Dept of Epidemiology and Biostatistics, University of South Carolina, Columbia, SC, USA.
J Phys Act Health. 2010 Jul;7(4):465-74. doi: 10.1123/jpah.7.4.465.
We examined the covarying patterns of physical activity and sedentary behaviors among adolescents and their long-term maintenance.
Data came from the National Longitudinal Study of Adolescent Health (1995-2002). We used latent class analysis to identify distinct covarying patterns in adolescence. Logistic regression models were used to predict odds of meeting moderate-to-vigorous physical activity (MVPA) recommendations (> or = 5 bouts/week) and exceeding screen time guidelines (> 2 hours/day) 6 years later based on their adolescent class profile.
Five classes for each gender were identified and labeled as low physical activity (PA)/low sedentary behaviors (SED), moderate (Mod) PA/high (HI) SED, Mod PA/low SED, HI PA/low SED, and HI PA (except skating/biking)/low SED. Compared with low PA/low SED, males and females in Mod PA/low SED, HI PA/low SED, and HI PA (except skating/biking)/low SED classes had increased odds of meeting MVPA recommendations in young adulthood. Mod PA/HI SED had higher odds of exceeding screen time guidelines in young adulthood (adjusted odds ratio [AOR] for females: 1.67, 95% CI: 1.00-2.81; AOR for males: 3.31, 95% CI: 1.80-6.09).
Findings are useful to aid the development of multifactorial interventions that promote physical activity and reduce screen time among adolescents transitioning to adulthood.
本研究旨在探讨青少年身体活动和久坐行为的共变模式及其长期维持情况。
数据来自全国青少年健康纵向研究（1995-2002 年）。我们采用潜在类别分析来识别青少年时期不同的共变模式。基于青少年时期的类别特征，采用逻辑回归模型预测 6 年后达到中高强度体力活动（MVPA）推荐量（每周>5 次）和超过屏幕时间指导值（每天>2 小时）的可能性。
为每个性别确定并标记了 5 个类别，分别为低体力活动（PA）/低久坐行为（SED）、中（Mod）PA/高（HI）SED、Mod PA/低 SED、HI PA/低 SED 和 HI PA（除滑冰/骑自行车外）/低 SED。与低 PA/低 SED 相比，Mod PA/低 SED、HI PA/低 SED 和 HI PA（除滑冰/骑自行车外）/低 SED 类别的男性和女性，更有可能在成年早期达到 MVPA 推荐量。Mod PA/HI SED 更有可能在成年早期超过屏幕时间指导值（女性的调整后优势比 [AOR]：1.67，95%CI：1.00-2.81；男性的 AOR：3.31，95%CI：1.80-6.09）。
这些发现有助于制定多因素干预措施，促进青少年向成年期过渡时的身体活动和减少屏幕时间。
