INGEBI   02650
INSTITUTO DE INVESTIGACIONES EN INGENIERIA GENETICA Y BIOLOGIA MOLECULAR "DR. HECTOR N TORRES"
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
UV radiation and vitamin D in Southern South America
Autor/es:
DÍAZ, S.B.
Lugar:
Cordoba
Reunión:
Congreso; International Congress of Photobiology. Symposium Vitamin D and Ultraviolet Exposure; 2014
Institución organizadora:
International Union for Photobiology
Resumen:
Ultraviolet Radiation (UVR) plays a key role in several biological functions, including human health. The relationship between vitamin D production and UVR is well known. There is also evidence relating low levels of vitamin D with certain internal cancers. Several epidemiological studies have shown an inverse relationship between these types of cancer and latitude, in accordance with the UVR latitudinal gradient. Given the latitudinal extension of Chile and Argentina (approximately from 24 to 55 degrees South), they present a variety of exposure situations, and the habitants of the southern regions would be exposed to low UVR   In this study, vitamin D production weighted irradiance in eight stations distributed between S.S de Jujuy (24.17°S, 65.02°W) and  Ushuaia (54° 50'S, 68° 18'W) were analyzed daily integrated values. Radiation levels are combined with skin type and exposed area of the body, to evaluate the latitudes at which population is at risk of low Vitamin D levels. It was observed that irradiances in southern regions are much lower than in central and northern ones, being bellow the minimum required for vitamin D production during part of the year. Nevertheless, it should be pointed out that photobiologists need to determine with more accuracy parameters as weighting funtion for Vitamin D photoproduction, appropriate vitamin D level in blood and exposure time to obtain that level. The ratio irradiance weighted by vitamin D and irradiance weighted by erythema action spectra is analyzed in order to determine the times of the day when it is possible to expose for a period to produce suitable levels of vitamin D without risk of erythema. Finally necessary exposure periods are analyzed for summer and winter.