CARDIAC HEALTH

Scientists have found that a little sunshine could be good for your heart.

Even a short, sharp blast from a tanning lamp can cause blood pressure to fall, a study has shown.

The results suggest that well-meaning advice to avoid the sun to protect against skin cancer may in fact be raising the odds of heart problems.

With high blood pressure trebling the chance of heart attacks and strokes, researchers believe the benefits of sunlight may outweigh the risks of skin cancer.

The study carried out by researchers at Edinburgh and Southampton Universities exposed the skin of 24 healthy young men to a sun lamp for 20 minutes and measured their blood pressure.

Diastolic pressure (the lower of the two figures in a blood pressure reading) dropped significantly and remained low for at least 30 minutes after the lamp was switched off. Studies into sunlight usually credit Vitamin D with any health benefits, but in this case a different compound was found to be at work.

It is thought the UVA rays emitted by the lamp triggered the release of a compound called nitric oxide from the skin. This then travelled to the blood vessels and relaxed them, causing blood pressure to fall.

The researchers first wrote in the Journal of Investigative Dermatology and stated that even a small drop in blood pressure can cut the risk of heart attacks and strokes.

The findings could be significant as they could help explain why rates of heart disease go up during the winter months and why cardiac health is worse in countries further from the equator.

Professor Martin Feelisch, from the Faculty of experimental medicine at Southampton University, said it would be important to check to establish whether the benefits are not just limited to a quick blast of UV light in a laboratory but whether they persist in the real world too.

If the sun’s rays do prove to be beneficial for the heart, health advice given on tanning is likely to be reviewed.

Despite the concern about skin cancer, heart disease is a far bigger killer. In Britain, skin cancer kills 2,800 people a year while heart disease and strokes claim more than 160,000 lives annually and every seven minutes someone in the UK dies from a heart attack.

Professor Feelisch said that fear of skin cancer has left some people scared of the sun. Others may not be getting enough sunlight because they spend their work and leisure time indoors.

He added:

… 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.

… We are concerned that well-meaning advice to reduce comparatively low numbers of deaths from skin cancer may inadvertently increase the risk of death from heart disease and stroke.

Meanwhile, sunshine can also ease the early stages of multiple sclerosis, a separate study found.

MS is a neurological condition affecting around 100,000 people in the UK, causing problems with vision, balance and the bladder.

Research by Harvard School of Public Health found that boosting vitamin D could reduce the severity of MS.

Alberto Ascherio, professor of epidemiology and nutrition at Harvard, said:

… Because low vitamin D levels are common and can be easily and safely increased, these findings may contribute to better outcomes for MS patients.