期刊
HEALTH PSYCHOLOGY
卷 27, 期 4, 页码 409-418出版社
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/0278-6133.27.4.409
关键词
mediators; physical activity; intervention studies; randomized controlled trial; multivariate analysis
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.
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