Department of Epidemiology, Human Genetics, and Environmental Sciences and Michael & Susan Dell Center for Healthy Living, UTHealth School of Public Health, Austin Campus, Austin, Texas.
Dell Medical School, Department of Women's Health, The University of Texas at Austin, Austin, Texas.
Am J Epidemiol. 2018 Oct 1;187(10):2145-2150. doi: 10.1093/aje/kwy117.
We describe 10-year changes in accelerometer-determined physical activity (PA) and sedentary time in a midlife cohort of the Coronary Artery Risk Development in Young Adults Study, within and by race and sex groups. Participants (n = 962) wore the accelerometer with valid wear (≥4 of 7 days, ≥10 hours per day) at baseline (2005-2006; ages 38-50 years) and 10-year follow-up (2015-2016; ages 48-60 years). Data were calibrated to account for accelerometer model differences. Participants (mean age = 45.0 (standard deviation, 3.5) years at baseline) had reduced accelerometer counts overall (mean = -65.5 (standard error (SE), 10.2) counts per minute/day), and within race and sex groups (all P < 0.001). Sedentary time increased overall (mean = 37.9 (SE, 3.7) minutes/day) and within race and sex groups, whereas light-intensity PA (mean = -30.6 (SE, 2.7) minutes/day) and moderate- to vigorous-intensity PA (mean = -7.5 (SE, 0.8) minutes/day) declined overall and within race and sex groups (all P < 0.001). Significant differences in 10-year change estimates were noted by race and sex groups for accelerometer counts, sedentary time, and moderate- to vigorous-intensity PA bouts; black men had the greatest reductions in PA compared with other groups. PA declines during midlife were characterized by reductions in light-intensity PA with increases in sedentary time, which may have important health consequences. Targeted efforts are needed to preserve PA, regardless of intensity level, across midlife.
我们描述了中年冠状动脉风险发展研究中一个队列的 10 年变化，包括不同种族和性别的参与者的加速度计确定的体力活动 (PA) 和久坐时间。参与者 (n = 962) 在基线 (2005-2006 年；年龄 38-50 岁) 和 10 年随访 (2015-2016 年；年龄 48-60 岁) 期间佩戴了经过验证的加速度计 (≥4 天/周，每天≥10 小时)。数据经过校准以考虑加速度计模型的差异。参与者 (基线时平均年龄 = 45.0(标准差，3.5)岁) 的加速度计计数总体减少 (平均 = -65.5(标准误差 (SE)，10.2)计数/分钟/天)，并且在不同种族和性别群体中也是如此 (所有 P < 0.001)。总体上久坐时间增加 (平均 = 37.9(SE，3.7)分钟/天)，并且在不同种族和性别群体中也是如此，而低强度 PA (平均 = -30.6(SE，2.7)分钟/天)和中高强度 PA (平均 = -7.5(SE，0.8)分钟/天) 总体上和在不同种族和性别群体中均下降 (所有 P < 0.001)。按种族和性别群体划分，加速度计计数、久坐时间和中高强度 PA 爆发的 10 年变化估计值存在显著差异；与其他群体相比，黑人男性的 PA 减少最多。中年期间 PA 的下降表现为低强度 PA 的减少，同时久坐时间增加，这可能会产生重要的健康后果。无论强度水平如何，都需要有针对性地努力保持 PA，以度过中年。
