High-Dose versus Low-Dose Vitamin D Supplementation and Arterial Stiffness among Individuals with Prehypertension and Vitamin D Deficiency

Dis Markers. 2015;2015:918968. doi: 10.1155/2015/918968. Epub 2015 Sep 16.

Abstract

Introduction: Vitamin D deficiency is associated with the onset and progression of hypertension and cardiovascular disease (CVD). However, mechanisms underlying vitamin D deficiency-mediated increased risk of CVD remain unknown. We sought to examine the differential effect of high-dose versus low-dose vitamin D supplementation on markers of arterial stiffness among ~40 vitamin D deficient adults with prehypertension.

Methods: Participants were randomized to high-dose (4000 IU/d) versus low-dose (400 IU/d) oral vitamin D3 for 6 months. 24 hr ambulatory blood pressure (BP), carotid-femoral pulse wave velocity, and pulse wave analyses were obtained at baseline and after 6 months of vitamin D supplementation.

Results: There were no changes in resting BP or pulse wave velocity over 6 mo regardless of vitamin D dose (all p > 0.202). High-dose vitamin D decreased augmentation index and pressure by 12.3 ± 5.3% (p = 0.047) and 4.0 ± 1.5 mmHg (p = 0.02), respectively. However, these decreases in arterial stiffness were not associated with increases in serum 25-hydroxyvitamin D over 6 mo (p = 0.425).

Conclusion: High-dose vitamin D supplementation appears to lower surrogate measures of arterial stiffness but not indices of central pulse wave velocity. Clinical Trial Registration. This trial is registered with www.clinicaltrials.gov (Unique Identifier: NCT01240512).

Publication types

  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Blood Pressure
  • Female
  • Humans
  • Male
  • Middle Aged
  • Prehypertension / drug therapy*
  • Prehypertension / etiology
  • Pulse Wave Analysis
  • Vascular Stiffness*
  • Vitamin D / administration & dosage*
  • Vitamin D / therapeutic use
  • Vitamin D Deficiency / complications
  • Vitamin D Deficiency / drug therapy*
  • Vitamins / administration & dosage*
  • Vitamins / therapeutic use

Substances

  • Vitamins
  • Vitamin D

Associated data

  • ClinicalTrials.gov/NCT01240512