The effect of vernal solar UV radiation on serum 25-hydroxyvitamin D concentration depends on the baseline level : observations from a high latitude in Finland

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http://hdl.handle.net/10138/193765

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Karppinen , T , Ala-Houhala , M , Ylianttila , L , Kautiainen , H , Lakkala , K , Hannula , H-R , Turunen , E , Viljakainen , H , Reunala , T & Snellman , E 2017 , ' The effect of vernal solar UV radiation on serum 25-hydroxyvitamin D concentration depends on the baseline level : observations from a high latitude in Finland ' , International Journal of Circumpolar Health , vol. 76 , 1272790 . https://doi.org/10.1080/22423982.2016.1272790

Title: The effect of vernal solar UV radiation on serum 25-hydroxyvitamin D concentration depends on the baseline level : observations from a high latitude in Finland
Author: Karppinen, Toni; Ala-Houhala, Meri; Ylianttila, Lasse; Kautiainen, Hannu; Lakkala, Kaisa; Hannula, Henna-Reetta; Turunen, Esa; Viljakainen, Heli; Reunala, Timo; Snellman, Erna
Contributor: University of Helsinki, Department of General Practice and Primary Health Care
University of Helsinki, Clinicum
Date: 2017
Language: eng
Number of pages: 7
Belongs to series: International Journal of Circumpolar Health
ISSN: 1239-9736
URI: http://hdl.handle.net/10138/193765
Abstract: Humans obtain vitamin D from conversion of 7-dehydrocholesterol in the skin by ultraviolet B (UVB) radiation or from dietary sources. As the radiation level is insufficient in winter, vitamin D deficiency is common at higher latitudes. We assessed whether vernal solar UVB radiation at latitudes 61 degrees N and 67 degrees N in Finland has an impact on serum 25-hydroxyvitamin D [S-25(OH) D] concentrations. Twenty-seven healthy volunteers participated in outdoor activities in snow-covered terrain for 4-10 days in March or April, with their face and hands sun-exposed. The personal UVB doses and S-25(OH) D levels were monitored. A mean UVB dose of 11.8 standard erythema doses (SED) was received during an average of 12.3 outdoor hours. The mean S-25(OH) D concentration in subjects with a baseline concentration below 90.0 nmol/L (n=13) increased significantly, by 6.0 nmol/L from an initial mean of 62.4 nmol/L (p
Subject: 25(OH)D
vitamin D
ultraviolet
UVB
spring
VITAMIN-D PRODUCTION
HUMAN-SKIN
EXPOSURE
OZONE
SNOW
ALBEDO
COHORT
WOMEN
FACE
MASS
3142 Public health care science, environmental and occupational health
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