Walston J, Hadley EC, Ferrucci L, Guralnik JM, Newman AB, Studenski SA, Ershler WB, Harris T, Fried LP. Research agenda for frailty in older adults: toward a better understanding of physiology and etiology: summary from the American Geriatrics Society/National Institute on Aging Research Conference on Frailty in Older Adults. J Am Geriatr Soc. 2006 Jun;54(6):991-1001. doi: 10.1111/j.1532-5415.2006.00745.x. Abellan van Kan G, Rolland YM, Morley JE, Vellas B. Frailty: toward a clinical definition. J Am Med Dir Assoc. 2008 Feb;9(2):71-2. doi: 10.1016/j.jamda.2007.11.005. No abstract available. Bunt S, Steverink N, Olthof J, van der Schans CP, Hobbelen JSM. Social frailty in older adults: a scoping review. Eur J Ageing. 2017 Jan 31;14(3):323-334. doi: 10.1007/s10433-017-0414-7. eCollection 2017 Sep. Gale CR, Westbury L, Cooper C. Social isolation and loneliness as risk factors for the progression of frailty: the English Longitudinal Study of Ageing. Age Ageing. 2018 May 1;47(3):392-397. doi: 10.1093/ageing/afx188. Petrusevski C, Choo S, Wilson M, MacDermid J, Richardson J. Interventions to address sedentary behaviour for older adults: a scoping review. Disabil Rehabil. 2021 Oct;43(21):3090-3101. doi: 10.1080/09638288.2020.1725156. Epub 2020 Feb 14. Chastin S, Gardiner PA, Harvey JA, Leask CF, Jerez-Roig J, Rosenberg D, Ashe MC, Helbostad JL, Skelton DA. Interventions for reducing sedentary behaviour in community-dwelling older adults. Cochrane Database Syst Rev. 2021 Jun 25;6(6):CD012784. doi: 10.1002/14651858.CD012784.pub2. Owen N, Healy GN, Matthews CE, Dunstan DW. Too much sitting: the population health science of sedentary behavior. Exerc Sport Sci Rev. 2010 Jul;38(3):105-13. doi: 10.1097/JES.0b013e3181e373a2. Blodgett J, Theou O, Kirkland S, Andreou P, Rockwood K. The association between sedentary behaviour, moderate-vigorous physical activity and frailty in NHANES cohorts. Maturitas. 2015 Feb;80(2):187-91. doi: 10.1016/j.maturitas.2014.11.010. Epub 2014 Nov 25. Katzmarzyk PT, Church TS, Craig CL, Bouchard C. Sitting time and mortality from all causes, cardiovascular disease, and cancer. Med Sci Sports Exerc. 2009 May;41(5):998-1005. doi: 10.1249/MSS.0b013e3181930355. MAPping Sedentary Behaviour (MAPS-B) in Older Adults: A Mix-methods Longitudinal Study