Production of Vitamin D Metabolites by UV-radiation From Solar Bed

March 15, 2012 updated by: Louise Lind Schierbeck, Hvidovre University Hospital

Background:

Some patients do not readily absorb vitamin D from intestine. These patients may be helped by ultraviolet rays, which can come from sunlight or solar beds. When the skin is exposed to ultraviolet B rays (UVB) vitamin D is produced. This usually happens when the skin is exposed to sunlight. Vitamin D can also be ingested trough some foods, mainly fatty fish or supplements.

Vitamin D is important for bone, and long-term vitamin D deficiency can lead to osteoporosis. Vitamin D may also be important for the immune system-including autoimmune diseases-and the cardiovascular system.

Purpose:

The main purpose of the study is to learn more about the production of vitamin D3 in the skin, by ultraviolet radiation.

Study Course:

Day 0: Randomization. Subjects are randomized to two groups. Subjects in both groups will be exposed to light in a solar bed for approximately 10 minutes on the first day, but only one of the solar beds wields ultraviolet rays. The other has a filter, which filters out the ultraviolet rays.

Blood samples are drawn on the first day at following times: Before solar bed, after at 15 minutes, 1, 2, 4 and 6 hours.

Day 1,2,3 and 7 after solar bed exposure:

Blood samples are drawn and adverse events are registered.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Actual)

20

Phase

  • Not Applicable

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

  • Denmark
      • Hvidovre, Denmark, 2650
        • Hvidovre University Hospital

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

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

Healthy adults

Exclusion Criteria:

Abnormal ALT or Creatinine Pregnancy

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: Basic Science
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Quadruple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Solar bed UV-radiation
Radiation: UV radiation
Subjects in both groups will be exposed to light in a solar bed for approximately 10 minutes (depending on Fitzpatrick skin type test) on the first day, but only one of the solar beds wields ultraviolet rays. The other has a filter, which filters out the ultraviolet rays.
Sham Comparator: Solar bed with UV filter
Radiation: UV radiation
Subjects in both groups will be exposed to light in a solar bed for approximately 10 minutes (depending on Fitzpatrick skin type test) on the first day, but only one of the solar beds wields ultraviolet rays. The other has a filter, which filters out the ultraviolet rays.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Vitamin D 25-OHD
Time Frame: 8 days
8 days

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Changes in other calcium metabolic factors
Time Frame: 8 days
Vitamin D3, Mg++, PTH, PO4--, Ca++
8 days

Collaborators and Investigators

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

Sponsor

Hvidovre University Hospital

Investigators

  • Study Chair: Jens-Erik B Jensen, MD, PhD, Hvidovre University Hospital
  • Study Chair: Louise L Schierbeck, MD, Dept. of Endocrinology
  • Study Chair: Ulrich Bang, MD, Hvidovre University Hospital
  • Principal Investigator: Jakob H Langdahl, University of Copenhagen

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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

April 1, 2010

Primary Completion (Actual)

February 1, 2011

Study Completion (Actual)

February 1, 2011

Study Registration Dates

First Submitted

December 15, 2010

First Submitted That Met QC Criteria

December 15, 2010

First Posted (Estimate)

December 16, 2010

Study Record Updates

Last Update Posted (Estimate)

March 16, 2012

Last Update Submitted That Met QC Criteria

March 15, 2012

Last Verified

March 1, 2012

More Information

Terms related to this study

Other Study ID Numbers

  • h-3-2009-145

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

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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