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Although obesity is notoriously difficult to reverse and its recidivism is high, adopting and maintaining a physically active lifestyle is arguably the most effective strategy to counteract it in the long-term. The purposes of this study are twofold: i) to describe a 3-year randomized controlled trial (RCT) aimed at testing a novel obesity treatment program based on SDT, and ii) to present the rationale behind SDT's utility in facilitating and explaining health behavior change, especially physical activity\/exercise, during obesity treatment.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods<\/jats:title>\n            <jats:p>Study design, recruitment, inclusion criteria, measurements, and a detailed description of the intervention (general format, goals for the participants, intervention curriculum, and main SDT strategies) are presented. The intervention consists of a 1-year group behavioral program for overweight and moderately obese women, aged 25 to 50 (and pre-menopausal), recruited from the community at large through media advertisement. Participants in the intervention group meet weekly or bi-weekly with a multidisciplinary intervention team (30 2 h sessions in total), and go through a program covering most topics considered critical for successful weight control. These topics and especially their delivery were adapted to comply with SDT and Motivational Interviewing guidelines. Comparison group receive a general health education curriculum. After the program, all subjects are follow-up for a period of 2 years.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Discussion<\/jats:title>\n            <jats:p>Results from this RCT will contribute to a better understanding of how motivational characteristics, particularly those related to physical activity\/exercise behavioral self-regulation, influence treatment success, while exploring the utility of Self-Determination Theory for promoting health behavior change in the context of obesity.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Trial Registration<\/jats:title>\n            <jats:p>\n              <jats:bold>Clinical Trials Gov. Identifier<\/jats:bold> NCT00513084<\/jats:p>\n          <\/jats:sec>","DOI":"10.1186\/1471-2458-8-234","type":"journal-article","created":{"date-parts":[[2008,7,23]],"date-time":"2008-07-23T18:14:33Z","timestamp":1216836873000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":138,"title":["A randomized controlled trial to evaluate self-determination theory for exercise adherence and weight control: rationale and intervention description"],"prefix":"10.1186","volume":"8","author":[{"given":"Marlene N","family":"Silva","sequence":"first","affiliation":[]},{"given":"David","family":"Markland","sequence":"additional","affiliation":[]},{"given":"Cl\u00e1udia S","family":"Minderico","sequence":"additional","affiliation":[]},{"given":"Paulo N","family":"Vieira","sequence":"additional","affiliation":[]},{"given":"Margarida M","family":"Castro","sequence":"additional","affiliation":[]},{"given":"S\u00edlvia R","family":"Coutinho","sequence":"additional","affiliation":[]},{"given":"Teresa C","family":"Santos","sequence":"additional","affiliation":[]},{"given":"Margarida G","family":"Matos","sequence":"additional","affiliation":[]},{"given":"Lu\u00eds B","family":"Sardinha","sequence":"additional","affiliation":[]},{"given":"Pedro J","family":"Teixeira","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2008,7,9]]},"reference":[{"key":"1204_CR1","doi-asserted-by":"publisher","first-page":"233","DOI":"10.1111\/j.1467-789X.2006.00243.x","volume":"7","author":"I Carmo","year":"2006","unstructured":"Carmo I, Dos Santos O, Camolas J, Vieira J, Carreira M, Medina L, Reis L, Galvao-Teles A: Prevalence of obesity in Portugal. 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