Sallis JF, Hovell MF, et al. Distance between homes and exercise facilities related to frequency of exercise among San Diego residents. Public Health Reports. 1990;105:179-185.
For this study, the authors conducted a random sample survey of residents of San Diego, California, to investigate the influence of physical environment on exercise. After adjusting for residents' age, education, and income, the authors found that people who reported exercising three or more times per week had a higher density of pay exercise facilities near their homes. Although it is difficult to establish causation, access to recreation facilities is often suggested as a determinant of physical activity.
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