Adams JS, Hewison M. Update in vitamin D. J Clin Endocrinol Metab. 2010;95:471–8.
Holick MF. Vitamin D deficiency. N Engl J Med. 2007;357:266–81.
De Rui M, Toffanello ED, Veronese N, Zambon S, Bolzetta F, Sartori L, et al. Vitamin D deficiency and leisure time activities in the elderly: are all pastimes the same? PLoS One. 2014;9:e94805.
Christodoulou S, Goula T, Ververidis A, Drosos G. Vitamin D and bone disease. Biomed Res Int. 2013;2013:396541.
Christakos S, Hewison M, Gardner DG, Wagner CL, Sergeev IN, Rutten E, et al. Vitamin D: beyond bone. Ann N Y Acad Sci. 2013;1287:45–58.
Holick MF, Chen TC. Vitamin D deficiency: a worldwide problem with health consequences. Am J Clin Nutr. 2008;87:1080s–6s.
Hoogendijk WJ, Lips P, Dik MG, Deeg DJ, Beekman AT, Penninx BW. Depression is associated with decreased 25-hydroxyvitamin D and increased parathyroid hormone levels in older adults. Arch Gen Psychiatry. 2008;65:508–12.
Rafiq R, Swart KM, van Schoor NM, Deeg DJ, Lips P, de Jongh RT. Associations of serum 25-hydroxyvitamin D concentrations with quality of life and self-rated health in an older population. J Clin Endocrinol Metab. 2014;99(9):3136–43.
Chao YS, Ekwaru JP, Ohinmaa A, Griener G, Veugelers PJ. Vitamin D and health-related quality of life in a community sample of older Canadians. Qual Life Res. 2014;23(9):2569–75.
Witham MD, Crighton LJ, Gillespie ND, Struthers AD, McMurdo ME. The effects of vitamin D supplementation on physical function and quality of life in older patients with heart failure: a randomized controlled trial. Circ Heart Fail. 2010;3:195–201.
Chlebowski RT, Johnson KC, Kooperberg C, Pettinger M, Wactawski-Wende J, Rohan T, et al. Calcium plus vitamin D supplementation and the risk of breast cancer. J Natl Cancer Inst. 2008;100:1581–91.
Hoffmann MR, Senior PA, Mager DR. Vitamin D supplementation and health-related quality of life: a systematic review of the literature. J Acad Nutr Diet. 2015;115(3):406–18.
Felson DT. Clinical practice. Osteoarthritis of the knee. N Engl J Med. 2006;354:841–8.
Vos T, Flaxman AD, Naghavi M, Lozano R, Michaud C, Ezzati M, et al. Years lived with disability (YLDs) for 1160 sequelae of 289 diseases and injuries 1990–2010: a systematic analysis for the Global Burden of Disease Study 2010. Lancet. 2012;380:2163–96.
Shane Anderson A, Loeser RF. Why is osteoarthritis an age-related disease? Best Pract Res Clin Rheumatol. 2010;24:15–26.
YS J, AJ S. Health status, health behavior, and quality of life in the elderly with osteoarthritis. Nursing Science. 2011;23:23–33.
Cao Y, Winzenberg T, Nguo K, Lin J, Jones G, Ding C. Association between serum levels of 25-hydroxyvitamin D and osteoarthritis: a systematic review. Rheumatology (Oxford). 2013;52:1323–34.
Moon KH. New view on the initial development site and radiographic classification system of osteoarthritis of the knee based on radiographic analysis. Int J Biomed Sci. 2012;8:233–43.
Dahaghin S, Bierma-Zeinstra SM, Ginai AZ, Pols HA, Hazes JM, Koes BW. Prevalence and pattern of radiographic hand osteoarthritis and association with pain and disability (the Rotterdam study). Ann Rheum Dis. 2005;64:682–7.
Schiphof D, Boers M, Bierma-Zeinstra SM. Differences in descriptions of Kellgren and Lawrence grades of knee osteoarthritis. Ann Rheum Dis. 2008;67:1034–6.
Rabin R, de Charro F. EQ-5D: a measure of health status from the EuroQol Group. Ann Med. 2001;33:337–43.
Prevention and management of osteoporosis. World Health Organ Tech Rep Ser. 2003;921:1–164.
Schiller A, Apetrii M, Onofriescu M, Siriopol D, Veisa G, Schiller O, et al. Prognostic significance of 25-hydroxivitamin D entirely explained by a higher comorbidity burden: experience from a South-Eastern European dialysis cohort. Hemodial Int. 2015;19(2):249–55.
Laslett LL, Quinn S, Burgess JR, Parameswaran V, Winzenberg TM, Jones G, et al. Moderate vitamin D deficiency is associated with changes in knee and hip pain in older adults: a 5-year longitudinal study. Ann Rheum Dis. 2014;73:697–703.
Schoenmakers I, Goldberg GR, Prentice A. Abundant sunshine and vitamin D deficiency. Br J Nutr. 2008;99:1171–3.
Muller-Nordhorn J, Muckelbauer R, Englert H, Grittner U, Berger H, Sonntag F, et al. Longitudinal association between body mass index and health-related quality of life. PLoS One. 2014;9:e93071.
Anand S, Kaysen GA, Chertow GM, Johansen KL, Grimes B, Dalrymple LS, et al. Vitamin D deficiency, self-reported physical activity and health-related quality of life: the Comprehensive Dialysis Study. Nephrol Dial Transplant. 2011;26:3683–8.
Basaran S, Guzel R, Coskun-Benlidayi I, Guler-Uysal F. Vitamin D status: effects on quality of life in osteoporosis among Turkish women. Qual Life Res. 2007;16:1491–9.
Ulitsky A, Ananthakrishnan AN, Naik A, Skaros S, Zadvornova Y, Binion DG, et al. Vitamin D deficiency in patients with inflammatory bowel disease: association with disease activity and quality of life. JPEN J Parenter Enteral Nutr. 2011;35:308–16.
Holmes EW, Garbincius J, McKenna KM. Analytical variability among methods for the measurement of 25-hydroxyvitamin D: still adding to the noise. Am J Clin Pathol. 2013;140:550–60.
Holick MF. Vitamin D status: measurement, interpretation, and clinical application. Ann Epidemiol. 2009;19:73–8.
Kwan Tat S, Lajeunesse D, Pelletier JP, Martel-Pelletier J. Targeting subchondral bone for treating osteoarthritis: what is the evidence? Best Pract Res Clin Rheumatol. 2010;24:51–70.
Bischoff-Ferrari HA, Dawson-Hughes B, Willett WC, Staehelin HB, Bazemore MG, Zee RY, et al. Effect of Vitamin D on falls: a meta-analysis. Jama. 2004;291:1999–2006.
Bischoff-Ferrari HA, Willett WC, Wong JB, Giovannucci E, Dietrich T, Dawson-Hughes B. Fracture prevention with vitamin D supplementation: a meta-analysis of randomized controlled trials. Jama. 2005;293:2257–64.
Barker T, Henriksen VT, Rogers VE, Aguirre D, Trawick RH, Lynn Rasmussen G, et al. Vitamin D deficiency associates with gamma-tocopherol and quadriceps weakness but not inflammatory cytokines in subjects with knee osteoarthritis. Redox Biol. 2014;2:466–74.
Rantanen T. Muscle strength, disability and mortality. Scand J Med Sci Sports. 2003;13:3–8.
Takata Y, Ansai T, Soh I, Awano S, Yoshitake Y, Kimura Y, et al. Quality of life and physical fitness in an 85-year-old population. Arch Gerontol Geriatr. 2010;50:272–6.
Al-Johani AH, Kachanathu SJ, Ramadan Hafez A, Al-Ahaideb A, Algarni AD, Meshari Alroumi A, et al. Comparative study of hamstring and quadriceps strengthening treatments in the management of knee osteoarthritis. J Phys Ther Sci. 2014;26:817–20.
Reid KF, Callahan DM, Carabello RJ, Phillips EM, Frontera WR, Fielding RA. Lower extremity power training in elderly subjects with mobility limitations: a randomized controlled trial. Aging Clin Exp Res. 2008;20:337–43.
Koopman FS, Beelen A, Gerrits KH, Bleijenberg G, Abma TA, de Visser M, et al. Exercise therapy and cognitive behavioural therapy to improve fatigue, daily activity performance and quality of life in postpoliomyelitis syndrome: the protocol of the FACTS-2-PPS trial. BMC Neurol. 2010;10:8.
Skalska A, Galas A, Grodzicki T. 25-hydroxyvitamin D and physical and cognitive performance in older people with chronic conditions. Pol Arch Med Wewn. 2012;122:162–9.
Hajduk AM, Lemon SC, McManus DD, Lessard DM, Gurwitz JH, Spencer FA, et al. Cognitive impairment and self-care in heart failure. Clin Epidemiol. 2013;5:407–16.
Van Schependom J, D’Hooghe MB, De Schepper M, Cleynhens K, D’Hooge M, Haelewyck MC, et al. Relative contribution of cognitive and physical disability components to quality of life in MS. J Neurol Sci. 2014;336:116–21.
van Dijk GM, Veenhof C, Lankhorst GJ, Dekker J. Limitations in activities in patients with osteoarthritis of the hip or knee: the relationship with body functions, comorbidity and cognitive functioning. Disabil Rehabil. 2009;31:1685–91.
Costan AR, Vulpoi C, Mocanu V. Vitamin D fortified bread improves pain and physical function domains of quality of life in nursing home residents. J Med Food. 2014;17:625–31.
Jimenez-Redondo S, Beltran de Miguel B, Gavidia Banegas J, GuzmanMercedes L, Gomez-Pavon J, Cuadrado Vives C. Influence of nutritional status on health-related quality of life of non-institutionalized older people. J Nutr Health Aging. 2014;18:359–64.
Le Goaziou MF, Contardo G, Dupraz C, Martin A, Laville M, Schott-Pethelaz AM. Risk factors for vitamin D deficiency in women aged 20–50 years consulting in general practice: a cross-sectional study. Eur J Gen Pract. 2011;17:146–52.
Ohta H, Uemura Y, Nakamura T, Fukunaga M, Ohashi Y, Hosoi T, et al. Serum 25-hydroxyvitamin D level as an independent determinant of quality of life in osteoporosis with a high risk for fracture. Clin Ther. 2014;36:225–35.