The Contribution of the Built Environment to Physical Activity Among Young Women

Physical activity (PA) tends to decline with age, but changes are influenced by individual and contextual factors. Identifying the relative contributions of each may be useful in addressing inactivity. We studied the degree to which changes in the built environment were associated with changes in PA among young women maturing from adolescence to adulthood. We followed a cohort of young women who participated in the Maryland site of the Trial of Activity of Adolescent Girls in 11th grade (ages 16-17 years) and again at ages 22 to 23. Participants wore accelerometers for 1 week in 2009 and in 2015 and answered questionnaires about their daily lives. We found that living closer to mass transit, sports, and recreational facilities was associated with more moderate-to-vigorous physical activity (MVPA). Individual-level factors were strongly associated with MVPA as well.