Lubans David Revalds, Foster Charlie, Biddle Stuart J H
School of Education, The University of Newcastle, Australia.
Prev Med. 2008 Nov;47(5):463-70. doi: 10.1016/j.ypmed.2008.07.011. Epub 2008 Jul 29.
The effectiveness of interventions to promote physical activity in youths is still developing. To develop a better understanding "what works", researchers are now focusing on constructing an evidence base for mediators of behavior change.
We reviewed studies that examined the direct effect of physical activity interventions on hypothesized mediators and the relationship between mediators and physical activity in young people (aged 5 to 18 years). Studies were identified via electronic database searches and scanning references against predetermined quality criteria.
We found seven studies that evaluated three mediator groups: cognitive, behavioral and interpersonal mediators. Self-efficacy was the most commonly assessed mediator in youth interventions and there was strong support for its role in mediating the relation between theory-based interventions and physical activity. There was some support for the importance of behavioral strategies as mediators of behavior, but no support for the mediating influence of interpersonal factors.
Despite recognition of the importance of mediation studies, few interventions have assessed mediators of physical activity behavior in youth interventions. The small number of studies examining mediators of behavior and the variability in study design and quality prevent us from forming strong conclusions regarding the most effective mediators of behavior.
促进青少年身体活动的干预措施的有效性仍在发展中。为了更好地理解“什么有效”，研究人员目前正专注于构建行为改变中介因素的证据基础。
我们回顾了研究身体活动干预对假设中介因素的直接影响以及中介因素与青少年（5至18岁）身体活动之间关系的研究。通过电子数据库搜索和对照预定质量标准筛选参考文献来确定研究。
我们发现七项研究评估了三个中介因素组：认知、行为和人际中介因素。自我效能感是青少年干预中最常被评估的中介因素，并且有强有力的证据支持其在介导基于理论的干预措施与身体活动之间关系中的作用。行为策略作为行为中介因素的重要性有一定证据支持，但人际因素的中介影响没有得到支持。
尽管认识到中介研究的重要性，但很少有干预措施评估青少年干预中身体活动行为的中介因素。研究行为中介因素的研究数量较少以及研究设计和质量的差异使我们无法就最有效的行为中介因素得出强有力的结论。
