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Unformatted text preview: http://heb.sagepub.com/ Behavior Health Education & http://heb.sagepub.com/content/37/4/593 The online version of this article can be found at: DOI: 10.1177/1090198109331671 2010 37: 593 originally published online 18 February 2009 Health Educ Behav James J. Annesi and Ann C. Whitaker Obese Women in a Behavioral Physical Activity Intervention Psychological Factors Associated With Weight Loss in Obese and Severely Published by: http://www.sagepublications.com On behalf of: Society for Public Health Education can be found at: Health Education & Behavior Additional services and information for http://heb.sagepub.com/cgi/alerts Email Alerts: http://heb.sagepub.com/subscriptions Subscriptions: http://www.sagepub.com/journalsReprints.nav Reprints: http://www.sagepub.com/journalsPermissions.nav Permissions: http://heb.sagepub.com/content/37/4/593.refs.html Citations: at BRIGHAM YOUNG UNIV on September 13, 2010 heb.sagepub.com Downloaded from Psychological Factors Associated With Weight Loss in Obese and Severely Obese Women in a Behavioral Physical Activity Intervention James J. Annesi, PhD Ann C. Whitaker, BS, RD The behavioral processes of weight reduction are poorly understood, and responses to treatments based primarily on caloric restriction have been unfavorable. A theory-based path derived from proposed relations of physical activity, changes in psychological factors, and weight loss was separately tested with women with Class I and Class II obesity (body mass index [BMI] from 30 to 39.9 kg/m 2 ; n = 116), and Class III (BMI 40.0 kg/m 2 ; n = 57) obesity. Participation in a cognitive-behavioral exercise support treatment along with nutrition education was significantly associated with changes in measures of self-efficacy, body satisfaction, and mood. Changes did not significantly differ by BMI group. Multiple regression analyses indicated that changes in the psychological factors explained 14% (Class I/II obesity group) and 22% (Class III obesity group) of the variance in exercise session attendance, and attendance was strongly related to weight loss. Implications for weight loss theory and treatment are discussed. Keywords: physicalactivity;self-efficacy;socialcognitivetheory Approximately 65% of American adults are currently either overweight (body mass index [BMI] = 25.0 to 29.9 kg/m 2 ) or obese (BMI 30.0 kg/m 2 ; Hedley et al., 2004). More women (33.4%) are obese than men (27.5%). Trends toward a similar prevalence of being overweight and obese are also present in the European Union (Fry & Finley, 2005) and Canada (Tremblay, Katzmarzyk, & Willms, 2002). Obesity is a prominent modifiable risk factor for type 2 diabetes, coronary heart disease, hypertension, and some forms of cancer. Internationally, obesity has been further classified into Class I (BMI 30.0 to 34.9), Class II (BMI 35.0 to 39.9), and Class III (BMI 40) obesity (Aronne, 2002). Class III obesity is also referred to as severe, or morbid, obesity and is (Aronne, 2002)....
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