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Activity space metrics not associated with sociodemographic variables, diet or health outcomes in the Seattle Obesity
Adam Drewnowski1, Anju Aggarwal1, Chelsea M Rose1
1Center for Public Health Nutrition, 1107 NE 45th St, University of Washington, Seattle, WA 98105, United States.
Background:
Activity spaces (AS), captured using GPS tracking devices, are measures of dynamic exposure to the built environment (BE).
Methods:
Seven days of Global Positioning Systems (GPS) tracking data were obtained for 433 adult participants in the Seattle Obesity Study (SOS II). Heights and weights were measured. Dietary intakes from a food frequency questionnaire were used to calculate Healthy Eating Index (HEI 2010) scores. Linear regression analyses examined associations between AS measures: daily route length, convex hull, and radius of gyration, and diet quality and health outcomes, adjusting for covariates.
Results:
AS measures did not vary by age, gender, race/ethnicity, or socioeconomic status. AS measures were not associated with diet quality or with self-reported obesity or diabetes. One AS measure, route length (in miles), was associated with being employed, living in the suburbs, and with distance and time commuting to work.
Conclusion:
Spatial mobility studies based on GPS tracking of environmental exposure need to demonstrate a link to relevant health outcomes.
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