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Healthy for life: a randomized trial examining physical activity outcomes and psychosocial mediators
Lewis BA, Williams DM, Martinson BC, Dunsiger S, Marcus BH
Annals of Behavioral Medicine 2013 Apr;45(2):203-212
clinical trial
7/10 [Eligibility criteria: Yes; Random allocation: Yes; Concealed allocation: Yes; Baseline comparability: Yes; Blind subjects: No; Blind therapists: No; Blind assessors: No; Adequate follow-up: Yes; Intention-to-treat analysis: Yes; Between-group comparisons: Yes; Point estimates and variability: Yes. Note: Eligibility criteria item does not contribute to total score] *This score has been confirmed*

BACKGROUND: Researchers theorize that interventions increase physical activity by influencing key theory-based mediators (eg, behavioral processes). However, few studies have been adequately powered to examine the importance of mediators. PURPOSE: This study examined both physical activity behavior and psychosocial mediators in a randomized trial specifically powered to detect mediation. METHODS: Healthy, sedentary adults (n = 448; 70% caucasian, 87% women, mean age was 43) were randomly assigned to either a 6-month print-based theory tailored physical activity intervention (n = 224) or a 6-month health/wellness contact control arm (n = 224). RESULTS: The print intervention arm exhibited greater increases in physical activity than the control arm at 6 and 12 months (p < 0.05). Additionally, behavioral processes were found to be an important mediator of physical activity behavior. CONCLUSIONS: It is important for researchers and practitioners to focus on increasing behavioral strategies for physical activity adoption. Future studies should examine other potential mediators of physical activity.

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