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Issue 12, 2012
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The effects of a mid-winter 8-week course of sub-sunburn sunbed exposures on tanning, vitamin D status and colds

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Abstract

Like UV irradiation, which generates vitamin D3 in the skin, the hormonally active metabolite, 1,25-dihydroxyvitamin D3, boosts innate immunity against viruses and bacteria. Epidemiologic studies have found high vitamin D levels to be associated with lower risk of infections of the upper respiratory tract (colds). We have therefore performed an intervention study in 105 young adults (ages 18–30 years; 91% female) over a mid-winter 8-week period (January–March 2010). The participants were randomised to 3 groups: (A) subjected to 3 times a week sub-sunburn sunbed exposure (n = 35), (B) daily vitamin D supplementation, @ 1000 IU (n = 37), and (C) a control group without any intervention (n = 33). The mean serum level of 25-hydroxyvitamin D (25(OH)D) dropped from 62 to 55 nmol l−1 in group C, while these levels rose from 62 to 109 and from 58 to 93 nmol l−1 in groups A and B, respectively (p < 0.001). The skin on the chest darkened significantly in group A (mean difference in lightness, L*, equalled −5.7, p < 0.001), correlating significantly, but weakly, with increases in 25(OH)D (3.3 nmol l−1 per unit drop in L*, R2 = 0.17, p = 0.014). The percentage of self-reported colds with proper signs and symptoms was only slightly and not significantly reduced in groups A and B in comparison to group C: 57 and 51 versus 67%, respectively. Hence, the sub-sunburn sunbed treatment was effective in tanning and increasing the 25(OH)D serum level, more so than 1000 IU per day, but had no appreciable effect on colds.

Graphical abstract: The effects of a mid-winter 8-week course of sub-sunburn sunbed exposures on tanning, vitamin D status and colds

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Article information


Submitted
08 Jun 2012
Accepted
08 Oct 2012
First published
09 Oct 2012

Photochem. Photobiol. Sci., 2012,11, 1848-1854
Article type
Paper

The effects of a mid-winter 8-week course of sub-sunburn sunbed exposures on tanning, vitamin D status and colds

F. R. de Gruijl and S. Pavel, Photochem. Photobiol. Sci., 2012, 11, 1848
DOI: 10.1039/C2PP25179E

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