Influence of Vitamin D Treatment on Multi-systemic Functions in Young Men With Vitamin D Deficiency Due to Work Conditions

January 30, 2013 updated by: rambam56, Rambam Health Care Campus

Prospective, Randomized, Double Blind Placebo Controled Clinical Trial to Assess the Multi- Systemic Effect of Vitamin D Supplementation on Young Men With Vitamin D Deficiency

Vitamin D has multiple systemic effects: bone and calcium metabolism, muscle function, insulin responsiveness, body-composition regulation, cell differentiation, and the immune system. Proper status of vitamin D is found to be related to risk reduction in hypertension, cardiac and vascular diseases, autoimmune diseases, and others. Furthermore, vitamin D supplementation resulted in improved endothelial function. Limited sun exposure may lead to vitamin D deficiency, and it may be assumed that modern life styles lead to a lack of sun exposure. Long work-days may be the primary risk factor for vitamin D deficiency. The purpose of this research is to study the effect of vitamin D treatment on multi systemic functions in young healthy men with vitamin D deficiency due to working conditions.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The study has 2 stages: first stage would be survey of 400 employees, who will fill out a questionnaire to identify occupational and demographic risk factors, a nutritional questionnaire, and data from periodic checkups will be collected. Participants will sign a consent form for vitamin D level determinations, and for freezing blood samples. From this survey, the participants that have vitamin D deficiency (25(OH)D levels < 20 ng/ml) will continue to the second stage of the study - administration of vitamin D or placebo. Participants in the interventional study will sign an additional consent form. Length of follow-up: one year. All parameters will be tested at 0, 6, and 12 months.

Study Type

Interventional

Enrollment (Actual)

358

Phase

  • Phase 4

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Israel
      • Haifa, Israel
        • Rambam Health Care Campus

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

25 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Male

Description

Inclusion Criteria:

  • Healthy men between 20-65 years old
  • For stage 2: baseline 25(OH)D levels < 20 ng/ml

Exclusion Criteria:

  • Liver dysfunction
  • Kidney dysfunction
  • Patients with unbalanced chronic diseases
  • Regular use of medications that lower serum vitamin D levels, or which interfere with intestinal vitamin D absorption

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: placebo
Dietary supplement: Placebo
Placebo
Active Comparator: vitamin D
Dietary supplement: Vitamin D
Oral vitamin D 100,000 IU

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Serum level of 25(OH)D
Time Frame: 12 months
12 months

Secondary Outcome Measures

Outcome Measure
Time Frame
Blood pressure, Endothelial function, Muscle strength. Quality of life, absence from work Laboratory measures:PTH, P1NP, β-CTx, Inflammation markers (hs-CRP), Fasting glucose levels, Insulin, Lipids profile
Time Frame: 12 months
12 months

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Rambam Health Care Campus

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

September 1, 2009

Primary Completion (Actual)

March 1, 2012

Study Completion (Actual)

March 1, 2012

Study Registration Dates

First Submitted

November 18, 2009

First Submitted That Met QC Criteria

November 18, 2009

First Posted (Estimate)

November 19, 2009

Study Record Updates

Last Update Posted (Estimate)

February 1, 2013

Last Update Submitted That Met QC Criteria

January 30, 2013

Last Verified

January 1, 2013

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • odds3153

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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