Effect of vitamin K on vascular health and physical function in older people with vascular disease: a randomised controlled trial

R L Fulton, M. E. T. McMurdo, A Hill, R. J. Abboud, G. P. Arnold, A. D. Struthers, F. Khan, C. Vermeer, M. H. J. Knapen, N. E. A. Drummen, M. D. Witham

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14 Citations (Scopus)

Abstract

BACKGROUND AND AIMS: Vitamin K insufficiency is common and linked to an increased risk of cardiovascular disease and osteoporotic fractures. The aim of this study was to examine whether daily supplementation with oral vitamin K could improve vascular health and physical function in older people with established vascular disease.

METHODS AND RESULTS: A double blind, randomised, placebo-controlled trial. Participants aged ≤ 70 years with a history of vascular disease were randomised to receive 6 months of daily oral 100mcg vitamin K2 (MK7 subtype) or matching placebo with outcomes measured at 0, 3 and 6 months. The primary outcome was between-group difference in endothelial function assessed using flow-mediated dilatation of the brachial artery at 6 months. Secondary outcomes included carotid-radial pulse wave velocity, augmentation index, blood pressure, carotid intima-media thickness, C-reactive protein, B-type natriuretic peptide, cholesterol and desphospho-uncarboxylated matrix Gla protein levels. Handgrip strength and the Short Physical Performance Battery assessed physical function, while postural sway was measured using a 3-dimensional force platform.

RESULTS: 80 participants were randomised, mean age 77 (SD 5) years; 44/80 were male. Vitamin K levels rose in the intervention arm compared to placebo (+48 pg/ml vs -6 pg/ml, p=0.03) at 6 months. Desphospho-uncarboxylated Matrix Gla protein levels fell in the intervention group compared to placebo at 6 months (-130 [SD 117] pmol/L vs +13 [SD 180] pmol/L, p<0.001). No change was seen in endothelial function (between group difference -0.3% [95%CI -1.3 to 0.8], p=0.62). A modest, non-significant improvement in pulse wave velocity was seen in the vitamin K group (-0.8m/s [95%CI -1.8 to 0.3], p=0.15) while all other vascular and physical function outcomes unchanged.

CONCLUSIONS: Six months of vitamin K2 supplementation did not improve markers of vascular health or physical function in older patients with vascular disease.

Original languageEnglish
Pages (from-to)325-33
Number of pages9
JournalJournal of Nutrition, Health and Aging
Volume20
Issue number3
Early online date14 Nov 2015
DOIs
Publication statusPublished - Mar 2016
Externally publishedYes

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    Fulton, R. L., McMurdo, M. E. T., Hill, A., Abboud, R. J., Arnold, G. P., Struthers, A. D., Khan, F., Vermeer, C., Knapen, M. H. J., Drummen, N. E. A., & Witham, M. D. (2016). Effect of vitamin K on vascular health and physical function in older people with vascular disease: a randomised controlled trial. Journal of Nutrition, Health and Aging, 20(3), 325-33. https://doi.org/10.1007/s12603-015-0619-4