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The effect of pre-phototest sun exposure on minimal erythema dose and minimal melanogenic dose among skin phototypes III, IV and V.
Photodermatol Photoimmunol Photomed. 2018 Nov; 34(6):400-404.PP

Abstract

BACKGROUND

Ethnicity, skin phototype and colour influenced minimal erythema dose (MED). Sun exposure has been postulated to increase MED. We determined immediate pigment darkening dose to UVA (IPDDA), MED and minimal melanogenic dose (MMD) for UVB and UVA, and investigated factors affecting these doses.

METHODS

Skin phototype was determined using Fitzpatrick phototype quiz, DSMII ColorMeter measured skin colours, sun exposure quantified using an index (SEI) and phototest performed with MEDlight-Multitester.

RESULTS

A total of 167 healthy volunteers participated. There were 110 (66%) females and 56 (34%) males; 124 (74.7%) were Malay, 27 (16.3%) Chinese and 14 (8.4%) Indians. One hundred and nine (65.7%) skin phototype IV, 30 (18.1%) phototype III and 27 (16.3%) phototype V. IPDDA ranges from 6 ± 1.5-5.7 ± 1.4 J/cm2 . MED-UVB were 96.9 ± 17.6, 124 ± 29.3 and 118.6 ± 27.4 mJ/cm2 for phototype III, IV and V, respectively. All MED-UVA were outside the tested dose range of 3.6-11 J/cm2 . MMD-UVB were 106 ± 18.2, 134 ± 25.6 and 136 ± 31.1 mJ/cm2 while MMD-UVA were 4.1 ± 4.1, 4.9 ± 3.8 and 5.7 ± 3.7 J/cm2 respectively for phototypes III, IV and V. MED-UVB, MMD-UVB and MMD-UVA did not depend on skin phototype. Facultative skin whiteness (L*), erythema (E) and melanin content (M) correlated significantly with MED-UVB while constitutive skin colours were significant for L*, yellowness (b*), E and M. Sun exposure did not significantly correlate with MED-UVB and MMDs, however, an inverse relationship with MED-UVB was demonstrated.

CONCLUSION

Minimal erythema doses in our cohort were slightly different from other regional countries. Constitutive and facultative skin whiteness, erythema and melanin content correlated with MED. There was no association between skin phototype and sun exposure with MED or MMD.

Authors+Show Affiliations

Department of Medicine, Hospital Kuala Lumpur, Kuala Lumpur, Malaysia. Department of Medicine, University Kebangsaan Malaysia Medical Center, Kuala Lumpur, Malaysia.Department of Medicine, University Kebangsaan Malaysia Medical Center, Kuala Lumpur, Malaysia.Department of Medicine, University Kebangsaan Malaysia Medical Center, Kuala Lumpur, Malaysia.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29953669

Citation

Wong, Lok Chin, et al. "The Effect of Pre-phototest Sun Exposure On Minimal Erythema Dose and Minimal Melanogenic Dose Among Skin Phototypes III, IV and V." Photodermatology, Photoimmunology & Photomedicine, vol. 34, no. 6, 2018, pp. 400-404.
Wong LC, Jamil A, Md Nor N. The effect of pre-phototest sun exposure on minimal erythema dose and minimal melanogenic dose among skin phototypes III, IV and V. Photodermatol Photoimmunol Photomed. 2018;34(6):400-404.
Wong, L. C., Jamil, A., & Md Nor, N. (2018). The effect of pre-phototest sun exposure on minimal erythema dose and minimal melanogenic dose among skin phototypes III, IV and V. Photodermatology, Photoimmunology & Photomedicine, 34(6), 400-404. https://doi.org/10.1111/phpp.12410
Wong LC, Jamil A, Md Nor N. The Effect of Pre-phototest Sun Exposure On Minimal Erythema Dose and Minimal Melanogenic Dose Among Skin Phototypes III, IV and V. Photodermatol Photoimmunol Photomed. 2018;34(6):400-404. PubMed PMID: 29953669.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The effect of pre-phototest sun exposure on minimal erythema dose and minimal melanogenic dose among skin phototypes III, IV and V. AU - Wong,Lok Chin, AU - Jamil,Adawiyah, AU - Md Nor,Norazirah, Y1 - 2018/07/17/ PY - 2018/04/04/received PY - 2018/06/25/accepted PY - 2018/6/29/pubmed PY - 2018/12/14/medline PY - 2018/6/29/entrez KW - Asia KW - minimal erythema dose KW - minimal melanogenic dose KW - skin phototypes KW - sun exposure SP - 400 EP - 404 JF - Photodermatology, photoimmunology & photomedicine JO - Photodermatol Photoimmunol Photomed VL - 34 IS - 6 N2 - BACKGROUND: Ethnicity, skin phototype and colour influenced minimal erythema dose (MED). Sun exposure has been postulated to increase MED. We determined immediate pigment darkening dose to UVA (IPDDA), MED and minimal melanogenic dose (MMD) for UVB and UVA, and investigated factors affecting these doses. METHODS: Skin phototype was determined using Fitzpatrick phototype quiz, DSMII ColorMeter measured skin colours, sun exposure quantified using an index (SEI) and phototest performed with MEDlight-Multitester. RESULTS: A total of 167 healthy volunteers participated. There were 110 (66%) females and 56 (34%) males; 124 (74.7%) were Malay, 27 (16.3%) Chinese and 14 (8.4%) Indians. One hundred and nine (65.7%) skin phototype IV, 30 (18.1%) phototype III and 27 (16.3%) phototype V. IPDDA ranges from 6 ± 1.5-5.7 ± 1.4 J/cm2 . MED-UVB were 96.9 ± 17.6, 124 ± 29.3 and 118.6 ± 27.4 mJ/cm2 for phototype III, IV and V, respectively. All MED-UVA were outside the tested dose range of 3.6-11 J/cm2 . MMD-UVB were 106 ± 18.2, 134 ± 25.6 and 136 ± 31.1 mJ/cm2 while MMD-UVA were 4.1 ± 4.1, 4.9 ± 3.8 and 5.7 ± 3.7 J/cm2 respectively for phototypes III, IV and V. MED-UVB, MMD-UVB and MMD-UVA did not depend on skin phototype. Facultative skin whiteness (L*), erythema (E) and melanin content (M) correlated significantly with MED-UVB while constitutive skin colours were significant for L*, yellowness (b*), E and M. Sun exposure did not significantly correlate with MED-UVB and MMDs, however, an inverse relationship with MED-UVB was demonstrated. CONCLUSION: Minimal erythema doses in our cohort were slightly different from other regional countries. Constitutive and facultative skin whiteness, erythema and melanin content correlated with MED. There was no association between skin phototype and sun exposure with MED or MMD. SN - 1600-0781 UR - https://www.unboundmedicine.com/medline/citation/29953669/The_effect_of_pre_phototest_sun_exposure_on_minimal_erythema_dose_and_minimal_melanogenic_dose_among_skin_phototypes_III_IV_and_V_ L2 - https://doi.org/10.1111/phpp.12410 DB - PRIME DP - Unbound Medicine ER -