Physical Activity, Sedentary Time, and Fatness in a Biethnic Sample of Young Children.
Physical Activity, Sedentary Time, and Fatness in a Biethnic Sample of Young Children.
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DOI：
10.1249/mss.0000000000001180
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发表时间：
2017-05
影响因子：
4.1
通讯作者：
Barber SE
中科院分区：
文献类型：
--
作者：
Collings PJ;Brage S;Bingham DD;Costa S;West J;McEachan RRC;Wright J;Barber SE
在一个主要由两个种族（南亚人和白色英国人）组成的幼儿样本中，研究客观测量的体力活动（PA）和久坐时间（ST）与肥胖的关系。样本包括333名11个月至5岁的儿童，他们提供了526个PA和身体成分的横断面观察结果。总PA体积（每分钟矢量幅度计数（cpm）），多个强度水平下的每日时间（活动的累积时间>500 cpm、>1000 cpm、>1500 cpm等直至>6000 cpm），以及久坐不动的时间用三轴加速度计估计轻度PA（820-3907 cpm）和中度至剧烈PA（MVPA：≥3908 cpm）。肥胖的指标包括BMI、腰围、肩胛下和三头肌皮褶厚度之和。采用多水平回归和调整混杂因素的等时替代模型进行统计分析。检查了种族对效应的影响。没有证据表明种族对效应有影响（p-相互作用≥0.13）。在整个样本中，超过3500 cpm的累积时间（即高光强PA）与皮肤褶皱的总和呈负相关（β（95% CI）= -0.60（-1.19至-0.021）mm/20 min/d），且相关程度随PA强度呈剂量依赖性增加（对于花费>6000 cpm的时间的峰值：-1.57（-3.01至-0.12）mm/20 min/d）。用MVPA替代ST 20 min/d与皮褶总和较低相关（-0.77（-1.46至-0.084）mm）。高光强度PA似乎对南亚和白色英国儿童的身体成分有益，但更高强度的PA更有利。
To investigate associations of objectively-measured physical activity (PA) and sedentary time (ST) with adiposity in a predominantly bi-ethnic (South Asian and White British) sample of young children. The sample included 333 children aged 11 months to 5 years who provided 526 cross-sectional observations for PA and body composition. Total PA volume (vector magnitude counts per minute (cpm)), daily time at multiple intensity levels (the cumulative time in activity >500 cpm, >1000 cpm, >1500 cpm and so on up to >6000 cpm), and time spent sedentary (<820 cpm), in light PA (820-3907 cpm) and moderate-to-vigorous PA (MVPA: ≥3908 cpm) were estimated with tri-axial accelerometry. Indicators of adiposity included BMI, waist circumference, and the sum of subscapular and triceps skinfold thicknesses. Statistical analyses were performed using multilevel regression and isotemporal substitution models adjusted for confounders. Effect modification by ethnicity was examined. There was no evidence for effect modification by ethnicity (p-interaction≥0.13). In the whole sample, the accumulated time spent above 3500 cpm (i.e. high light-intensity PA) was inversely associated with the sum of skinfolds (β (95% CI) = -0.60 (-1.19 to -0.021) mm per 20 min/d) and the magnitude of association increased dose-dependently with PA intensity (peaking for time spent >6000 cpm: -1.57 (-3.01 to -0.12) mm per 20 min/d). Substitution of 20 min/d of ST with MVPA was associated with a lower sum of skinfolds (-0.77 (-1.46 to -0.084) mm). High light-intensity PA appears to be beneficial for body composition in young South Asian and White British children, but higher-intensity PA is more advantageous.