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Journal of Obesity
Volume 2011, Article ID 921916, 6 pages
Research Article

Impact of Baseline BMI upon the Success of Latina Participants Enrolled in a 6-Month Physical Activity Intervention

1Department of Family and Preventive Medicine, University of California, San Diego, 3855 Health Sciences Drive No. 0901, La Jolla, CA 92093-0901, USA
2Centers for Behavioral and Preventive Medicine, The Miriam Hospital and Warren Alpert Medical School of Brown University, Providence, RI 02903, USA
3Department of Health Behavior, University of Alabama at Birmingham, Brimingham, AL 35293, USA
4The National Center on Addiction and Substance Abuse, Columbia University, New York, NY 10017, USA

Received 10 June 2011; Revised 21 September 2011; Accepted 11 October 2011

Academic Editor: Jack A. Yanovski

Copyright © 2011 Sheri J. Hartman et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


High rates of obesity in Latinas highlight the need to determine if physical activity interventions are equally effective across the body mass index (BMI) range. Thus, this study assessed how BMI impacts success of Spanish-speaking Latinas in a culturally and linguistically adapted theory-based physical activity intervention ( 𝑁 = 4 5 ). Longitudinal regression models tested the relationship between baseline BMI and outcomes. Overall, a trend for a negative association was found between baseline BMI and self-reported physical activity and theoretical constructs targeted by the intervention over time. For example, someone with a 25 kg/m2 BMI would report, on average, 27.5 more minutes/week of activity compared to someone with a 30 kg/m2 BMI at followup. Furthermore, higher baseline BMI was significantly associated with lower self-efficacy, behavioral and cognitive processes of change, and family social support over time. These findings suggest that participants with higher BMI may need additional intervention to promote physical activity.