Lee IM, Shiroma EJ, Lobelo F, Puska P, Blair SN, Katzmarzk PT: Effect of physical inactivity on major non-communicable diseases worldwide: an analysis of burden of disease and life expectancy. Lancet. 2012, 380: 219-229. 10.1016/S0140-6736(12)61031-9.
Craig R, Mindell J, Hirani V: Health Survey for England 2008. Physical Activity and Fitness. Summary of Key findings. 2009, London: The Health and Social Care Information Centre
Baptista F, Santos DA, Silva AM, Mota J, Santos R, Vale S, Ferreira JP, Raimundo AM, Moreira H, Sardinha LB: Prevalence of the Portuguese population attaining sufficient physical activity. Med Sci Sports Exerc. 2012, 44: 466-473. 10.1249/MSS.0b013e318230e441. doi:10.1249/MSS.0b013e318230e441
Colley RC, Garriguet D, Janssen I, Craig CL, Clarke J, Tremblay MS: Physical activity of Canadian adults: accelerometer results from the 2007 to 2009 Canadian Health Measures Survey. Health Rep. 2011, 22: 7-14.
Troiano RP, Berrigan D, Dodd KW, Masse LC, Tilert T, McDowell M: Physical activity in the United States measured by accelerometer. Med Sci Sports Exerc. 2008, 40: 181-188. 10.1249/mss.0b013e31815a51b3.
Ashe MC, Miller WC, Eng JJ, Noreau L: Older adults, chronic disease and leisure-time physical activity. Gerontology. 2009, 55: 64-72. 10.1159/000141518.
Knuth AG, Bacchieri G, Victora CG, Hallal PC: Changes in physical activity among Brazilian adults over a 5-year period. J Epidemiol Community Health. 2010, 64: 591-595. 10.1136/jech.2009.088526.
Chief Medical Officers of England, Scotland, Wales and Northern Ireland: Start Active, Stay Active. A report on physical activity for health from the four home countries’ Chief Medical Officers. 2011, London: Crown
Nelson ME, Rejeski J, Blair SN, Duncan PW, Judge JO, King AC, Macera CA, Castaneda-Sceppa C: Physical Activity and Public Health in Older Adults: Recommendation From the American College of Sports Medicine and the American Heart Association. Circulation. 2007, 116: 1094-1105.
DiPietro L: Physical Activity in Aging: Changes in Patterns and Their Relationship to Health and Function. J Gerontol A: Biol Med Sci. 2001, 56: 13-22. 10.1093/gerona/56.suppl_2.13.
Washburn RA: Assessment of physical activity in older adults. Res Q Exerc Sport. 2000, 71: S79-S88.
Physical Activity Guidelines Advisory Committee: Physical Activity Guidelines Advisory Committee Report. 2008, Washington, DC: US, Department of Health and Human Services
Evenson KR, Buchner DM, Morland KB: Objective measurement of physical activity and sedentary behavior among US adults aged 60 years or older. Prev Chronic Dis. 2012, 9: E26-
Booth ML, Owen N, Bauman A, Clavisi O, Leslie E: Social-cognitive and perceived environment influences associated with physical activity in older Australians. Prev Med. 2000, 31: 15-22. 10.1006/pmed.2000.0661.
Davis MG, Fox KR, Hillsdon M, Sharp DJ, Coulson JC, Thompson JL: Objectively measured physical activity in a diverse sample of older urban UK adults. Med Sci Sports Exerc. 2011, 43: 647-654.
Fox KR, Hillsdon M, Sharp D, Cooper AR, Coulson JC, Davis M, Harris R, McKenna J, Narici M, Stathi A, Thompson JL: Neighbourhood deprivation and physical activity in UK older adults. Health Place. 2011, 17: 633-640. 10.1016/j.healthplace.2011.01.002.
Harris TJ, Owen CG, Victor CR, Adams R, Cook DG: What factors are associated with physical activity in older people, assessed objectively by accelerometry?. Br J Sports Med. 2009, 43: 442-450. 10.1136/bjsm.2008.048033.
Walker M, Whincup PH, Shaper AG: The British Regional Heart Study 1975–2004. Int J Epidemiol. 2004, 33: 1185-1192. 10.1093/ije/dyh295.
Lawlor DA, Bedford C, Taylor M, Ebrahim S: Geographical variation in cardiovascular disease, risk factors, and their control in older women: British Women’s Heart and Health Study. J Epidemiol Community Health. 2003, 57: 134-140. 10.1136/jech.57.2.134.
Choi L, Liu Z, Matthews C, Buchowski MS: Physical Activity: Process Physical Activity Accelerometer Data. 2011, Nashville, TN: Leena Choi
Hart TL, Swartz AM, Cashin SE, Strath SJ: How many days of monitoring predict physical activity and sedentary behaviour in older adults?. Int J Behav Nutr Phys Act. 2011, 8: 62-10.1186/1479-5868-8-62.
Copeland JL, Esliger DW: Accelerometer assessment of physical activity in active, healthy older adults. J Aging Phys Act. 2009, 17: 17-30.
Freedson PS, Melanson E, Sirard J: Calibration of the Computer Science and Applications, Inc. accelerometer. Med Sci Sports Exerc. 1998, 30: 777-781. 10.1097/00005768-199805000-00021.
Van Marwijk HW, Wallace P, De Bock GH, Hermans J, Kaptein AA, Mulder JD: Evaluation of the feasibility, reliability and diagnostic value of shortened versions of the geriatric depression scale. Br J Gen Pract. 1995, 45: 195-199.
Lubben J, Blozik E, Gillmann G, Iliffe S, Von Renteln KW, Beck JC, Stuck AE: Performance of an abbreviated version of the Lubben Social Network Scale among three European community-dwelling older adult populations. Gerontologist. 2006, 46: 503-513. 10.1093/geront/46.4.503.
Resnick B, Jenkins LS: Testing the Reliability and Validity of the Self-Efficacy for Exercise Scale. Nurs Res. 2000, 49: 154-159. 10.1097/00006199-200005000-00007.
Tucker JM, Welk GJ, Beyler NK: Physical activity in U.S.: adults compliance with the Physical Activity Guidelines for Americans. Am J Prev Med. 2011, 40: 454-461. 10.1016/j.amepre.2010.12.016.
Gennuso KP, Gangnon RE, Matthews CE, Thraen-Borowski KM, Colbert LH: Sedentary Behavior, Physical Activity, and Markers of Health in Older Adults. Med Sci Sports Exerc. 2013, 45 (8): 1493-1500. 10.1249/MSS.0b013e318288a1e5. doi:10.1249/MSS.0b013e318288a1e5.
Gibala MJ, Little JP, MacDonald MJ, Hawley JA: Physiological adaptations to low-volume, high-intensity interval training in health and disease. J Physiol. 2012, 590: 1077-1084. 10.1113/jphysiol.2011.224725.
Chipperfield JG, Newall NE, Chuchmach LP, Swift AU, Haynes TL: Differential Determinants of Men’s and Women’s Everyday Physical Activity in Later Life. J Gerontol B Psychol Sci Soc Sci. 2008, 63: S211-S218. 10.1093/geronb/63.4.S211.
Booth ML, Bauman A, Owen N, Gore CJ: Physical activity preferences, preferred sources of assistance, and perceived barriers to increased activity among physically inactive Australians. Prev Med. 1997, 26: 131-137. 10.1006/pmed.1996.9982.