World Health Organization. International classification of functioning, disability, and health. Geneva: World Health Organization; 2005.
Google Scholar
Van Ancum JM, van Schooten KS, Jonkman NH, Huijben B, van Lummel RC, Meskers CGM, et al. Gait speed assessed by a 4-m walk test is not representative of daily-life gait speed in community-dwelling adults. Maturitas. 2019;121:28–34.
Article
Google Scholar
Giannouli E, Bock O, Mellone S, Zijlstra W. Mobility in old age: capacity is not performance. Biomed Res Int. 2016;2016:3261567.
Article
Google Scholar
Rapp K, Klenk J, Benzinger P, Franke S, Denkinger MD, Peter R. Physical performance and daily walking duration: associations in 1271 women and men aged 65-90 years. Aging Clin Exp Res. 2012;24(5):455–60.
PubMed
Google Scholar
Hillel I, Gazit E, Nieuwboer A, Avanzino L, Rochester L, Cereatti A, et al. Is every-day walking in older adults more analogous to dual-task walking or to usual walking? Elucidating the gaps between gait performance in the lab and during 24/7 monitoring. Eur Rev Aging Phys Act. 2019;16(1):6.
Article
Google Scholar
Stellmann JP, Neuhaus A, Götze N, Briken S, Lederer C, Schimpl M, et al. Ecological validity of walking capacity tests in multiple sclerosis. PLoS One. 2015;10(4):e0123822.
Article
CAS
Google Scholar
Suominen H. Ageing and maximal physical performance. Eur Rev Aging Phys Act. 2011;8(1):37–42.
Article
Google Scholar
Hortobagyi T, Mizelle C, Beam S, DeVita P. Old adults perform activities of daily living near their maximal capabilities. J Gerontol A Biol Sci Med Sci. 2003;58(5):M453–60.
Article
Google Scholar
Pincheira PA, Stenroth L, Avela J, Cronin NJ. Individual leg muscle contributions to the cost of walking: effects of age and walking speed. J Aging Phys Act. 2017;25(2):295–304.
Article
Google Scholar
Rockwood K. Frailty and its definition: a worthy challenge. J Am Geriatr Soc. 2005;53(6):1069–70.
Article
Google Scholar
Ferrucci L, Guralnik JM, Studenski S, Fried LP, Cutler GB Jr, Walston JD, et al. Designing randomized, controlled trials aimed at preventing or delaying functional decline and disability in frail, older persons: a consensus report. J Am Geriatr Soc. 2004;52(4):625–34.
Article
Google Scholar
Schwenk M, Mohler J, Wendel C, D'Huyvetter K, Fain M, Taylor-Piliae R, et al. Wearable sensor-based in-home assessment of gait, balance, and physical activity for discrimination of frailty status: baseline results of the Arizona frailty cohort study. Gerontology. 2015;61(3):258–67.
Article
Google Scholar
Mohler MJ, Wendel CS, Taylor-Piliae RE, Toosizadeh N, Najafi B. Motor performance and physical activity as predictors of prospective falls in community-dwelling older adults by frailty level: application of wearable technology. Gerontology. 2016;62(6):654–64.
Article
Google Scholar
Muchna A, Najafi B, Wendel CS, Schwenk M, Armstrong DG, Mohler J. Foot problems in older adults associations with incident falls, frailty syndrome, and sensor-derived gait, balance, and physical activity measures. J Am Podiatr Med Assoc. 2018;108(2):126–39.
Article
Google Scholar
Fried LP, Tangen CM, Walston J, Newman AB, Hirsch C, Gottdiener J, et al. Frailty in older adults: evidence for a phenotype. J Gerontol A Biol Sci Med Sci. 2001;56(3):M146–56.
Article
CAS
Google Scholar
Taylor HL, Jacobs DR Jr, Schucker B, Knudsen J, Leon AS, Debacker G. A questionnaire for the assessment of leisure time physical activities. J Chronic Dis. 1978;31(12):741–55.
Article
CAS
Google Scholar
Eaton W, Smith C, Ybarra M, Muntaner C, Tien A. Center for epidemiologic studies depression scale: review and revision. In: Maruish M, editor. The use of psychological testing for treatment planning and outcomes assessment. 3rd ed. New Jersey: Lawrence Erlbaum Associates; 2004. p. 363–77.
Google Scholar
Najafi B, Armstrong DG, Mohler J. Novel wearable technology for assessing spontaneous daily physical activity and risk of falling in older adults with diabetes. J Diabetes Sci Technol. 2013;7(5):1147–60.
Article
Google Scholar
Najafi B, Aminian K, Paraschiv-Ionescu A, Loew F, Bula CJ, Robert P. Ambulatory system for human motion analysis using a kinematic sensor: monitoring of daily physical activity in the elderly. IEEE Trans Biomed Eng. 2003;50(6):711–23.
Article
Google Scholar
Najafi B, Aminian K, Loew F, Blanc Y, Robert PA. Measurement of stand-sit and sit-stand transitions using a miniature gyroscope and its application in fall risk evaluation in the elderly. IEEE Trans Biomed Eng. 2002;49(8):843–51.
Article
Google Scholar
Cesari M, Kritchevsky SB, Penninx BW, Nicklas BJ, Simonsick EM, Newman AB, et al. Prognostic value of usual gait speed in well-functioning older people--results from the health, aging and body composition study. J Am Geriatr Soc. 2005;53(10):1675–80.
Article
Google Scholar
Montero-Odasso M, Schapira M, Soriano ER, Varela M, Kaplan R, Camera LA, et al. Gait velocity as a single predictor of adverse events in healthy seniors aged 75 years and older. J Gerontol A Biol Sci Med Sci. 2005;60(10):1304–9.
Article
Google Scholar
Rydwik E, Bergland A, Forsen L, Frandin K. Investigation into the reliability and validity of the measurement of elderly people's clinical walking speed: a systematic review. Physiother Theory Pract. 2012;28(3):238–56.
Article
CAS
Google Scholar
Aminian K, Najafi B, Bula C, Leyvraz PF, Robert P. Spatio-temporal parameters of gait measured by an ambulatory system using miniature gyroscopes. J Biomech. 2002;35(5):689–99.
Article
Google Scholar
Aminian K, Trevisan C, Najafi B, Dejnabadi H, Frigo C, Pavan E, et al. Evaluation of an ambulatory system for gait analysis in hip osteoarthritis and after total hip replacement. Gait Posture. 2004;20(1):102–7.
Article
CAS
Google Scholar
Hayes AF, Rockwood NJ. Regression-based statistical mediation and moderation analysis in clinical research: observations, recommendations, and implementation. Behav Res Ther. 2017;98:39–57.
Article
Google Scholar
van Lummel RC, Walgaard S, Pijnappels M, Elders PJM, Garcia-Aymerich J, van Dieën JH, et al. Physical performance and physical activity in older adults: associated but separate domains of physical function in old age. PLoS One. 2015;10(12):e0144048.
Article
Google Scholar
Egerton T, Paterson K, Helbostad JL. The association between gait characteristics and ambulatory physical activity in older people: a cross-sectional and longitudinal observational study using generation 100 data. J Aging Phys Act. 2017;25(1):10–9.
Article
Google Scholar
Umstattd Meyer MR, Janke MC, Beaujean AA. Predictors of older adults’ personal and community mobility: using a comprehensive theoretical mobility framework. Gerontologist. 2014;54(3):398–408.
Article
Google Scholar
Webber SC, Porter MM, Menec VH. Mobility in older adults: a comprehensive framework. Gerontologist. 2010;50(4):443–50.
Article
Google Scholar
Blodgett J, Theou O, Kirkland S, Andreou P, Rockwood K. Frailty in NHANES: comparing the frailty index and phenotype. Arch Gerontol Geriatr. 2015;60(3):464–70.
Article
Google Scholar
Bowerman BL, O'Connel RT. Linear statistical models: an applied approach. 2nd ed. Belmont: Duxbury; 1990.
Google Scholar
Rodriguez-Manas L, Feart C, Mann G, Vina J, Chatterji S, Chodzko-Zajko W, et al. Searching for an operational definition of frailty: a Delphi method based consensus statement: the frailty operative definition-consensus conference project. J Gerontol A Biol Sci Med Sci. 2013;68(1):62–7.
Article
Google Scholar