NCT00473317

Sunlight Exposures Effect on Serum Vitamin D Levels

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 6 (actual)
• Sponsor: Creighton University · Academic / Other
• Sex: All
• Age: 19 Years – 50 Years
• Healthy volunteers: Accepted

Summary

When people eat a meal, some, but not all of the calcium in that meal is absorbed, that is, moved into the bloodstream. When the skin is exposed to sunlight during summer months, Vitamin D is made there and then modified into more active forms by the liver and kidneys. These more active forms of Vitamin D improve calcium absorption. Many adults living in the U.S. have little or no sun exposure and are low in Vitamin D. We know that specific wavelengths of sunlight called Ultraviolet-B cause Vitamin D to be made in the skin.

Detailed description

At the beginning of the study we will measure your height, weight, skin color, and draw blood to measure your blood levels of Vitamin D and 25-hydroxyvitamin D. Each subject will wear a swimming suit and be exposed to sunlight for 30 minutes total (15 minutes lying on back, 15 minutes lying on stomach).We will draw blood for Vitamin D and 25-hydroxyvitamin D on days 1,2,3,5, and 7 after sunlight exposure. There will be six blood draws for a total of 102 cc of blood drawn (about 3 ½ teaspoons drawn each time).

Conditions

• Vitamin D Deficiency

Interventions

Type	Name	Description
BEHAVIORAL	Sun Exposure	Each subject will wear a swimming suit and be exposed to sunlight for 30 minutes total (15 minutes lying on back, 15 minutes lying on stomach).

Timeline

• Start date: 2007-07-01
• Primary completion: 2007-09-01
• Completion: 2007-09-01
• First posted: 2007-05-15
• Last updated: 2008-04-01

Locations

1 site across 1 country: United States