OBJECTIVE: To examine changes in motivation and the relationship of motivation to adherence to self-monitoring and weight loss in a 16-week Internet behavioral weight-loss intervention. DESIGN: Two-group randomized design. SETTING: This study was conducted over the Internet. PARTICIPANTS: Sixty-six women, ages 22-65, with a body mass index (BMI) between 25 and 40, and with a home computer with Internet access, participated. INTERVENTION: These data are from an Internet behavioral weight-loss program in which all participants received a face-to-face initial session followed by the 16-week Internet program. MAIN OUTCOME MEASURES: Adherence to self-monitoring and weight loss were the main outcome measures. ANALYSIS: Linear regression and mediation analysis using the Baron and Kenny method were conducted. RESULTS:Autonomous motivation increased initially and remained high for those who ultimately achieved a 5% weight loss, but declined over time for participants who did not achieve a 5% weight loss. Autonomous motivation at 4 weeks was a predictor of adherence to self-monitoring and 16-week weight loss. Adherence mediated the relationship between autonomous motivation and weight loss. CONCLUSIONS AND IMPLICATIONS: These results suggest that autonomous motivation may be a promising intervention target for promoting program procedure adherence and weight loss. Copyright2010 Society for Nutrition Education. Published by Elsevier Inc. All rights reserved.
RCT Entities:
OBJECTIVE: To examine changes in motivation and the relationship of motivation to adherence to self-monitoring and weight loss in a 16-week Internet behavioral weight-loss intervention. DESIGN: Two-group randomized design. SETTING: This study was conducted over the Internet. PARTICIPANTS: Sixty-six women, ages 22-65, with a body mass index (BMI) between 25 and 40, and with a home computer with Internet access, participated. INTERVENTION: These data are from an Internet behavioral weight-loss program in which all participants received a face-to-face initial session followed by the 16-week Internet program. MAIN OUTCOME MEASURES: Adherence to self-monitoring and weight loss were the main outcome measures. ANALYSIS: Linear regression and mediation analysis using the Baron and Kenny method were conducted. RESULTS: Autonomous motivation increased initially and remained high for those who ultimately achieved a 5% weight loss, but declined over time for participants who did not achieve a 5% weight loss. Autonomous motivation at 4 weeks was a predictor of adherence to self-monitoring and 16-week weight loss. Adherence mediated the relationship between autonomous motivation and weight loss. CONCLUSIONS AND IMPLICATIONS: These results suggest that autonomous motivation may be a promising intervention target for promoting program procedure adherence and weight loss. Copyright 2010 Society for Nutrition Education. Published by Elsevier Inc. All rights reserved.
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