da Silva Bruna Gonçalves C, Menezes Ana M B, Wehrmeister Fernando C, Barros Fernando C, Pratt Michael
Postgraduate Program in Epidemiology, Federal University of Pelotas, Pelotas, RS, Brazil.
Postgraduate Program in Health and Behavior, Catholic University of Pelotas, Pelotas, RS, Brazil.
Int J Behav Nutr Phys Act. 2017 Jun 23;14(1):82. doi: 10.1186/s12966-017-0536-5.
Adolescents spend many hours in sitting activities as television viewing, video game playing and computer use. The relationship between sedentary behavior and respiratory health remains poorly elucidated. To date there have been no studies evaluating the relationship between sedentary behavior and pulmonary function in young populations. The purpose of this study is to examine the association between the trajectory of screen-based sedentary behavior from 11 to 18 years and pulmonary function at 18 years in a Brazilian birth cohort.
Data from a longitudinal prospective study conducted among the participants of the 1993 Pelotas (Brazil) Birth Cohort. Time spent on television, video games, and computers during a weekday was self-reported at ages 11, 15 and 18 years. For each age, sedentary behavior was defined as the sum of time spent on these screen-based activities. To evaluate the sedentary behavior trajectory during adolescence group-based trajectory modeling was used. Outcome variables were three pulmonary function parameters: forced expiratory volume in one second (FEV), forced vital capacity (FVC), and peak expiratory flow (PEF), evaluated by spirometry, at 18 years expressed as z-scores. Crude and adjusted linear regressions, stratified by sex, were performed.
The three-group trajectory of sedentary behavior was the best fitting model. The trajectory groups were: always high (representing 38.8% of the individuals), always moderate (54.1%), and always low (7.1%). In the adjusted analyses, boys in the always-low group for sedentary behavior had higher FVC at 18 years (β = 0.177; 95% CI:0.027;0.327; p = 0.021) than boys in the always-high group. There were no differences for other pulmonary function parameters in boys. No significant association was found for girls.
The trajectory of screen-based sedentary behavior throughout adolescence was not consistent associated with pulmonary function at 18 years.
青少年花费大量时间进行久坐活动，如看电视、玩电子游戏和使用电脑。久坐行为与呼吸健康之间的关系仍未得到充分阐明。迄今为止，尚无研究评估年轻人群中久坐行为与肺功能之间的关系。本研究的目的是在一个巴西出生队列中，研究11至18岁基于屏幕的久坐行为轨迹与18岁时肺功能之间的关联。
数据来自对1993年佩洛塔斯（巴西）出生队列参与者进行的纵向前瞻性研究。在11岁、15岁和18岁时，通过自我报告工作日花在电视、电子游戏和电脑上的时间。对于每个年龄，久坐行为定义为花在这些基于屏幕活动上的时间总和。为了评估青春期久坐行为轨迹，使用了基于群体的轨迹模型。结局变量是三个肺功能参数：一秒用力呼气量（FEV）、用力肺活量（FVC）和呼气峰值流速（PEF），在18岁时通过肺活量测定法评估，以z分数表示。进行了按性别分层的粗线性回归和校正线性回归。
久坐行为的三组轨迹是最佳拟合模型。轨迹组为：始终高（占个体的38.8%）、始终中等（54.1%）和始终低（7.1%）。在校正分析中，久坐行为始终处于低水平组的18岁男孩的FVC高于始终处于高水平组的男孩（β = 0.177；95%CI：0.027；0.327；p = 0.021）。男孩的其他肺功能参数没有差异。未发现女孩有显著关联。
整个青春期基于屏幕的久坐行为轨迹与18岁时的肺功能没有一致的关联。
