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Tanning in human skin types II and III offers modest photoprotection against erythema.
Photochem Photobiol. 1998 Oct; 68(4):588-92.PP

Abstract

We have investigated the photoprotective properties of tanning using erythema as an endpoint. Previously unexposed buttock skin sites of 16 young, healthy adults (8 skin type II, and 8 skin type III) were exposed daily (Mon-Fri) for 2 weeks to 0.5 and 0.75 minimal erythema doses (MED) of solar-simulated radiation (SSR). Erythema and melanin levels were assessed daily both visually and quantitatively using a reflectance device. One week after the last tanning treatment, MED reassessments were made on pretreated sites and on adjacent nontreated sites, including sites from which stratum corneum was removed by tape stripping. Compared to skin type II, similar daily SSR treatments produced less erythema and more evident tanning in skin types III. Independent of skin type, all volunteers showed an increased MED value when assessed on the 0.75 MED- and 0.5 MED-treated sites compared to the MED value assessed on adjacent untreated sites. We express any increase in MED as an induced protection factor (IPF), i.e. (MED post-tan/MED pre-tan). Our data show mean IPF of 1.4 and of 2.1 in the 0.5 and 0.75 MED-treated sites respectively, in skin types II. Similar values were obtained in skin types III with IPF of 1.5 and 2.3 for the 0.5 and 0.75 MED-treated sites, respectively. In all cases, removal of the stratum corneum lowered the IPF by about 20%. Our results show that SSR-induced melanogenesis, whether in skin type II or III, offers only moderate protection against erythema and suggest that SSR-induced stratum corneum thickening affords less photoprotection than tanning.

Authors+Show Affiliations

Department of Photobiology, St John's Institute of Dermatology, St Thomas's Hospital, London, UK. j.sheehan@umds.ac.ukNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

9796443

Citation

Sheehan, J M., et al. "Tanning in Human Skin Types II and III Offers Modest Photoprotection Against Erythema." Photochemistry and Photobiology, vol. 68, no. 4, 1998, pp. 588-92.
Sheehan JM, Potten CS, Young AR. Tanning in human skin types II and III offers modest photoprotection against erythema. Photochem Photobiol. 1998;68(4):588-92.
Sheehan, J. M., Potten, C. S., & Young, A. R. (1998). Tanning in human skin types II and III offers modest photoprotection against erythema. Photochemistry and Photobiology, 68(4), 588-92.
Sheehan JM, Potten CS, Young AR. Tanning in Human Skin Types II and III Offers Modest Photoprotection Against Erythema. Photochem Photobiol. 1998;68(4):588-92. PubMed PMID: 9796443.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Tanning in human skin types II and III offers modest photoprotection against erythema. AU - Sheehan,J M, AU - Potten,C S, AU - Young,A R, PY - 1998/10/31/pubmed PY - 1998/10/31/medline PY - 1998/10/31/entrez SP - 588 EP - 92 JF - Photochemistry and photobiology JO - Photochem Photobiol VL - 68 IS - 4 N2 - We have investigated the photoprotective properties of tanning using erythema as an endpoint. Previously unexposed buttock skin sites of 16 young, healthy adults (8 skin type II, and 8 skin type III) were exposed daily (Mon-Fri) for 2 weeks to 0.5 and 0.75 minimal erythema doses (MED) of solar-simulated radiation (SSR). Erythema and melanin levels were assessed daily both visually and quantitatively using a reflectance device. One week after the last tanning treatment, MED reassessments were made on pretreated sites and on adjacent nontreated sites, including sites from which stratum corneum was removed by tape stripping. Compared to skin type II, similar daily SSR treatments produced less erythema and more evident tanning in skin types III. Independent of skin type, all volunteers showed an increased MED value when assessed on the 0.75 MED- and 0.5 MED-treated sites compared to the MED value assessed on adjacent untreated sites. We express any increase in MED as an induced protection factor (IPF), i.e. (MED post-tan/MED pre-tan). Our data show mean IPF of 1.4 and of 2.1 in the 0.5 and 0.75 MED-treated sites respectively, in skin types II. Similar values were obtained in skin types III with IPF of 1.5 and 2.3 for the 0.5 and 0.75 MED-treated sites, respectively. In all cases, removal of the stratum corneum lowered the IPF by about 20%. Our results show that SSR-induced melanogenesis, whether in skin type II or III, offers only moderate protection against erythema and suggest that SSR-induced stratum corneum thickening affords less photoprotection than tanning. SN - 0031-8655 UR - https://www.unboundmedicine.com/medline/citation/9796443/Tanning_in_human_skin_types_II_and_III_offers_modest_photoprotection_against_erythema_ L2 - https://onlinelibrary.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=0031-8655&date=1998&volume=68&issue=4&spage=588 DB - PRIME DP - Unbound Medicine ER -