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Healthy for Life: A Randomized Trial Examining Physical Activity Outcomes and Psychosocial Mediators |
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| Authors: | Beth A. Lewis Ph.D. David M. Williams Ph.D. Brian C. Martinson Ph.D. Shira Dunsiger Ph.D. Bess H. Marcus Ph.D. |
| Affiliation: | 1. University of Minnesota, 1900 University Ave SE, Cooke Hall, Minneapolis, MN, 55455, USA 2. Brown University, Box G-S121-8, Providence, RI, 02912, USA 3. HealthPartners Research Foundation, Mail Stop: 21111R, 8170 33rd Avenue South, P.O. Box 1524, Minneapolis, MN, 55440-1524, USA 4. The Miriam Hospital & Brown Medical School, Centers for Behavioral and Preventive Medicine, Coro Building East, 167 Pine St, Suite 1B, Providence, RI, 02903, USA 5. University of California, San Diego, UCSD School of Medicine, 9500 Gilman Drive, La Jolla, CA, 92093, USA |
| Abstract: | BackgroundResearchers theorize that interventions increase physical activity by influencing key theory-based mediators (e.g., behavioral processes). However, few studies have been adequately powered to examine the importance of mediators.PurposeThis study examined both physical activity behavior and psychosocial mediators in a randomized trial specifically powered to detect mediation.MethodsHealthy, 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).ResultsThe print intervention arm exhibited greater increases in physical activity than the control arm at 6 and 12 months (p?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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