Kwon Soyang, Wehrmeister Fernando C, Gonçalves Helen, da Silva Bruna Gonçalves C, Menezes Ana M B
Department of Pediatrics, Northwestern University, Chicago, IL 60611, USA.
Post-Graduate Program in Epidemiology, Federal University of Pelotas, Peloas CEP96020-220, RS, Brazil.
Children (Basel). 2023 Jan 31;10(2):265. doi: 10.3390/children10020265.
A prior study conducted in high-income countries demonstrated that specific sedentary behavior, such as TV viewing, is prospectively associated with adiposity in both active and inactive adolescents. The aim of this study was to examine the joint associations of sedentary behaviors and moderate- and vigorous-intensity physical activity (MVPA) with adiposity among Brazilian adolescents. This prospective cohort study included 377 participants of the 1993 Pelotas (Brazil) Study who completed an accelerometry assessment at age 13 years and a dual-energy X-ray absorptiometry (DXA) assessment at age 18 years. Accelerometer-measured MVPA was dichotomized into high (≥60 min/day) and low (<60 min/day). Accelerometer-measured sedentary time (SED) was dichotomized into low (<49 min/h) and high (≥49 min/h) based on the median. Self-reported TV viewing time was also dichotomized into low (<3 h/day) and high (≥3 h/day) based on the median. We combined the two MVPA groups (high and low) and two SED groups (low and high) to form the four MVPA&SED groups: high&low, high&high, low&low, and low&high. We also created four MVPA&TV groups in the same manner. Fat mass index (FMI; kg/m) was calculated using DXA-derived fat mass. Multivariable linear regression analyses compared FMI at 18 years among the four MVPA&SED groups and among the four MVPA&TV groups, adjusting for socioeconomic status, energy intake, and baseline adiposity. The analysis results showed that SED or TV viewing time was not prospectively associated with adiposity in both active and inactive Brazilian adolescents. This study suggests that the association between specific sedentary behaviors, such as TV viewing, and adiposity may differ across societal settings-in this case, high-income vs. middle-income countries.
先前在高收入国家进行的一项研究表明，特定的久坐行为，如看电视，在活跃和不活跃的青少年中都与肥胖呈前瞻性关联。本研究的目的是探讨巴西青少年久坐行为与中等强度和高强度身体活动（MVPA）与肥胖的联合关联。这项前瞻性队列研究纳入了1993年佩洛塔斯（巴西）研究的377名参与者，他们在13岁时完成了加速度计评估，并在18岁时完成了双能X线吸收法（DXA）评估。通过加速度计测量的MVPA被分为高（≥60分钟/天）和低（<60分钟/天）两类。根据中位数，通过加速度计测量的久坐时间（SED）被分为低（<49分钟/小时）和高（≥49分钟/小时）两类。自我报告的看电视时间也根据中位数分为低（<3小时/天）和高（≥3小时/天）两类。我们将两个MVPA组（高和低）和两个SED组（低和高）组合起来，形成四个MVPA&SED组：高&低、高&高、低&低和低&高。我们也以同样的方式创建了四个MVPA&电视组。使用DXA得出的脂肪量计算脂肪质量指数（FMI；kg/m）。多变量线性回归分析比较了四个MVPA&SED组和四个MVPA&电视组中18岁时的FMI，并对社会经济地位、能量摄入和基线肥胖进行了调整。分析结果表明，在活跃和不活跃的巴西青少年中，SED或看电视时间与肥胖均无前瞻性关联。本研究表明，特定的久坐行为，如看电视，与肥胖之间的关联可能因社会环境而异——在本案例中，是高收入国家与中等收入国家之间的差异。
