Physical Activity, Not Sedentary Time, Predicts Dual-Energy X-ray Absorptiometry-measured Adiposity Age 5 to 19 Years
Physical Activity, Not Sedentary Time, Predicts Dual-Energy X-ray Absorptiometry-measured Adiposity Age 5 to 19 Years
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DOI：
10.1249/mss.0000000000001336
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发表时间：
2017-10-01
期刊：
影响因子：
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通讯作者：
Levy, Steven M.
中科院分区：
文献类型：
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作者：
Janz, Kathleen F.;Boros, Piroska;Levy, Steven M.
目的：研究从儿童期到青少年期（5-19岁），体力活动（PA）、久坐时间（SED）和看电视（TV）与脂肪量（FAT）和内脏脂肪组织量（VAT）之间的关系。方法：对爱荷华州骨发育研究的参与者（n = 230名男性和233名女性）在5岁、8岁、11岁、13岁、15岁、17岁和19岁时进行检查。加速度计测量中等强度或剧烈强度PA（MVPA; min.d（-1））、光强度PA（LPA; min.d（-1））和SED（h.d（-1））。父母代理报告（5和8岁）和儿童报告（11、13、15、17和19岁）测量TV（h.d（-1））。X线吸收法扫描测量FAT（kg）和VAT（g）。性别特异性生长模型用于创建个体参与者的FAT和VAT生长曲线（1级），并在调整体重，身高，线性年龄，非线性年龄和成熟度后测试MVPA，LPA，SED和TV（2级）的影响。结果：生长模型表明，低水平的MVPA与高水平的脂肪和增值税的男性和高水平的脂肪的女性。对于男性和女性，看电视与脂肪和增值税呈正相关。男性LPA与FAT呈正相关。男性和女性久坐时间与FAT和VAT无相关性（P > 0.05）。结论：本研究支持目前的PA指南，重点是MVPA，而不是SED。高电视，而不是高SED，对高水平肥胖的贡献表明，电视对肥胖的贡献不仅仅是低能量消耗的函数。
Purpose: To examine the associations among physical activity (PA), sedentary time (SED), and TV viewing (TV) with fat mass (FAT) and visceral adipose tissue mass (VAT) from childhood through adolescence (5-19 yr). Methods: Participants in the Iowa Bone Development Study (n = 230 males and 233 females) were examined at ages 5, 8, 11, 13, 15, 17, and 19 yr. Accelerometers measured moderate-or vigorous-intensity PA (MVPA; min.d(-1)), light-intensity PA (LPA; min.d(-1)), and SED (h.d(-1)). Parent-proxy report (5 and 8 yr) and child-report (11, 13, 15, 17, and 19 yr) measured TV (h.d(-1)). X-ray absorptiometry scans measured FAT (kg) and VAT (g). Sex-specific growth models were used to create FAT and VAT growth curves for individual participants (level 1), and to test the effect of MVPA, LPA, SED, and TV (level 2) after adjusting for weight, height, linear age, nonlinear age, and maturity. Results: Growth models indicated that low levels of MVPA were associated with high levels of FAT and VAT for males and high levels of FAT for females. TV viewing was positively associated with FAT and VAT for males and females. LPA was positively associated with FAT in males. Sedentary time was not associated with FAT or VAT for males or females (P > 0.05). Conclusions: This study supports current PA guidelines focusing on MVPA rather than SED. The contribution of high TV, but not high SED, to high levels of adiposity suggests that TV's contribution to obesity is not just a function of low energy expenditure.