OBJECTIVE Black and Hispanic individuals synthesize less vitamin D per unit of sun exposure than white individuals. The relationship between UV radiation and vitamin D insufficiency in minorities has not been well explored. DESIGN Prospective cohort study. SETTING Using the National Health and Nutrition Examination Survey, we obtained serum vitamin D levels for non-Hispanic Whites, Hispanic...

Until now it had been assumed that mammalian skin contains only one provitamin D, 7-dehydrocholesterol, that is eventually converted to vitamin D3 after the skin is exposed to sunlight. Examination by reverse phase high performance liquid chromatography of lipid extracts from young rat skin, however, led to the observation that 7-dehydrocholesterol is not the only provitamin D in rat skin. Anot...

Skin cancers are one of the most common types cancer in United States [1], and melanoma has steadily increased over last 20 years. Solar ultraviolet radiation (UVR) is known as main cause damaging effects to skin [2], yet also preventable risk factor. Outdoor physical activity, an important health behavior, exposes body UVR thus ostensibly linked increases sunburn, melanoma, non-melanoma [3], [...

BACKGROUND Vitamin D insufficiency during winter is common in the Nordic countries. Heliotherapy (HT) may heal atopic dermatitis (AD) but its effect on vitamin D balance has not been examined. OBJECTIVES To study the effect of HT on serum calcidiol (25-hydroxyvitamin D) concentration and on healing of AD. METHODS Twenty-three adult patients with AD received a 2-week course of HT in the Cana...

The additional dose contribution to the radiation exposure at aviation altitudes during Solar Particle Events (SPEs) has been a matter of concern for many years. After the Halloween storms in 2003 several airlines began to implement mitigation measures such as rerouting and lowering flight altitudes in response to alerts on the NOAA S-scale regarding solar radiation storms. These alerts are bas...

Recent evidence for the nonskeletal effects of vitamin D, coupled with recognition that vitamin D deficiency is common, has revived interest in this hormone. Vitamin D is produced by skin exposed to ultraviolet B radiation or obtained from dietary sources, including supplements. Persons commonly at risk for vitamin D deficiency include those with inadequate sun exposure, limited oral intake, or...

Vitamin D is essential for bone health and possibly various other health outcomes. It is available following ultraviolet (UV)-B (280-315nm) irradiation of skin, or oral ingestion. Careful sunscreen use of sun protection factors (SPFs) 18-19 during such exposure reduces blood level increases on sunny holidays by up to about 50%, but these increases remain significant. Further, the maintenance of...

background : one way to optimize energy consumption is replacing incandescent lamp with compact fluorescent lamps .these lamps produce ultraviolet radiation due to the nature of light production. this study aimed to evaluate the ultraviolet radiation emitted from compact fluorescent lamps which are widely used in iran. methods : this study carries out on 16 compact fluorescent lamps (four diffe...