Burning daylight: balancing vitamin D requirements with sensible sun exposure.
Med J Aust
; 194(7): 345-8, 2011 Apr 04.
Article
em En
| MEDLINE
| ID: mdl-21470084
ABSTRACT
OBJECTIVE:
To examine the feasibility of balancing sunlight exposure to meet vitamin D requirements with sun protection guidelines. DESIGN ANDSETTING:
We used standard erythemal dose and Ultraviolet Index (UVI) data for 1 June 1996 to 30 December 2005 for seven Australian cities to estimate duration of sun exposure required for fair-skinned individuals to synthesise 1000 IU (25 µg) of vitamin D, with 11% and 17% body exposure, for each season and hour of the day. Periods were classified according to whether the UVI was < 3 or ≥ 3 (when sun protection measures are recommended), and whether required duration of exposure was ≤ 30 min, 31-60 min, or > 60 min. MAIN OUTCOMEMEASURE:
Duration of sunlight exposure required to achieve 1000 IU of vitamin D synthesis.RESULTS:
Duration of sunlight exposure required to synthesise 1000 IU of vitamin D varied by time of day, season and city. Although peak UVI periods are typically promoted as between 10 am and 3 pm, UVI was often ≥ 3 before 10 am or after 3 pm. When the UVI was < 3, there were few opportunities to synthesise 1000 IU of vitamin D within 30 min, with either 11% or 17% body exposure.CONCLUSION:
There is a delicate line between balancing the beneficial effects of sunlight exposure while avoiding its damaging effects. Physiological and geographical factors may reduce vitamin D synthesis, and supplementation may be necessary to achieve adequate vitamin D status for individuals at risk of deficiency.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Luz Solar
/
Vitamina D
/
Deficiência de Vitamina D
/
Política de Saúde
/
Helioterapia
Tipo de estudo:
Clinical_trials
Limite:
Humans
País/Região como assunto:
Oceania
Idioma:
En
Revista:
Med J Aust
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Austrália