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Recommended summer sunlight exposure levels can produce sufficient (> or =20 ng ml(-1)) but not the proposed optimal (> or =32 ng ml(-1)) 25(OH)D levels at UK latitudes.
J Invest Dermatol. 2010 May; 130(5):1411-8.JI

Abstract

Recommendations on limitation of summer sunlight exposure to prevent skin cancer may conflict with requirements to protect bone health through adequate vitamin D levels, the principal source being UVB in summer sunlight. We determined whether sufficient (> or =20 ng ml(-1)) and proposed optimal (> or =32 ng ml(-1)) 25(OH)D levels are attained by following UK guidance advising casual short exposures to UVB in summer sunlight, and performed the study under known conditions to enhance the specificity of future recommendations. During wintertime, when ambient UVB is negligible, 120 white Caucasians, aged 20-60 years, from Greater Manchester, UK (53.5 degrees N) received a simulated summer's sunlight exposures, specifically 1.3 standard erythemal dose, three times weekly for 6 weeks, while wearing T-shirt and shorts. The baseline winter data predict that 5% (confidence interval (CI): 2.7-8.6) of Greater Manchester white Caucasians have deficient (<5 ng ml(-1)) 25(OH)D, 62.5% (CI: 55.2-69.4) have insufficient, and only 2.9% (CI: 1.4-5.6) have proposed optimal levels. After the simulated summer exposures, 90 (CI: 84.9-93.7) and 26.2% (CI: 20.1-33.2) reached 20 and 32 ng ml(-1) 25(OH)D, respectively. Assuming midday UVB levels, sufficient but suboptimal vitamin D status is attained after a summer's short (13 minutes) sunlight exposures to 35% skin surface area; these findings will assist future public health guidance on vitamin D acquisition.

Authors+Show Affiliations

Photobiology Unit, Dermatological Sciences, School of Translational Medicine, University of Manchester, Manchester Academic Health Science Centre, Salford Royal NHS Foundation Hospital, Manchester, UK. lesley.e.rhodes@manchester.ac.ukNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20072137

Citation

Rhodes, Lesley E., et al. "Recommended Summer Sunlight Exposure Levels Can Produce Sufficient (> or =20 Ng Ml(-1)) but Not the Proposed Optimal (> or =32 Ng Ml(-1)) 25(OH)D Levels at UK Latitudes." The Journal of Investigative Dermatology, vol. 130, no. 5, 2010, pp. 1411-8.
Rhodes LE, Webb AR, Fraser HI, et al. Recommended summer sunlight exposure levels can produce sufficient (> or =20 ng ml(-1)) but not the proposed optimal (> or =32 ng ml(-1)) 25(OH)D levels at UK latitudes. J Invest Dermatol. 2010;130(5):1411-8.
Rhodes, L. E., Webb, A. R., Fraser, H. I., Kift, R., Durkin, M. T., Allan, D., O'Brien, S. J., Vail, A., & Berry, J. L. (2010). Recommended summer sunlight exposure levels can produce sufficient (> or =20 ng ml(-1)) but not the proposed optimal (> or =32 ng ml(-1)) 25(OH)D levels at UK latitudes. The Journal of Investigative Dermatology, 130(5), 1411-8. https://doi.org/10.1038/jid.2009.417
Rhodes LE, et al. Recommended Summer Sunlight Exposure Levels Can Produce Sufficient (> or =20 Ng Ml(-1)) but Not the Proposed Optimal (> or =32 Ng Ml(-1)) 25(OH)D Levels at UK Latitudes. J Invest Dermatol. 2010;130(5):1411-8. PubMed PMID: 20072137.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Recommended summer sunlight exposure levels can produce sufficient (> or =20 ng ml(-1)) but not the proposed optimal (> or =32 ng ml(-1)) 25(OH)D levels at UK latitudes. AU - Rhodes,Lesley E, AU - Webb,Ann R, AU - Fraser,Heather I, AU - Kift,Richard, AU - Durkin,Marie T, AU - Allan,Donald, AU - O'Brien,Sarah J, AU - Vail,Andy, AU - Berry,Jacqueline L, Y1 - 2010/01/14/ PY - 2010/1/15/entrez PY - 2010/1/15/pubmed PY - 2010/5/14/medline SP - 1411 EP - 8 JF - The Journal of investigative dermatology JO - J Invest Dermatol VL - 130 IS - 5 N2 - Recommendations on limitation of summer sunlight exposure to prevent skin cancer may conflict with requirements to protect bone health through adequate vitamin D levels, the principal source being UVB in summer sunlight. We determined whether sufficient (> or =20 ng ml(-1)) and proposed optimal (> or =32 ng ml(-1)) 25(OH)D levels are attained by following UK guidance advising casual short exposures to UVB in summer sunlight, and performed the study under known conditions to enhance the specificity of future recommendations. During wintertime, when ambient UVB is negligible, 120 white Caucasians, aged 20-60 years, from Greater Manchester, UK (53.5 degrees N) received a simulated summer's sunlight exposures, specifically 1.3 standard erythemal dose, three times weekly for 6 weeks, while wearing T-shirt and shorts. The baseline winter data predict that 5% (confidence interval (CI): 2.7-8.6) of Greater Manchester white Caucasians have deficient (<5 ng ml(-1)) 25(OH)D, 62.5% (CI: 55.2-69.4) have insufficient, and only 2.9% (CI: 1.4-5.6) have proposed optimal levels. After the simulated summer exposures, 90 (CI: 84.9-93.7) and 26.2% (CI: 20.1-33.2) reached 20 and 32 ng ml(-1) 25(OH)D, respectively. Assuming midday UVB levels, sufficient but suboptimal vitamin D status is attained after a summer's short (13 minutes) sunlight exposures to 35% skin surface area; these findings will assist future public health guidance on vitamin D acquisition. SN - 1523-1747 UR - https://www.unboundmedicine.com/medline/citation/20072137/Recommended_summer_sunlight_exposure_levels_can_produce_sufficient__>_or_=20_ng_ml__1___but_not_the_proposed_optimal__>_or_=32_ng_ml__1___25_OH_D_levels_at_UK_latitudes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0022-202X(15)34825-9 DB - PRIME DP - Unbound Medicine ER -