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Environmental & Genetic Influences on Vitamin D Status

NCT ID: NCT01208636

Last Updated: 2010-09-24

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

COMPLETED

Total Enrollment

40 participants

Study Classification

OBSERVATIONAL

Study Start Date

2010-08-31

Study Completion Date

2010-08-31

Brief Summary

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The purpose of this study is to determine the effect of environmental and genetic influences on Vitamin D status.

Detailed Description

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Vitamin D deficiency is a common problem. The principal source of vitamin D for humans is solar exposure, with cutaneous synthesis of vitamin D by photoconversion of 7-dehydrocholesterol in the skin to pre-vitamin D3. Latitude, altitude, season, skin pigmentation, and age are recognized factors that influence how much vitamin D can be made by solar exposure. Surprisingly, Vitamin D deficiency has been described in people dwelling in southern Florida and in surfers in Hawaii. We hypothesize that genetic variations in vitamin metabolism accounts for these differences.

Conditions

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Vitamin D Deficiency

Study Design

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Observational Model Type

COHORT

Study Time Perspective

CROSS_SECTIONAL

Study Groups

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Sun exposed people

Sun exposure \>3 hours daily for at least 5 days weekly for the last 3 months.

No interventions assigned to this group

Eligibility Criteria

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Inclusion Criteria

* Able to consent and come for a study visit.
* Male or female between ages 18-60.
* Sun exposure \>3 hours daily for at least 5 days weekly for the last 3 months.

Exclusion Criteria

* Unable to consent or come to a visit
* Taking Vitamin D supplements, anticonvulsants, barbiturates, steroids, having granulomatous disease, or liver or kidney disease as these medications and conditions interfere with Vitamin D metabolism.
* Related to another participant by blood.
Minimum Eligible Age

18 Years

Maximum Eligible Age

60 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes

Sponsors

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Procter and Gamble

INDUSTRY

Sponsor Role collaborator

Creighton University

OTHER

Sponsor Role lead

Responsible Party

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Creighton University

Principal Investigators

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Laura Armas, MD

Role: PRINCIPAL_INVESTIGATOR

Creighton University

Locations

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Creighton University

Omaha, Nebraska, United States

Site Status

Countries

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United States

Other Identifiers

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Creighton9

Identifier Type: -

Identifier Source: org_study_id