207460 Depression, physical activity, and BMI: Findings from the National Health and Nutrition Examination Survey 2005-2006

Wednesday, November 11, 2009

Wendy S. Bibeau, MEd , Department of Epidemiology and Biostatistics, University of Maryland, College Park, MD
Deborah R. Young, PhD , Department of Epidemiology and Biostatistics, University of Maryland, College Park, MD
BACKGROUND: Evidence suggests depression is an incapacitating, but treatable condition associated with impaired cognitive and physical functioning and decreased quality of life. Obese persons are more likely to suffer from depression than their normal weight peers. Regular physical activity (PA) can reduce depressive symptoms. However, the potential protective effect of PA on the relationship between depression and BMI (kg/m2) remains unclear.

PURPOSE: To examine the prevalence of depression by BMI weight status category and to determine the association between PA, BMI, and depression.

METHODS: The National Health and Nutrition Examination Survey (NHANES) 2005-2006 were used for analysis (n=4678, 52% female). Participants (aged ≥20) who scored ≥10 on the Patient Health Questionnaire were categorized as depressed. BMI was determined from measured height and weight, and PA from self-report. Multivariate regression models estimated adjusted ORs, controlling for age, gender, race/ethnicity, and education. Bonferroni adjustments were made because of multiple comparisons.

RESULTS: Multivariate models that included PA resulted in no difference in depression score for those with BMI 25-29.9 kg/m2 (overweight category; OR= 0.81, 95% CI: 0.5-1.2) or ≥30 kg/m2 (obese category; OR= 1.1, 95% CI: 0.7-1.8). However, individuals with regular PA were 60% less likely to be depressed than those who did not engage in regular moderate or vigorous PA (95% CI: 0.3-0.6), after controlling for BMI status.

CONCLUSIONS: Participation in regular moderate or vigorous PA appears to be associated with lower rates of depression, regardless of BMI.

Learning Objectives:
1. Describe the patterns of depression prevalence. 2. Discuss the relationship between physical activity, depression, and BMI. 3. Evaluate the importance of physical activity as it relates to depression.

Keywords: Depression, Physical Activity

Presenting author's disclosure statement:

Qualified on the content I am responsible for because: I formulated the research questions, analyzed the data, and wrote the abstract.
Any relevant financial relationships? No

I agree to comply with the American Public Health Association Conflict of Interest and Commercial Support Guidelines, and to disclose to the participants any off-label or experimental uses of a commercial product or service discussed in my presentation.