Abstract P122: Fidelity to Motivational Interviewing and Weight Loss in Young Adults: Cellphone Intervention for You (CITY) Trial
Background: Weight loss interventions for obese young adults may reduce serious health complications later in life. Motivational Interviewing (MI) is part of behavioral weight loss intervention. Effective delivery of MI is variable; therefore, we assessed whether fidelity to MI was associated with change in weight and dietary pattern in overweight/obese young adults.
Methods: The Cellphone Intervention for You (CITY) trial was a 24-month behavioral intervention that randomized 365 overweight/obese (BMI >25 kg/m2) young adults (aged 18-35 years) to a weight loss program delivered by either mobile technology or interventionist-led personal coaching (PC) phone calls, or to a control condition. PC participants attended a series of 6-weekly group meetings immediately followed by monthly audio-recorded phone calls conducted by an interventionist trained to deliver weight loss counseling using MI. We coded the first monthly PC phone call using Motivational Interviewing Treatment Integrity Version (MITI) 3.1.1 and evaluated the impact of MITI summary scores on changes in weight and Healthy Eating Index (HEI) at 6 months.
Results: Our study population was comprised of 74 participants with available audio-recordings. There were 73% (N=54) women and 49% minorities with a mean age of 29 ± 4 years and a mean BMI of 34.7 ± 7.3 kg/m2. Mean change in weight 6 months post-randomization was -3.1 ± 5.3 kg. Mean change in HEI was 3.3 ± 4.7. Mean MITI summary scores for global spirit, percent complex reflections and reflection-to-question ratio were 3.9 ± 0.8, 0.6 ± 0.3, and 0.5 ± 0.2, respectively. None were predictive of weight change 6 months post-randomization (table 1). Percent complex reflection was predictive of HEI, with a counterintuitive negative relationship (table 1).
Conclusions: In our study population of overweight/obese young adults, greater fidelity to MI in the first coaching call was not associated with greater weight change or improved HEI. Additional research is needed to further explore the impact of MI on behavior.
Author Disclosures: C.C. Tyson: None. P. Lin: None. L.C. Corsino: None. B.C. Batch: None. J.A. Gallis: None. S.C. Grambow: None. J. Schwager: None. D. Ernst: None. L.P. Svetkey: None.
- © 2015 by American Heart Association, Inc.