Vitamin D and Vascular Health in Children

This study is currently recruiting participants. (see Contacts and Locations)
Verified December 2014 by University of Pittsburgh
National Heart, Lung, and Blood Institute (NHLBI)
Information provided by (Responsible Party):
Kumaravel Rajakumar, University of Pittsburgh Identifier:
First received: February 20, 2013
Last updated: December 1, 2014
Last verified: December 2014

February 20, 2013
December 1, 2014
August 2013
August 2017   (final data collection date for primary outcome measure)
brachial artery flow-mediated dilation (FMD) [ Time Frame: 6 months ] [ Designated as safety issue: No ]
measure of vascular endothelial function
Same as current
Complete list of historical versions of study NCT01797302 on Archive Site
  • pulse-wave velocity (PWV) [ Time Frame: 6 months ] [ Designated as safety issue: No ]
    measure of arterial stiffness
  • fasting glucose/fasting insulin ratio [ Time Frame: 6 months ] [ Designated as safety issue: No ]
    Homeostasis Model of Assessment - Insulin Resistance (HOMA-IR) as a surrogate estimate of insulin sensitivity
Same as current
  • blood pressure, waist circumference, HDL cholesterol, triglycerides, and fasting blood glucose [ Time Frame: 6 months ] [ Designated as safety issue: No ]
    components of metabolic syndrome
  • inflammatory markers [ Time Frame: 6 months ] [ Designated as safety issue: No ]
  • adipokines [ Time Frame: 6 months ] [ Designated as safety issue: No ]
  • nitric oxide metabolites [ Time Frame: 6 months ] [ Designated as safety issue: No ]
Same as current
Vitamin D and Vascular Health in Children
Vitamin D and Vascular Function in Obese Children

In this study, we will test the central hypothesis that enhancement of vitamin D status in obese and overweight children will improve their vascular health and their cardiovascular disease (CVD) and metabolic syndrome risk profile.

Our primary objective is to determine, in obese and overweight children aged 10 to 18 years with vitamin D deficiency (defined as serum 25-hydroxyvitamin D <20 ng/mL), the efficacy of enhanced vitamin D3 supplementation in improving vascular endothelial function, arterial stiffness, insulin sensitivity, and metabolic syndrome risk status; and to assess whether these effects are dose-dependent. As a secondary objective, we will examine the vitamin D supplementation-induced effect on adipokines and inflammatory markers relevant to CVD risk. In a double-masked, controlled trial, we will randomize 252 eligible children to receive either 600 IU (conventional supplementation), or 1000 IU or 2000 IU (enhanced supplementation) of vitamin D3 daily for 6 months.

Not Provided
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
  • Obesity
  • Vitamin D Deficiency
Dietary Supplement: Vitamin D3
Tablet form
Other Name: Cholecalciferol
  • Active Comparator: Vitamin D3 2000 IU
    Vitamin D3 2000 IU tablet once daily by mouth for 6 months
    Intervention: Dietary Supplement: Vitamin D3
  • Active Comparator: Vitamin D3 1000 IU
    Vitamin D3 1000 IU tablet by mouth once daily for 6 months
    Intervention: Dietary Supplement: Vitamin D3
  • Placebo Comparator: Vitamin D3 600 IU
    Vitamin D3 600 IU tablet by mouth once daily for 6 months
    Intervention: Dietary Supplement: Vitamin D3
Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
August 2017
August 2017   (final data collection date for primary outcome measure)

Inclusion Criteria:

  • Eligible subjects will be 10 to 18 years of age;
  • obese or overweight (BMI ≥85th %tile);
  • otherwise healthy, and
  • have a serum 25(OH)D concentration <20 ng/mL

Children taking multivitamins should be able to hold off their multivitamins during the course of the study.

Exclusion Criteria:

Children will be excluded if they

  • (a) have hepatic or renal disease, metabolic rickets, malabsorptive disorders, primary hyperparathyroidism, hyperthyroidism, or other chronic disorders that could affect vitamin D metabolism;
  • (b) are receiving treatment with anticonvulsants, systemic glucocorticoids, pharmacologic doses of vitamin D (≥1000 IU of vitamin D2 or D3 daily), antihypertensives, vasoactive drugs, antilipidemics, metformin, antipsychotics, or other oral insulin regulators;
  • (c) have cholelithiasis or urolithiasis;
  • (d) have type 1 or type 2 diabetes; or
  • (e) have a condition or underlying abnormality that could compromise the safety of the subject.

Post-menarchial girls with a positive pregnancy test at randomization, or subjects found during the screening phase to have hypercalcemia (serum calcium >10.8 mg/dL) or significant fasting hyperglycemia (fasting blood glucose ≥ 125 mg/dL) will also be excluded.

10 Years to 18 Years
Contact: Flora Olabopo, BS 412-692-8737
Contact: Kumaravel Rajakumar, MD, MS 412-692-5415
United States
PRO12100034, R01HL112985
Kumaravel Rajakumar, University of Pittsburgh
University of Pittsburgh
National Heart, Lung, and Blood Institute (NHLBI)
Principal Investigator: Kumaravel Rajakumar, MD, MS University of Pittsburgh, Children's Hospital of Pittsburgh of UPMC
University of Pittsburgh
December 2014

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP