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Background: We examined associations among multilevel variables and girls' physical activity to determine whether they vary at different adolescent ages. Methods: All field sites of the Trial of Activity for Adolescent Girls contributed participants from 6th (n = 1576) and 8th grades (n = 3085). The Maryland site contributed an 11th grade sample (n = 589). Questionnaires were used to obtain demographic and psychosocial information (individual- and social-level variables); height, weight, and triceps skinfold to assess body composition; interviews and surveys for school-level data; and geographical information systems and self-report for neighborhood-level variables. Moderate to vigorous physical activity minutes (MVPA) were assessed from accelerometers. Mixed models (13 individual, 5 social, 15 school, 12 neighborhood variables) were used to determine multilevel associations. Results: Variables at individual, social, school, and neighborhood levels were associated with MVPA, but differed across grades. Lower percent body fat, higher social support from friends, and lower school math scores were associated with higher MVPA at 6th and 8th grade. Higher physical activity self-efficacy was associated with higher MVPA at 11th grade. Only lower physical activity barriers were associated with higher MVPA at all grades. Conclusion: MVPA is a complex behavior with fluid, multilevel correlates that differ among girls across middle and high school. [ABSTRACT FROM AUTHOR]

Abstract: Background: Recruitment and retention of adolescent research participants presents unique challenges and considerations when conducting epidemiological studies. Purpose: To describe the use of the social networking website in the re-recruitment and tracking of adolescent girls into a follow-up study of the Trial of Activity for Adolescent Girls (TAAG) at the University of Maryland field site. Methods: 730 girls were recruited as 8th graders into TAAG. Re-recruitment efforts were conducted when they were 11th graders (TAAG 2). Traditional methods, including mailings and school visits, were conducted. A TAAG 2 Facebook site was created to search for girls not found through traditional recruitment methods. Chi-square and t-tests were conducted to identify differences in characteristics between those found and “friended” through Facebook and through traditional recruitment methods. Results: There were 175 girls we were unable to locate using traditional recruitment methods. Of these, 78 were found on Facebook, 68 responded to our friend request, and 43 girls (6% of the girls previously recruited) participated in the study. Demographic data were similar for those who friended us on Facebook and traditional methods. 8th grade body mass index and percent body fat were lower for those recruited from Facebook (p =0.03 and 0.04, respectively). Number of daily minutes of moderate-to-vigorous physical activity tended to be lower among the TAAG 2 Facebook friends (19±11 vs 21±11, p =0.06). Conclusions: Loss to follow-up was minimized by contacting potential participants through Facebook. Social networking websites are a promising method to recruit adolescents. [Copyright &y& Elsevier]

Abstract: Obesity disproportionately affects African American adolescents, particularly girls. While ethnically targeted marketing of unhealthful food products contributes to this disparity, it is not known how African Americans perceive the food marketing environment in their communities. Qualitative methods, specifically photovoice and group discussions, were used to understand perceptions of African American adults and teen girls regarding targeted food marketing to adolescent girls. An advisory committee of four students, two faculty, and two parents was formed, who recruited peers to photograph their environments and participate in group discussions to answer “what influences teen girls to eat what they do.” Seven adults and nine teens (all female) participated in the study. Discussions were transcribed, coded, and analyzed with ATLAS.ti to identify common and disparate themes among participants. Results indicated that adults and teens perceived the type of food products, availability of foods, and price to influence the girls’ choices. The girls spoke about products that were highly convenient and tasty as being particularly attractive. The adults reported that advertisements and insufficient nutrition education were also influencers. The teens discussed that the places in which food products were available influenced their choices. Results suggest that the marketing of highly available, convenient food at low prices sell products to teen girls. Future work is needed to better understand the consumer’s perspective on the food and beverage marketing strategies used. [Copyright &y& Elsevier]

Background: This study examines the differences among black, Hispanic, and white adolescent girls in their perceptions surrounding physical activity (PA), including support within the school climate, friend and family social support, and personal enjoyment. Methods: Participants included 1466 sixth-grade girls from 36 middle schools across the United States. Participants were 20% black, 21% Hispanic, 47% white, and 12% of other or mixed races. Multivariate analyses were performed on each scale, adjusting for body mass index and free and reduced-price lunch status. Results: Results showed racial differences on several variables. Black girls, compared with white girls, perceived significantly lower PA enjoyment (p < .001) and teacher support for PA (p = .004). Hispanic girls experienced less PA enjoyment (p = .003) and perceived less support for PA from boys (p = .001) and their families (p = .008) than white girls. Black girls reported significantly higher levels of physical education (PE) enjoyment than did white girls (p = .003). Conclusions: Differences in perceived PA support and enjoyment across race raise questions about why these differences exist and how best to address disparities within interventions. [ABSTRACT FROM AUTHOR]

Social-ecological (SE) models are becoming more widely used in health behavior research. Applying SE models to the design of interventions is challenging because models must be tailor-made for each behavior and population, other theories need to be integrated into multilevel frameworks, and empirical research to guide model development is limited. The purpose of the present paper is to describe a SE framework that guided the intervention and measurement plans for a specific study. The trial of activity for adolescent girls (TAAG) is a multi-center study of interventions to reduce the decline of physical activity in adolescent girls. The TAAG framework incorporates operant learning theory, social cognitive theory, organizational change theory and the diffusion of innovation model in a multi-level model. The explicit and practical model developed for TAAG has already benefited the study and may have elements that can generalize to other health promotion studies. [ABSTRACT FROM AUTHOR]