The present evidence indicates a reverse correlation between vitamin D status and blood pressure (BP). The present study determined the effect of oral vitamin D supplementation on BP in patients with elevated BP and vitamin D deficiency.
In this randomized, double-blind, placebo-controlled trial, 42 outpatients with elevated BP and vitamin D deficiency were assigned randomly to two groups: the vitamin D-supplemented group (VDG), who received one capsule containing 50 000 IU of cholecalciferol weekly, and the placebo group (PG), who received one similar capsule containing oral liquid paraffin as placebo for 8 weeks. The systolic (SBP) and diastolic (DBP) blood pressures, mean arterial blood pressure (MAP), pulse pressure, serum 25-hydroxyvitamin D, parathormone, calcium, phosphorus, magnesium, sodium, and potassium were measured before and after the intervention.
In all, 92.7% of the VDG recovered from vitamin D deficiency. At the end of the intervention, the mean SBP and DBP, and the MAP decreased significantly in VDG compared with the PG, whereas at the beginning of the intervention, there was no significant difference between the two groups. The mean changes in SBP (−6.4±5.3 vs. 0.9±3.7 mmHg, PV<0.001), DBP (−2.4±3.7 vs. 1.0±2.7 mmHg, PV=0.003), and MAP (−3.7±3.6 vs. 0.9±2.5 mmHg, PV<0.001) were lower in the VDG than PG.
The findings of the study showed that the weekly administration of 50 000 IU of oral vitamin D for 8 weeks as an adjunct supplement of antihypertensive drugs in patients with vitamin D deficiency could help prevent vitamin D deficiency and aid control of SBP, DBP, and MAP.
aDepartment of Nutrition, Faculty of Health
bDepartment of Internal Medicine
cGeneral Courses Department, Faculty of Medicine, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Correspondence to Hassan Mozaffari-Khosravi, PhD, Department of Nutrition, Faculty of Health, Shahid Sadoughi University of Medical Sciences, Bahonar Square, Central Building, Yazd, 8915875938, Iran Tel: +98 351 7249333; fax: +98 351 7258413; e-mail: email@example.com
Received February 21, 2014
Received in revised form September 14, 2014
Accepted September 16, 2014