1. Wannamethee SG, Shaper AG: Physical activity in the prevention of cardiovascular disease: An epidemiological perspective.Sports Medicine. 2001,31:101–114.
2. U.S. Department of Health and Human Services:Physical Activity and Health. Atlanta, GA: Public Health Service, Centers for Disease Control and Prevention, 1996.
3. Friedenreich CM: Physical activity and cancer prevention: From observational to intervention research.Cancer Epidemiology, Biomarkers and Prevention. 2001,10: 287–301.
4. Martinez ME, Giovannucci E, Spiegelman D, et al.: Leisure-time physical activity, body size, and colon cancer in women.Journal of the National Cancer Institute. 1997,89:948–955.
5. Sallis JF, Hovell MF, Hofstetter CR, et al.: Distance between homes and exercise facilities related to frequency of exercise among San Diego residents.Public Health Reports. 1990,105:179–185.