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Usually, we think that blue light is harmful to our health, but studies have found that it can help control hypertension.
When it comes to blue light, we usually think of it as harmful to our eyes, sleep, and so on. However, a research team at the University of Surrey in the UK found that it's useful for controlling hypertension. Hypertension is the leading cause of stroke and cardiovascular disease. In the traditional medical field, blood pressure-lowering methods include medication, diet, exercise, etc. This finding has an important implication for the field of medicine.
The study conducted a blue light test on 14 healthy male volunteers. On the first day of the experiment, the volunteers received 30 minutes of illumination of visible blue light at 450 nm. As a contrast, they were also illuminated by artificial light without blue-spectrum for 30 minutes on the second day. The scientists collected, analyzed, and compared data on blood pressure, arterial stiffness, vasodilation, and plasma nitric oxide levels of volunteers. Finally, it was concluded that the systolic blood pressure of the volunteers on the first day of blue light decreased by 8 mmHg on average, while the non-blue-spectrum light did not affect blood pressure. The researchers said the effect of blue light is similar to that of antihypertensive drugs. Besides, researchers found that blue light promotes the release of nitric oxide from the skin and allow it to enter the bloodstream, reducing blood vessel stiffness, increasing blood flow and lowering blood pressure.
Professor Christian Heiss of Surrey University said that blue light therapy is a new treatment that deserves research and development. With the help of LED technology, precise control of the blue light spectrum can be realized. This treatment method is especially helpful for people such as the elderly who do not easily control their blood pressure.
The report of the experiment has been published in the European Journal of Preventative Cardiology.
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