Patterns and determinants of physical activity in US adolescents
Patterns and determinants of physical activity in US adolescents
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DOI：
10.1016/j.jadohealth.2007.11.143
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发表时间：
2008-04-01
影响因子：
7.6
通讯作者：
Frazier, A. Lindsay
中科院分区：
文献类型：
--
作者：
Kahn, Jessica A.;Huang, Bin;Frazier, A. Lindsay
目的：本研究的目的是描述美国青少年样本中青少年体力活动的纵向趋势，并评估多个个体、父母和环境因素对青少年体力活动初始水平和变化率的影响。方法：研究对象是12，812名年龄在10至18岁之间的男孩和女孩，他们参加了今天的成长研究及其母亲。我们使用加速纵向分析来描述从1997年至1999年的身体活动的轨迹，随机效应线性混合模型，以确定哪些因素是独立相关的基线身体活动和身体活动随时间的变化。结果：平均时间的身体活动范围从7.3-11.6小时，每周在男孩和从8.0-11.2小时，每周在女孩。身体活动是最好的建模为年龄的二次函数，增加，直到青春期早期和下降后，13岁的男孩和女孩。多变量模型表明，与男孩和女孩基线时的身体活动水平相关的变量包括年龄、体重指数、心理社会变量、个人对体型的态度、感知的同伴对体型/健身的态度、父母对身体活动的态度、父母的身体活动和身体活动的环境障碍。年龄是唯一的因素，预测随着时间的推移，在体力活动的变化。结论：干预措施，以增加体力活动的青少年应该开始青春期之前。干预措施可能会更有效，如果他们是多模式的，并侧重于可改变的个人，父母和环境因素。(c)2008青少年医学会。All rights reserved.
Purpose: The objectives of this study were to describe longitudinal trends in adolescent physical activity in a sample of U.S. adolescents and to assess the effect of multiple individual, parental, and environmental factors on initial level and rates of change in adolescent physical activity.Methods: Study subjects were 12,812 boys and girls 10 to 18 years of age who were participating in the Growing Up Today Study and their mothers. We used accelerated longitudinal analysis to describe trajectories of physical activity from 1997-1999, and random effects linear mixed models to determine which factors were independently associated with baseline physical activity and changes in physical activity over time.Results: Mean hours of physical activity ranged from 7.3-11.6 hours per week in boys and from 8.0-11.2 hours per week in girls. Physical activity was best modeled as a quadratic function of age, increasing until early adolescence and declining after age 13 in boys and girls. Multivariable modeling demonstrated that variables associated with physical activity level at baseline in boys and girls were age, body mass index, psychosocial variables, personal attitudes about body shape, perceived peer attitudes about body shape/fitness, parental attitudes about physical activity, parental physical activity, and environmental barriers to physical activity. Age was the only factor that predicted change in physical activity over time.Conclusions: Interventions to increase physical activity in adolescents should begin before adolescence. Interventions may be more effective if they are multimodal and focus on modifiable individual, parental, and environmental factors. (c) 2008 Society for Adolescent Medicine. All rights reserved.