Solar ultraviolet-B radiation and vitamin D: a cross-sectional population-based study using data from the 2007 to 2009 Canadian Health Measures Survey
Autor: | Reinhold Vieth, Jamie A Greenfield, Philip S. Park, Norman A. McFarlane, Julia A. Knight, Ellie Farahani, Theodore G. Shepherd, Suneil Malik |
---|---|
Jazyk: | angličtina |
Rok vydání: | 2012 |
Předmět: |
Adult
Male Vitamin Canada Adolescent Ultraviolet Rays Cross-sectional study Population Irradiance Cumulative Exposure 030209 endocrinology & metabolism 25-Hydroxyvitamin D Young Adult 03 medical and health sciences chemistry.chemical_compound 0302 clinical medicine Environmental health Vitamin D and neurology Humans Medicine 030212 general & internal medicine Vitamin D Child education Aged Sunlight education.field_of_study Public health business.industry lcsh:Public aspects of medicine Public Health Environmental and Occupational Health lcsh:RA1-1270 Middle Aged Solar ultraviolet-B irradiance Cross-Sectional Studies Ultraviolet B radiation chemistry 13. Climate action Linear Models Female business Research Article |
Zdroj: | BMC Public Health, Vol 12, Iss 1, p 660 (2012) BMC Public Health |
ISSN: | 1471-2458 |
Popis: | Background Exposure to solar ultraviolet-B (UV-B) radiation is a major source of vitamin D3. Chemistry climate models project decreases in ground-level solar erythemal UV over the current century. It is unclear what impact this will have on vitamin D status at the population level. The purpose of this study was to measure the association between ground-level solar UV-B and serum concentrations of 25-hydroxyvitamin D (25(OH)D) using a secondary analysis of the 2007 to 2009 Canadian Health Measures Survey (CHMS). Methods Blood samples collected from individuals aged 12 to 79 years sampled across Canada were analyzed for 25(OH)D (n = 4,398). Solar UV-B irradiance was calculated for the 15 CHMS collection sites using the Tropospheric Ultraviolet and Visible Radiation Model. Multivariable linear regression was used to evaluate the association between 25(OH)D and solar UV-B adjusted for other predictors and to explore effect modification. Results Cumulative solar UV-B irradiance averaged over 91 days (91-day UV-B) prior to blood draw correlated significantly with 25(OH)D. Independent of other predictors, a 1 kJ/m2 increase in 91-day UV-B was associated with a significant 0.5 nmol/L (95% CI 0.3-0.8) increase in mean 25(OH)D (P = 0.0001). The relationship was stronger among younger individuals and those spending more time outdoors. Based on current projections of decreases in ground-level solar UV-B, we predict less than a 1 nmol/L decrease in mean 25(OH)D for the population. Conclusions In Canada, cumulative exposure to ambient solar UV-B has a small but significant association with 25(OH)D concentrations. Public health messages to improve vitamin D status should target safe sun exposure with sunscreen use, and also enhanced dietary and supplemental intake and maintenance of a healthy body weight. |
Databáze: | OpenAIRE |
Externí odkaz: |