Re-evaluating the effect of age on physical activity over the lifespan
Re-evaluating the effect of age on physical activity over the lifespan
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DOI：
10.1016/j.ypmed.2017.05.030
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发表时间：
2017-08-01
影响因子：
5.1
通讯作者：
Zipunnikov, Vadim
中科院分区：
文献类型：
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作者：
Varma, Vijay R.;Dey, Debangan;Zipunnikov, Vadim
加速度计分析和可视化技术的进步使研究人员能够更精确地识别和比较整个生命周期中体力活动 (PA) 随年龄下降的关键时期，并描述日常 PA 模式在不同年龄组之间的变化。我们使用来自 2003-2006 年国家健康和营养检查调查 (NHANES) (n = 12,529) 队列的加速度计数据，使用广义相加模型构建的性别分层、年龄特定百分位曲线来量化整个生命周期中的总 PA 以及按强度划分的 PA。我们还使用平滑的双变量表面估计了每分钟的日间 PA。我们发现，从儿童期到青春期（6-19 岁），不同性别的 PA 随年龄的增长而急剧降低，部分原因是早晨 PA 开始较晚。 19 岁时的总 PA 水平与 60 岁时的水平相当。与之前的证据相反，在青年期（20-30 岁），总 PA 和光强度随着年龄的增长而增加，然后在中年（31-59 岁）期间稳定下来，部分原因是早晨 PA 开始较早。我们还发现，与女性相比，男性在中年时的 PA 降低得更早，并且在老年时总 PA 较低、久坐行为较多、光强度较低；与女性相比，这些趋势似乎是由于下午的 PA 较低所致。我们的结果建议重新评估成年初期如何影响 PA 水平，以及在制定 PA 干预措施时考虑一天中的时间和性别差异的重要性。 (C) 2017 Elsevier Inc. 保留所有权利。
Advancements in accelerometer analytic and visualization techniques allow researchers to more precisely identify and compare critical periods of physical activity (PA) decline by age across the lifespan, and describe how daily PA patterns may vary across age groups. We used accelerometer data from the 2003-2006 cohorts of the National Health and Nutrition Examination Survey (NHANES) (n = 12,529) to quantify total PA as well as PA by intensity across the lifespan using sex-stratified, age specific percentile curves constructed using generalized additive models. We additionally estimated minute-to-minute diurnal PA using smoothed bivariate surfaces. We found that from childhood to adolescence (ages 6-19) across sex, PA is sharply lower by age partially due to a later initiation of morning PA. Total PA levels, at age 19 are comparable to levels at age 60. Contrary to prior evidence, during young adulthood (ages 20-30) total and light intensity PA increases by age and then stabilizes during midlife (ages 31-59) partially due to an earlier initiation of morning PA. We additionally found that males compared to females have an earlier lowering in PA by age at midlife and lower total PA, higher sedentary behavior, and lower light intensity PA in older adulthood; these trends seem to be driven by lower PA in the afternoon compared to females. Our results suggest a re-evaluation of how emerging adulthood may affect PA levels and the importance of considering time of day and sex differences when developing PA interventions. (C) 2017 Elsevier Inc. All rights reserved.