Motivation, Self-Efficacy and Weight Loss in a RCT Weight Loss Intervention
Background: Research on the relationship between motivation, and dieting and exercise self-efficacy, and weight loss has produced inconsistent findings. Thus, this study aims to explore and clarify the relationship between these constructs.
Method: This study evaluated 429 participants who were part of a larger RCT. Participants were randomized into three groups of progressive, increasing intensity: workbook only, computer intervention and computer intervention plus staff. Weight and height were collected at baseline, 6 months and 12 months. Average initial body mass index (BMI) was 35.36. Participants also completed the Dieting Readiness Questionnaire, the Eating Habits Confidence Survey and the Exercise Confidence Survey at baseline. We hypothesized that motivation and self-efficacy would predict change in BMI regardless of group assignment.
Results: Factor analyses confirmed that each survey examined a unitary construct, yet Pearson’s product moment correlations found no significant relationship between change in BMI and motivation and self-efficacy surveys. Mean difference for change in BMI was significant for the highest intensity intervention group (M = -1.19, SE = .17) when compared to the lowest (M = -.37, SD = 2.44), F(2,426) = 3.79, p = .02). The majority of this overall change difference was further isolated to the first half of the study, F(2,426) = 6.91, p = .001.
Conclusion: Findings suggest initial motivation is less related to weight loss than is clinical support. It is unclear how self-efficacy fluctuated throughout the study; further evaluation may be necessary to utilize motivation and self-efficacy to enhance weight loss.
Bandura, A. (1977). Self-efficacy: toward a unifying theory of behavioral change. Psychological Review, 84(2), 191–215. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/847061
Bernier, M., & Avard, J. (1986). Self-efficacy, outcome, and attrition in a weight-reduction program. Cognitive Therapy and Research, 10(3), 319–338. doi:10.1007/BF01173469
Bray, George A., and Claude Bouchard. Handbook of Obesity - Volume 2 Clinical Applications, Fourth Edition. 4th ed. Hoboken: Taylor and Francis, 2014. Print.
Byrne, S., Barry, D., & Petry, N. M. (2012). Predictors of weight loss success. Exercise vs. dietary self-efficacy and treatment attendance. Appetite, 58(2), 695–8. doi:10.1016/j.appet.2012.01.005
Decker, J.W., and Dennis, K.E. (2013) The Eating Habits Confidence Survey: Reliability and Validity in Overweight and Obese Postmenopausal Women. Journal of Nursing Measurement, 21, Number 1, 110-119(10).
Elfhag, K., & Rössner, S. (2005). Who succeeds in maintaining weight loss? A conceptual review of factors associated with weight loss maintenance and weight regain. Obesity Reviews : An Official Journal of the International Association for the Study of Obesity, 6(1), 67–85. doi:10.1111/j.1467-789X.2005.00170.x
Fontaine, K. R., & Cheskin, L. J. (1997). Self-efficacy, attendance, and weight loss in obesity treatment. Addictive Behaviors, 22(4), 567–70. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/9290865
Harvey-Berino, J., Pintauro, S. J., & Gold, E. C. (2002). The Feasibility of Using Internet Support for the Maintenance of Weight Loss. Behavior Modification, 26(1), 103–116. doi:10.1177/0145445502026001006
Health, N. I. of. (2012). Very Low-Calorie Diets. Drug and therapeutics bulletin (Vol. 50).
Jeffery, R. W., Bjornson-Benson, W. M., Rosenthal, B. S., Lindquist, R. a, Kurth, C. L., & Johnson, S. L. (1984). Correlates of weight loss and its maintenance over two years of follow-up among middle-aged men. Preventive Medicine, 13(2), 155–68. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/6739444
Linde, J. A., Rothman, A. J., Baldwin, A. S., & Jeffery, R. W. (2006). The impact of self-efficacy on behavior change and weight change among overweight participants in a weight loss trial. Health Psychology : Official Journal of the Division of Health Psychology, American Psychological Association, 25(3), 282–91. doi:10.1037/0278-6126.96.36.1992
Martin, C. K., O’Neil, P. M., & Binks, M. (2002). An attempt to identify predictors of treatment outcome in two comprehensive weight loss programs. Eating Behaviors, 3(3), 239–48. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/15001002
Martin, P. D., Dutton, G. R., & Brantley, P. J. (2004). Self-efficacy as a predictor of weight change in African-American women. Obesity Research, 12(4), 646–51. doi:10.1038/oby.2004.74
Norman, G., & Zabinski, M. (2007). A Review of eHealth Interventions for Physical Activity and Dietary Behavior Change. American Journal of …, 33(4), 336–345. Retrieved from http://www.sciencedirect.com/science/article/pii/S0749379707003637
Sallis, J.F., Pinski, R.B., Grossman, R.M., Patterson,T.L., and Nader, P.R. (1988). The development of self-efficacy scales for health-related diet and exercise behaviors. Health Education Research, 3, 283-292.
Teixeira, P. J., Palmeira, A. L., Branco, T. L., Martins, S. S., Minderico, C. S., Barata, J. T., … Sardinha, L. B. (2004). Who will lose weight? A reexamination of predictors of weight loss in women. The International Journal of Behavioral Nutrition and Physical Activity, 1(1), 12. doi:10.1186/1479-5868-1-12
Vandelanotte, C., De Bourdeaudhuij, I., Sallis, J. F., Spittaels, H., & Brug, J. (2005). Efficacy of sequential or simultaneous interactive computer-tailored interventions for increasing physical activity and decreasing fat intake. Annals of Behavioral Medicine : A Publication of the Society of Behavioral Medicine, 29(2), 138–46. doi:10.1207/s15324796abm2902_8
Warziski, M. T., Sereika, S. M., Styn, M. a, Music, E., & Burke, L. E. (2008). Changes in self-efficacy and dietary adherence: the impact on weight loss in the PREFER study. Journal of Behavioral Medicine, 31(1), 81–92. doi:10.1007/s10865-007-9135-2
Webber, K. H., Gabriele, J. M., Tate, D. F., & Dignan, M. B. (2010). The effect of a motivational intervention on weight loss is moderated by level of baseline controlled motivation. The International Journal of Behavioral Nutrition and Physical Activity, 7, 4. doi:10.1186/1479-5868-7-4
Wing, R. R., & Phelan, S. (2005). Long-term weight loss maintenance. The American Journal of Clinical Nutrition, 82(1 Suppl), 222S–225S. Retrieved from http://www.ncbi.nlm.nih.gov/pubmed/16002825
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