1 results for Allen, MW

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

    Scragg, Robert; Stewart, Alistair; McKenzie, RL; Reeder, AI; Liley, JB; Allen, MW (2017-09)

    Journal article
    The University of Auckland Library

    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 <2 SEDEFB per week), and that greater exposures result in only small additional increases in 25(OH)D3.

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