Marcello Maggio1, Francesca De Vita, Fulvio Lauretani, Gian Paolo Ceda, Elena Volpi, Francesco Giallauria, Giuseppe De Cicco, Chiara Cattabiani, Håkan Melhus, Karl Michaëlsson, Tommy Cederholm, Lars Lind. 1. Geriatric Rehabilitation Department (M.M., F.D.V., F.L., G.P.C.), University Hospital of Parma, 43126 Parma, Italy; Department of Clinical and Experimental Medicine (M.M., G.P.C.), Section of Geriatrics, University of Parma, 43126 Parma, Italy; Department of Internal Medicine (E.V.), Division of Geriatrics, and Sealy Center on Aging, University of Texas Medical Branch, Galveston, Galveston, Texas 77555-0264; Department of Clinical Medicine, Cardiovascular and Immunological Sciences (F.G.), University of Naples Federico II, 80138 Napoli, Italy; Cardiac Surgery Unit (G.D.C.), Community Hospital of Brescia, 25123 Brescia, Italy; Azienda USL Piacenza (C.C.), 23121 Piacenza, Italy; Department of Medical Sciences (H.M.), Uppsala University, 751 85 Uppsala, Sweden; Department of Surgical Sciences (K.M.), Uppsala University, 751 85 Uppsala, Sweden; Department of Medicine (T.C.), Uppsala University Hospital, 751 85 Uppsala, Sweden; and Department of Public Health and Caring Sciences (L.L.), Section of Clinical Nutrition and Metabolism, Uppsala University, 751 85 Uppsala, Sweden.
Abstract
CONTEXT: Vitamin D plays a role in a wide range of extraskeletal processes, including vascular function. Endothelial dysfunction is a predictor of cardiovascular disease, especially in older subjects. However, the relationship between vitamin D levels and indexes of endothelial vasodilation has never been fully addressed in older individuals. OBJECTIVE: The objective of this study was to examine the association between vitamin D and endothelial function in a large community-based sample of older subjects. METHODS: This cross-sectional study involved 852 community-dwelling men and women aged 70 years from the Prospective Study of the Vasculature in Uppsala Seniors (PIVUS), with complete data on vascular function and 25-hydroxyvitamin D. We evaluated endothelium-dependent vasodilation by an invasive forearm technique with acetylcholine, endothelium-independent vasodilation by sodium nitroprussiate, flow-mediated vasodilation, and the pulse wave analysis (reflectance index). Vitamin D levels were measured by chemiluminescence. We used multivariate regression models adjusted for body mass index (model 1) and for multiple confounders (high-sensitivity C-reactive protein, insulin, total cholesterol, high-density lipoprotein-cholesterol, low-density lipoprotein-cholesterol, smoking, sex hormones, season of blood collection, hypertension, diabetes, cardiovascular medications and diseases, statin usage, plasma calcium and calcium intake, PTH, physical exercise, liver and kidney function tests, albumin; model 2). RESULTS: In women, but not in men, vitamin D levels were positively associated with endothelium-independent vasodilation in both model 1 (β ± SE = 1.41 ± 0.54; P = .001), and model 2 (β ± SE = 2.01 ± 0.68; P = .003).We found no significant relationship between vitamin D levels and endothelium-dependent vasodilation, flow-mediated vasodilation, and reflectance index in both sexes. CONCLUSIONS: In older women, but not in men, vitamin D is positively and independently associated with EIDV.
CONTEXT: Vitamin D plays a role in a wide range of extraskeletal processes, including vascular function. Endothelial dysfunction is a predictor of cardiovascular disease, especially in older subjects. However, the relationship between vitamin D levels and indexes of endothelial vasodilation has never been fully addressed in older individuals. OBJECTIVE: The objective of this study was to examine the association between vitamin D and endothelial function in a large community-based sample of older subjects. METHODS: This cross-sectional study involved 852 community-dwelling men and women aged 70 years from the Prospective Study of the Vasculature in Uppsala Seniors (PIVUS), with complete data on vascular function and 25-hydroxyvitamin D. We evaluated endothelium-dependent vasodilation by an invasive forearm technique with acetylcholine, endothelium-independent vasodilation by sodium nitroprussiate, flow-mediated vasodilation, and the pulse wave analysis (reflectance index). Vitamin D levels were measured by chemiluminescence. We used multivariate regression models adjusted for body mass index (model 1) and for multiple confounders (high-sensitivity C-reactive protein, insulin, total cholesterol, high-density lipoprotein-cholesterol, low-density lipoprotein-cholesterol, smoking, sex hormones, season of blood collection, hypertension, diabetes, cardiovascular medications and diseases, statin usage, plasma calcium and calcium intake, PTH, physical exercise, liver and kidney function tests, albumin; model 2). RESULTS: In women, but not in men, vitamin D levels were positively associated with endothelium-independent vasodilation in both model 1 (β ± SE = 1.41 ± 0.54; P = .001), and model 2 (β ± SE = 2.01 ± 0.68; P = .003).We found no significant relationship between vitamin D levels and endothelium-dependent vasodilation, flow-mediated vasodilation, and reflectance index in both sexes. CONCLUSIONS: In older women, but not in men, vitamin D is positively and independently associated with EIDV.
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