The effect of darkness on vitamin D in adults

Fairney, Angela; Fry, Julia M.; Lipscomb, Alys

doi:10.1136/pgmj.55.642.248

Cited by 21 publications

(15 citation statements)

References 12 publications

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“…Antarctica were mostly observational and showed a decrease in 25-hydroxyvitamin D status, as expected (21)(22)(23)(24)(25)(26). A shorter study (49 d) in submariners documented the inability of 400-IU doses to improve 25-hydroxyvitamin D concentrations (27).…”

Section: Discussionmentioning

confidence: 80%

Vitamin D supplementation during Antarctic winter

Smith

Gardner

Locke

et al. 2009

The American Journal of Clinical Nutrition

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Section: Discussionmentioning

confidence: 80%

Vitamin D supplementation during Antarctic winter

Smith

Gardner

Locke

et al. 2009

The American Journal of Clinical Nutrition

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“…The nine polar region studies included 556 individuals . Mean serum 25(OH)D remained adequate in four of 12 datasets during the prolonged winter season during which winter UVR does not contribute to serum vitamin D levels (Fig.…”

Section: Resultsmentioning

confidence: 99%

Limited exposure to ambient ultraviolet radiation and 25-hydroxyvitamin D levels: a systematic review

et al. 2015

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“…Similarly, it has already been shown that sojourns in Antarctica induce a marked seasonal drop in circulating levels of 25(OH)D (Fairney et al 1979;Griths and Fairney 1989;Oliveri et al 1994;Pitson et al 1996). Despite these well known seasonal variations in 25(OH)D, the few studies in which 1,25(OH) 2 D levels in relation to seasonal cycles have been investigated, have produced controversial results, either reporting no seasonal eect on 1,25(OH) 2 D levels (Chesney et al 1981;Tjellesen and Christiansen 1983;Pitson et al 1996), or signi®cant seasonal variations with low winter and high summer values of 1,25(OH) 2 D (Juttmann et al 1981;Bouillon et al 1987; Vanderschueren et al 1991).…”

Section: Introductionmentioning

confidence: 75%

Decreased serum levels of 1,25-(OH) 2 vitamin D during 1 year of sunlight deprivation in the Antarctic

Zérath

Holy

Gaud

et al. 1999

European Journal of Applied Physiology

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French Antarctic territories harbor bases that are devoted to scientific and technical work. Living and working conditions during 1-year sojourns in such an environment are quite acceptable, but the confinement and the drop in ultraviolet B radiation exposure during winter months raise the problem of preservation of normal vitamin D status. Seasonal variations in 25-hydroxyvitamin D [25(OH)D] levels have been well documented, but the effect of sunshine deprivation on 1,25 dihydroxyvitamin D [1,25(OH)2D] levels is quite controversial. The aim of this study was to address this question under the exceptional conditions of lack of sunshine exposure. Fifteen male Caucasian subjects participating in a 1-year mission in Antarctica were investigated. They were subjected to seven blood samplings, one before and six during their sojourn. Serum levels of 25(OH)D, 1,25(OH)2D, osteocalcin, and ICTP were measured. We found that levels of 25(OH)D and 1,25(OH)2D significantly decreased in these subjects during the mission, minimum levels being observed 10 months after their departure from France. ICTP concentrations did not change throughout this study, but osteocalcin levels were found to be higher at the end of the sojourn than before departure, which could argue for the existence of bone remodeling changes. Further studies are now needed to fully investigate bone metabolism changes and to address the question of vitamin D supplementation during this kind of sojourn.

show abstract

The effect of darkness on vitamin D in adults

Cited by 21 publications

References 12 publications

Vitamin D supplementation during Antarctic winter

Vitamin D supplementation during Antarctic winter

Limited exposure to ambient ultraviolet radiation and 25-hydroxyvitamin D levels: a systematic review

Decreased serum levels of 1,25-(OH) 2 vitamin D during 1 year of sunlight deprivation in the Antarctic

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