Vitamin D levels after UVB radiation: effects by UVA additions in a randomized controlled trial

Vitamin D levels after UVB radiation : effects by UVA additions in a randomized controlled trial

BACKGROUND: Ultraviolet B (UVB) radiation increases the serum level of 25-hydroxyvitamin D [25(OH)D]. However, the impact of UVA on vitamin D synthesis by UVB is poorly understood clinically.OBJECTIVE: To examine how different combinations of UVA and UVB radiation affect S-25(OH)D for the same vitamin D-weighted exposure.MATERIALS AND METHODS: Healthy participants were recruited and subsequently divided into four comparable groups regarding initial 25(OH)D value. The different radiations given were whole-body UVB (n = 23), UVAB (n = 23) and UVA (n = 10). The controls (n = 19) had no intervention. The exposure times were chosen to give the same calculated vitamin D effective dose (suberythemal exposures ≤1 standard erythema dose). Blood samples were collected before the first irradiation (t0), immediately after the last (fifth) irradiation (t1) and then after another 2 days after the last (fifth) irradiation (t2).RESULTS: UVB and UVAB radiation significantly increased 25(OH)D levels. In the UVA group the increase was less with the same vitamin D-weighted radiation dose.CONCLUSIONS: Short sessions of UVB or UVAB radiation with the same vitamin D-weighted exposure increased 25(OH)D levels. The UVA dose does not influence 25(OH)D levels under short exposure times. However, there was a significantly lower increase of 25(OH)D levels during longer UVA irradiation (≥9 min).

Wester, UlfSwedish Radiation Safety Authority, Stockholm, Sweden (författare)
Bengtsson, EmilSwedish Radiation Safety Authority, Stockholm, Sweden (författare)
Wiegleb Edström, Desirée,1959-Karolinska Institutet(Swepub:oru)dwm (författare)
Karolinska Institutet, Stockholm, SwedenSwedish Radiation Safety Authority, Stockholm, Sweden (creator_code:org_t)

Ingår i:Photodermatology, Photoimmunology & Photomedicine: Wiley-Blackwell Publishing Inc.29:6, s. 323-3290905-43831600-0781

Av författaren/redakt...: Sallander, Ellin ...; Wester, Ulf; Bengtsson, Emil; Wiegleb Edström, ...

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