Mediators of physical activity behavior change: A multivariate approach
Mediators of physical activity behavior change: A multivariate approach
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DOI：
10.1037/0278-6133.27.4.409
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发表时间：
2008-07-01
影响因子：
4.2
通讯作者：
Marcus, Bess H.
中科院分区：
文献类型：
--
作者：
Napolitano, Melissa A.;Lewis, Beth A.;Marcus, Bess H.
目的：使用Baron和Kenny（1986）中介框架的多变量扩展，我们研究了假设为中介动机定制的体力活动干预与239名健康、活动不足的成年人（M年龄= 47.5; 82%女性）6个月体力活动行为之间关系的变量的同时效应。设计：参与者被随机分配到（a）基于打印的反馈;（B）基于电话的反馈;或（c）接触控制。主要结果测量：心理社会变量，包括自我效能，决策平衡和变化的过程。结果：两个干预组均满足所有中介标准。发现印刷品的中度间接效应（0.39，95% CI = 0.21，0.57）是由于行为过程的增加（0.54，95% CI = 0.29，0.80）被认知过程的减少（-0. 17，95%CI =-0.31，03）。观察到电话的中度间接影响（0.47，95% CI = 0.28，0.66），由于行为过程而增加（0.61，95% CI = 0.34，0.87）因认知过程导致的降低而减弱（0.15，95% CI =-0.27，-0.02）;自我效能和决策平衡的中介路径没有达到统计学意义。结论：这些发现强调了研究的重要性，这些研究解构了干预措施的理论组成部分，以确定哪种组合以最低的成本产生最大的行为变化。
Objective: Using a multivariate extension of the Baron and Kenny (1986) mediation framework, we examined the simultaneous effect of variables hypothesized to mediate the relationship between a motivationally tailored physical activity intervention, and 6-month physical activity behavior in 239 healthy, underactive adults (M age = 47.5; 82% women). Design: Participants were randomly assigned to (a) print-based feedback; (b) telephone-based feedback; or (c) contact control. Main Outcome Measures: Psychosocial variables, including self-efficacy, decisional balance, and processes of change. Results: All mediation criteria were satisfied for both intervention arms. A moderate indirect effect of print (0.39, 95% CI = 0.21, 0.57) was found due to increases in behavioral processes (0.54, 95% CI = 0.29, 0.80) being attenuated by decreases due to cognitive processes (-0. 17, 95%CI = -0.31,03). A moderate indirect effect was observed for telephone (0.47, 95% CI = 0.28, 0.66), with increases due to behavioral processes (0.61, 95% CI = 0.34, 0.87) attenuated by decreases due to cognitive processes (0.15, 95% CI = -0.27, -0.02); self-efficacy and decisional balance mediational paths did not attain statistical significance. Conclusions: These findings highlight the importance of studies that deconstruct the theoretical components of interventions to determine which combination produces the greatest behavior changes at the lowest cost.