Sunlight may help reduce high blood pressure: study
Written by GLRAdmin on January 23, 2014
Moderate exposure to the sun’s UV rays causes the blood vessels to dilate, lowering blood pressure, British researchers found. The results could help explain why there are higher levels of heart disease in winter and further from the equator.
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British researchers found exposure to sunlight alters the level of nitric oxide in the skin, dilating blood vessels and thus easing hypertension.
Sunlight may help to reduce high blood pressure, a danger factor for heart attacks and stroke, a study published in a specialist journal said on Monday.
British researchers found exposure to sunlight alters the level of nitric oxide in the skin, dilating blood vessels and thus easing hypertension.
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“Small amounts of NO [nitric oxide] are transferred from the skin to the circulation, lowering blood vessel tone,” said Martin Feelisch, a professor of experimental medicine at the University of Southampton in southern England.
“As blood pressure drops, so does the risk of heart attack and stroke.”
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The team analyzed 24 volunteers who were exposed to ultraviolet (UVA) light from tanning lamps for two 20-minute sessions.
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In the second, the UV was blocked so that only the heat of the lamps affected the skin.
The findings back up data about blood pressure and cardiovascular disease, which are known to vary according to season and latitude.
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Higher levels are observed in winter and in countries that are farther from the equator, where ultraviolet from the sun is lower.
“These results are significant to the ongoing debate about potential health benefits of sunlight and the role of Vitamin D in this process,” Feelisch said in a press release.
“Avoiding excess sunlight exposure is critical to prevent skin cancer, but not being exposed to it at all, out of fear or as a result of a certain lifestyle, could increase the risk of cardiovascular disease.”
The investigation appears in the Journal of Investigative Dermatology.
