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Sponsors and Collaborators: |
Creighton University Procter and Gamble |
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Information provided by: | Creighton University |
ClinicalTrials.gov Identifier: | NCT00780247 |
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. However, the relative influences of each are largely unknown and we cannot reliably answer the question of how much sun exposure an individual needs at various latitudes and at various seasons in order to ensure normal vitamin D status.
Condition |
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Vitamin D Deficiency |
Study Type: | Observational |
Study Design: | Cohort, Cross-Sectional |
Official Title: | Environmental Influences on Vitamin D Status |
Enrollment: | 50 |
Study Start Date: | July 2008 |
Study Completion Date: | August 2008 |
Primary Completion Date: | August 2008 (Final data collection date for primary outcome measure) |
Groups/Cohorts |
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Alaska residents
50 "healthy" community dwelling males or females.
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Hawaiian residents
50 "healthy" community dwelling males or females at each site
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Purpose of the study: To determine the effect of environmental influences on Vitamin D status.
Specific Aims
Ages Eligible for Study: | 18 Years to 60 Years |
Genders Eligible for Study: | Both |
Accepts Healthy Volunteers: | Yes |
Sampling Method: | Non-Probability Sample |
Age of Subjects: The subjects will be between ages 18-60. The upper age is limited to age 60 as aging skin is less able to make vitamin D, therefore a separate study of elderly people would be more appropriate. Racial and Ethnic Origin: Both sites have a diverse ethnic and racial population and the subjects will be as representative of the population as possible.
Inclusion Criteria:
Exclusion Criteria:
United States, Alaska | |
Alaska Kidney and Diabetes Associates | |
Anchorage, Alaska, United States, 99508 |
Principal Investigator: | Laura A Armas, MD | Creighton University |
Responsible Party: | Creighton University ( Laura Armas, M D ) |
Study ID Numbers: | Creighton6, WIRB approval 20080712 |
Study First Received: | October 24, 2008 |
Last Updated: | October 24, 2008 |
ClinicalTrials.gov Identifier: | NCT00780247 History of Changes |
Health Authority: | United States: Institutional Review Board |
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Nutrition Disorders Trace Elements Bone Density Conservation Agents Micronutrients Deficiency Diseases |
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