Abstract
In Dresden (51°N) the 25(OH)D3-serum levels in residents of nursing homes and of an old people’s home ranged below the lower border (≤10 ng/ml). A comparison to young healthy persons resulted in reduced serum levels, too (December: 14.9 ± 4.2 ng/ml, February: 16.2 ± 7.2 ng/ml; n = 31) [1]. In vitro investigations (Edmonton/Canada, 52°N) demonstrated that the spectral components of the solar UV-radiation have no capacity to photoconvert provitamin D3 to previtamin D3 between October and March [2].
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References
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Webb AR, Kline L, Holick MF. Influence of season and latitude on the cutaneous synthesis of Vitamin D3: Exposure to winter sunlight in Boston and Edmonton will not promote vitamin D3 synthesis in human skin
Knuschke P, Darrelmann M, Gerlach B, Lehmann B, Liepe K, Neumann U, Wozel G. Restoration of normal vitamin D-serum levels in elderly people by a long-term low dosage UV-phototherapy. 6th Annual Meeting of the Photomedicine Society, San Francisco/USA, 20 March 1997, Photodematol Photoimunol Photomed 1996;12:251
Flade A. Möglichkeiten des Ausgleichs eines Vitamin D-Defizits bei Pflege-und Altersheimbewohnern (Possibilities to compensate a vitamin D-deficiency in residents of nursing homes and old people’s homes) doctoral thesis (1997), Department of Dermatology, Medical Faculty Carl Gustav Carus, Dresden University of Technology
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Knuschke, P., Lehmann, B., Pinzer, B., Meurer, M., Bocionek, P. (1999). Stimulation of 25(OH)D3-Serum Level by Minimized UV-Exposures of Different Sunbed Lamps in Winter Time. In: Holick, M.F., Jung, E.G. (eds) Biologic Effects of Light 1998. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5051-8_13
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DOI: https://doi.org/10.1007/978-1-4615-5051-8_13
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