Artificial Light And Stroke
People being continuously exposed to outdoor artificial light at night may be at a higher risk of having a stroke, a new research reviewing more than 28,000 adults in China has found.
The researchers said the excessive use of artificial light for enhancing visibility at night has resulted in about 80 per cent of the world's population living in light-polluted environments.
The team, including researchers from Zhejiang University School of Medicine, China, assessed the adults' exposure to residential outdoor nighttime light using satellite images that mapped light pollution. Cases of stroke were confirmed by the hospital medical records and the death certificates, they said.
Their analysis after following up the participants over a six-year period showed that 1,278 people developed cerebrovascular disease, including 777 ischemic (clot-caused) stroke cases and 133 hemorrhagic (bleeding) stroke cases.
The people with the highest levels of exposure to outdoor light at night were also found to have a 43 per cent increased risk of developing cerebrovascular disease compared to those with the lowest levels of exposure.
"Our study suggests that higher levels of exposure to outdoor artificial light at night may be a risk factor for cerebrovascular disease," said Jian-Bing Wang, a researcher in the department of public health and department of endocrinology of the Children's Hospital, Zhejiang University School of Medicine, Hangzhou, China.
"Therefore, we advise people, especially those living in urban areas, to consider reducing that exposure to protect themselves from its potential harmful impact," said Wang, one of the corresponding authors of the study published in the journal 'Stroke'.
Artificial Light At Night = Stroke
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