An understanding of physical activity through mediators of behaviour change is important to evaluate the efficacy of interventions. The purpose of this review is to update prior reviews with meta-analysis to evaluate the state of physical activity interventions that include proposed mediators of behaviour change. Literature was identified through searching for five key databases. Studies were eligible if they described a published experimental or quasi-experimental trial in English examining the effect of an intervention on physical activity behaviour and mediators in non-clinical adult populations with the necessary statistical information to be included in the meta-analytic structural equation modelling analysis. Fifty-one articles (49 samples) met the eligibility criteria. Small overall effects were identified for mediation paths a (r = .16; 95% CI = .10 to .22), b (r = .21; 95% CI .16 to .27), and c (r = .24; 95% CI .12 to .35), c' (r = .05 to .19) and ab (r = .02 to .07) that showed similar findings by theory and construct. The effect sizes seen in physical activity interventions are mediated by our current theories, but the effects are very small and no one construct/theory appears to be a critical driver of the mediated effect compared to any other. Innovation and increased fidelity of interventions is needed.

中文翻译：

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成人身体活动行为改变干预的中介因素：系统评价和荟萃分析。

通过行为改变的中介来了解身体活动对于评估干预措施的有效性很重要。本次审查的目的是通过荟萃分析更新先前的审查，以评估包括提议的行为改变中介在内的体育活动干预的状态。通过搜索五个关键数据库确定了文献。如果研究用英语描述了一项已发表的实验或准实验性试验，该试验检查干预对非临床成人人群的身体活动行为和介质的影响，并将必要的统计信息包含在元分析结构方程模型中，则该研究符合条件分析。51 篇文章（49 个样本）符合资格标准。中介路径 a (r = .16; 95% CI = .10 至 .22)、b (r = .21；95% CI .16 至 .27) 和 c (r = .24；95% CI .12 至 .35)、c' (r = .05 到 .19) 和 ab (r = .02 到 .07)，它们在理论和构造上显示出类似的发现。在身体活动干预中看到的效果大小受我们当前理论的调节，但效果非常小，与其他任何结构/理论相比，似乎没有任何结构/理论是中介效果的关键驱动因素。需要创新并提高干预措施的保真度。但影响非常小，与其他任何结构/理论相比，似乎没有任何结构/理论是中介效应的关键驱动因素。需要创新并提高干预措施的保真度。但影响非常小，与其他任何结构/理论相比，似乎没有任何结构/理论是中介效应的关键驱动因素。需要创新并提高干预措施的保真度。