Search: id:"swepub:oai:gup.ub.gu.se/220631" >
Seasonal variations...
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Klingberg, EvaGothenburg University,Göteborgs universitet,Institutionen för medicin, avdelningen för reumatologi och inflammationsforskning,Institute of Medicine, Department of Rheumatology and Inflammation Research
(author)
Seasonal variations in serum 25-hydroxy vitamin D levels in a Swedish cohort
- Article/chapterEnglish2015
Publisher, publication year, extent ...
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2015-02-14
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Springer Science and Business Media LLC,2015
Numbers
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LIBRIS-ID:oai:gup.ub.gu.se/220631
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https://gup.ub.gu.se/publication/220631URI
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https://doi.org/10.1007/s12020-015-0548-3DOI
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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To study seasonal inter-individual and intra-individual variations in serum 25-hydroxy vitamin D (25(OH)D) and to explore parameters associated with 25(OH)D in a healthy Swedish adult population. 540 blood donors (60 % men; mean age 41 +/- A 13 years) and 75 thrombocyte donors (92 % men, aged 46 +/- A 11 years) were included. Serum was collected during 12 months and analyzed for 25(OH)D and parathyroid hormone (S-iPTH). The blood donors answered questionnaires concerning vitamin D supplements, smoking, physical activity, sunbed use and sun holidays. Repeated serum samples were collected from the thrombocyte donors to study the intra-individual variations in S-25(OH)D. S-25(OH)D varied greatly over the year correlating with the intensity of the UV-B irradiation (r (S) = 0.326; p < 0.001). During January-March, a S-25(OH)D level below the thresholds of 50 and 75 nmol/L was observed in 58 and 88 %, respectively, and during July-September in 11 and 50 % (p < 0.001). S-25(OH)D was negatively correlated with body mass index and S-iPTH, but was significantly higher in holiday makers in sunny destinations, sunbed users, non-smokers, and in the physically active. The intra-individual analyses showed a mean increase in S-25(OH)D by 8 nmol/L/month between April and August. Approximately 75 % had serum 25(OH)D values < 75 nmol/L during 75 % of the year and 50 % had serum 25(OH)D < 50 nmol/L during 50 % of the year. Serum 25(OH)D was strongly associated with parameters related to sun exposure, but only weakly with intake of vitamin D supplements.
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Oleröd, GöranGothenburg University,Göteborgs universitet,Institutionen för biomedicin, avdelningen för klinisk kemi och transfusionsmedicin,Institute of Biomedicine, Department of Clinical Chemistry and Transfusion Medicine
(author)
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Konar, JanGothenburg University,Göteborgs universitet,Institutionen för biomedicin, avdelningen för klinisk kemi och transfusionsmedicin,Institute of Biomedicine, Department of Clinical Chemistry and Transfusion Medicine
(author)
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Petzold, Max,1973Gothenburg University,Göteborgs universitet,Akademistatistik,Institutionen för medicin, avdelningen för samhällsmedicin och folkhälsa, enheten för arbets-och miljömedicin,Centre for Applied Biostatistics,Institute of Medicine, Department of Public Health and Community Medicine, Section of Occupational and environmental medicine(Swepub:gu)xpemax
(author)
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Hammarsten, OlaGothenburg University,Göteborgs universitet,Institutionen för biomedicin, avdelningen för klinisk kemi och transfusionsmedicin,Institute of Biomedicine, Department of Clinical Chemistry and Transfusion Medicine(Swepub:gu)xhamol
(author)
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Göteborgs universitetInstitutionen för medicin, avdelningen för reumatologi och inflammationsforskning
(creator_code:org_t)
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In:Endocrine: Springer Science and Business Media LLC49:3, s. 800-8081355-008X1559-0100
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