{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T07:03:03Z","timestamp":1790319783283,"version":"4.1.0"},"reference-count":28,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2007,3,19]],"date-time":"2007-03-19T00:00:00Z","timestamp":1174262400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Skin Research and Technology"],"published-print":{"date-parts":[[2007,5]]},"abstract":"<jats:p><jats:bold>Backgrounds\/aims: <\/jats:bold> Although multiple studies have been reported about the biological effects of ultraviolet (UV) radiations, the comparative and long\u2010term reactions of human skin by several different UV\u2010wavebands were not reported. The aim of this study was to investigate a time course of erythema and pigmentation induced by UVA 1, broad\u2010band UVA (BBUVA), narrow\u2010band UVB (NBUVB) and broad\u2010band UVB (BBUVB).<\/jats:p><jats:p><jats:bold>Methods: <\/jats:bold> Ten volunteers participated in this study for 6 months. Four skin areas, from the back of each subject, were irradiated with two minimal erythema dose (MED) of four different UV wavelengths corresponding to UVA 1, BBUVA, NBUVB and BBUVB. Skin color changes were evaluated by visual scoring and values were converted into the <jats:italic>L<\/jats:italic><jats:sup>*<\/jats:sup><jats:italic>a<\/jats:italic><jats:sup>*<\/jats:sup><jats:italic>b<\/jats:italic> color system.<\/jats:p><jats:p><jats:bold>Results: <\/jats:bold> For both UVA 1 and BBUVA, erythema and pigmentation were most pronounced immediately and 1\u2003h after exposure. Thereafter, erythema rapidly diminished but pigmentation persisted throughout the study. For both NBUVB and BBUVB, test areas reacted with erythema of maximum intensity at 1 and 2 days, respectively. A maximum tanning was reached at 3\u20136 days for NBUVB and 4\u20137 days for BBUVB, and the return toward the original color point was at 1 and 3 months, respectively. No significant difference was found in visual and colorimetric evaluation for the time course of skin color changes.<\/jats:p><jats:p><jats:bold>Conclusion: <\/jats:bold> Two MED of UVA produced far prolonged erythema and pigmentation than UVB. For UVA, UVA 1 and BBUVA showed similar intensity and time course of skin reaction. For UVB, erythema and pigmentation produced by NBUVB were milder in intensity and shorter in time course than those by BBUVB. These results would provide standard data on time courses and intensity of skin color changes by different UV wavelengths.<\/jats:p>","DOI":"10.1111\/j.1600-0846.2007.00213.x","type":"journal-article","created":{"date-parts":[[2007,3,19]],"date-time":"2007-03-19T17:27:08Z","timestamp":1174325228000},"page":"154-161","source":"Crossref","is-referenced-by-count":30,"title":["Long\u2010term evaluation of erythema and pigmentation induced by ultraviolet radiations of different 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