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Health Education & Behavior
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Article

Psychological Factors Associated With Weight Loss in Obese and Severely Obese Women in a Behavioral Physical Activity Intervention

James J. Annesi, PhD1* and Ann C. Whitaker, BS, RD2

1 YMCA of Metropolitan Atlanta, Georgia
2 Kaiser Permanente, Oakland, California

* To whom correspondence should be addressed. E-mail: jamesa{at}ymcaatlanta.org.


  Abstract
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/m2; n = 116), and Class III (BMI ≥ 40.0 kg/m2; 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.

First published on February 18, 2009
Health Education & Behavior 2009, doi:10.1177/1090198109331671
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