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A mathematical model for seasonal variability of vitamin D due to solar radiation

Paper ID Volume ID Publish Year Pages File Format Full-Text
30781 44502 2011 7 PDF Available
Title
A mathematical model for seasonal variability of vitamin D due to solar radiation
Abstract

It is widely recognized that vitamin D deficiency has detrimental health consequences. The ultraviolet (UV) B radiation increases the serum vitamin D level, expressed by 25-hydroxyvitamin-D3 [25(OH)D]. An analytical model is presented to calculate the serum 25(OH)D changes throughout a year, caused by the solar exposure variability due to geophysical and habitual factors. The model is tuned by taking into account recent experimental results of serum 25(OH)D changes, after a series of artificial (by fluorescent tubes) UV exposures. The model uses the erythemal and vitamin D weighted irradiances, inferred from the Brewer spectrophotometer and the Kipp and Zonen broad-band meter measurements, carried out in Belsk (52°N, 21°E), Poland, in 2010. The modeled seasonal pattern of the serum 25(OH)D concentration in Polish indoor workers is only slightly different, than in subjects with typical outdoor activity habits, and in those with sun-seeking behavior. A deep minimum in the serum 25(OH)D concentration appears in late winter, regardless of outdoor activity habits. An extra sunbathing to boost the vitamin D level is not worth taking, because of a minor improvement of the vitamin D status, and because of a greater erythema risk. It would be much safer and more effective to maintain an adequate vitamin D level through diet supplements, even in summer, for non sun-seeking subjects.

► A model of outdoor UV exposure impact on vitamin D status in humans is developed. ► Model input is based on the irradiance observations and possible outdoor scenarios. ► Vitamin D status throughout 2010 is calculated for typical Polish indoor workers. ► The workers could not maintain adequate vitamin D level throughout most of the year. ► Boosting vitamin D level by sunbathing is risky (erythema) and not much help solution.

Keywords
Erythema; Seasonal exposure; Solar UV radiation; Vitamin D
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A mathematical model for seasonal variability of vitamin D due to solar radiation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 105, Issue 1, 5 October 2011, Pages 106–112
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us