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Vitamin D Synthesis Following a Single Bout of Sun Exposure in Older and Younger Men and Women.


ABSTRACT: Older adults are frequently cited as an at-risk population for vitamin D deficiency that may in part be due to decreased cutaneous synthesis, a potentially important source of cholecalciferol (vitamin D3). Previous studies found that cutaneous D3 production declines with age; however, most studies have been conducted ex vivo or in the photobiology lab. The purpose of this study was to characterize the response of vitamin D metabolites following a 30-min bout of sun exposure (15-min each to the dorsal and ventral sides) at close to solar noon in younger and older adults. METHODS:30 healthy individuals with skin type II/III were recruited; a younger cohort, aged 20-37 (n = 18) and an older cohort (n = 12), age 51-69 years. Exposure was at outer limits of sensible sun exposure designed to enhance vitamin D synthesis without increasing risk of photo ageing and non-melanoma skin cancer. Serum D3 concentration was measured at baseline, 24, 48 and 72 h post-exposure. Serum 25(OH)D was measured at baseline and 72 h post-exposure plus 168 h post-exposure in the older cohort. RESULTS:D3 increased in response to sun exposure (time effect; p = 0.002) with a trend for a difference in D3 between cohorts (time*group; p = 0.09). By regression modeling of continuous data, age accounted for 20% of the variation in D3 production. D3 production decreased by 13% per decade. Despite changes in D3, however, serum 25(OH)D did not change from baseline to 72 or 168 h post exposure (p > 0.10). CONCLUSIONS:Serum D3 concentration increased significantly in response to outdoor sun exposure in younger and older adults. While ageing may dampen cutaneous synthesis, sunlight exposure is still a significant source of vitamin D3.

SUBMITTER: Chalcraft JR 

PROVIDER: S-EPMC7468901 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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Vitamin D Synthesis Following a Single Bout of Sun Exposure in Older and Younger Men and Women.

Chalcraft Jenna R JR   Cardinal Linda M LM   Wechsler Perry J PJ   Hollis Bruce W BW   Gerow Kenneth G KG   Alexander Brenda M BM   Keith Jill F JF   Larson-Meyer D Enette DE  

Nutrients 20200727 8


Older adults are frequently cited as an at-risk population for vitamin D deficiency that may in part be due to decreased cutaneous synthesis, a potentially important source of cholecalciferol (vitamin D<sub>3</sub>). Previous studies found that cutaneous D<sub>3</sub> production declines with age; however, most studies have been conducted ex vivo or in the photobiology lab. The purpose of this study was to characterize the response of vitamin D metabolites following a 30-min bout of sun exposure  ...[more]

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