Sun exposure and 25-hydroxyvitamin D3 levels in a community sample: Quantifying the association with electronic dosimeters

被引:0
作者
Robert K R Scragg
Alistair W Stewart
Richard L McKenzie
Anthony I Reeder
J Ben Liley
Martin W Allen
机构
[1] Section of Epidemiology and Biostatistics,Department of Preventive and Social Medicine
[2] School of Population Health,Department of Electrical and Computer Engineering
[3] University of Auckland,undefined
[4] National Institute of Water and Atmospheric Research,undefined
[5] Cancer Society Social and Behavioural Research Unit,undefined
[6] University of Otago,undefined
[7] University of Canterbury,undefined
来源
Journal of Exposure Science & Environmental Epidemiology | 2017年 / 27卷
关键词
community survey; dose–response relationship; ultraviolet radiation; sunlight; vitamin D;
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中图分类号
学科分类号
摘要
There is uncertainty about the amount of sun exposure required to increase low blood 25-hydroxyvitamin D (25(OH)D3) levels, a possible disease risk factor. The study aimed to quantify the association between sun exposure and serum 25(OH)D3 concentrations in a multiethnic community sample (n=502) living in Auckland (37°S) and Dunedin (46°S), New Zealand, aged 18–85 years. They wore electronic ultraviolet dosimeters between March and November (autumn, winter and spring) for 8 weeks to record their sun exposure. This was converted to standard erythemal doses (SEDs), corrected for clothing to generate equivalent full-body exposures, SEDEFB. Blood samples were collected at the end of weeks 4 and 8 to measure 25(OH)D3. Median weekly SEDEFB was 0.33 during weeks 1–4 and 0.34 during weeks 5–8. Weekly exposures <0.5 SEDEFB during weeks 5–8 were associated with decreasing 25(OH)D3 concentrations at the end of week 8. There was a non-linear association between sun exposure and 25(OH)D3, with most of the increase in 25(OH)D3 being at exposures <2 SEDEFB per week. This finding suggests that vitamin D status is increased by regular small sun exposures (<2 SEDEFB per week), and that greater exposures result in only small additional increases in 25(OH)D3.
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页码:471 / 477
页数:6
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