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The optimal time for tanning

Spanish scientists have determined the optimal timing and duration of sunbathing. Proper research is published in the journal Science of the Total Environment, briefly about it informs the Spanish public service scientific news and information.

The main criterion to assess selected scientists receiving the optimal dose of vitamin D, which is synthesized in the human skin under the influence of daylight.

In January, the sun is recommended to be about 130 minutes, when it should be open for at least ten per cent of the body surface. In April and July, quite ten minutes, but about a quarter of the body must be open. In October, the sun need to be half an hour. These guidelines are valid for the southern temperate latitudes.

At northern mid-latitudes in the winter sun should be longer. Radiation, which is produced in 10: 00, enough for 9,7 hours to satisfy the body's requirement for vitamin D. Under the influence of the radiation produced in 16: 00, you need to be within 5,7 hours. In both cases, must be open a minimum of ten percent of the body.

On the other hand, in the spring and summer, about ten minutes of sun exposure, since 13: 00, and about 20 minutes from 15: 00 17 to: 00, will be sufficient to meet the daily requirement of vitamin D. Open to solar radiation at There should be at least a quarter of the body surface.

By their conclusions, scientists have analyzed the parameters of solar radiation within one month of each of the seasons in between 2003 2010 for years.

These conclusions are valid for people with a third type of skin (they have dark hair, gray or brown eyes, dark skin, and usually no sunspots), it includes most living in Spain. People with lighter skin because of the risk of burns should be less in the sun. This means that by the natural light sources, they probably do not get enough vitamin D.

The authors also point out that the production of vitamin D in adults of middle age is 66 percent of that of the children. Experts offer to compensate for a possible lack of active substance supplementation.