI) (overweight: 1.33 [1.18-1.51]; obese: 2.15 [1.89-2.44] vs normal weight), winter (1.18 [1.03-1.35] vs summer), and low amounts of moderate-to-vigorous physical activity (MVPA) [0 min·wk: 2.00 [1.66-2.40] vs ≥150 min·wk).
In this sample of US middle-age and older adults, a large proportion of total sedentary time was accumulated in prolonged, uninterrupted bouts of sedentary behavior as almost one-half was accumulated in sedentary bouts greater than or equal to 30 min. Several sociodemographic (age, sex, and BMI), behavioral (MVPA), environmental (region), and seasonal factors are associated with patterns of prolonged sedentary behavior.
本研究的目的是调查美国中老年人群队列中客观测量的久坐行为模式，并确定影响久坐行为延长的因素。
我们对来自“中风地理和种族差异原因”（REGARDS）研究的8096名参与者进行了研究，该研究是一项针对45岁及以上黑人和白人成年人的基于人群的研究。进行了为期7天的加速度计测量。久坐行为延长被定义为在30分钟或更长时间的时间段内累积久坐总时间的50%或更多。
每天久坐时间大于或等于20、30、60和90分钟的次数分别为8.8±2.3、5.5±1.9、1.9±1.1和0.8±0.7次。久坐时间大于或等于20、30、60和90分钟分别占久坐总时间的60.0%±13.9%、48.0%±15.5%、26.0%±15.4%和14.2%±12.9%。在多变量调整模型中，几个因素与久坐行为延长有关（优势比[95%置信区间]）：年龄较大（65 - 74岁：1.99[1.55 - 2.57]；75岁及以上：4.68[3.61 - 6.07]对比45 - 54岁）、男性（1.41[1.28 - 1.56]对比女性）、居住在美国非中风带/扣区（中风带：0.87[0.77 - 0.98]；中风扣区：0.86[0.77 - 0.95]对比非带/扣区）、体重指数（BMI）（超重：1.33[1.18 - 1.51]；肥胖：2.15[1.89 - 2.44]对比正常体重）、冬季（1.18[1.03 - 1.35]对比夏季）以及中等到剧烈身体活动（MVPA）量低（0分钟·周：2.00[1.66 - 2.40]对比≥150分钟·周）。
在这个美国中老年人群样本中，很大一部分久坐总时间是在长时间、不间断的久坐行为中累积的，因为几乎一半是在大于或等于30分钟的久坐时间段内累积的。几个社会人口统计学（年龄、性别和BMI）、行为（MVPA）、环境（地区）和季节因素与久坐行为延长模式有关。
