Night Light Exposure Linked to Harmful Heart Structure Changes
A new study reveals that exposure to light during the night is linked to adverse changes in heart structure and function.

KEY POINTS
- Study published in the European Heart Journal links nighttime light to heart changes.
- Research included 11,071 participants from the UK Biobank database.
- Participants wore wrist sensors for seven days and underwent heart scans three years later.
- High nighttime light exposure caused left ventricular wall thickening and reduced heart muscle expansion.
Exposure to light during the night is linked to harmful changes in heart structure and function, according to a study published in the European Heart Journal. Led by Tulane University in the United States, the study analyzed 11,071 participants from the UK Biobank database.
Participants wore wrist light sensors for seven days to record nighttime brightness levels. Three years later, they underwent cardiac magnetic resonance imaging to allow researchers to examine their heart structure and function in detail.
“This is the first study of its kind and shows that exposure to higher levels of light during the night is linked to cardiac remodeling.”
Researchers compared individuals exposed to nighttime light levels above three lux with those exposed to almost no light. The comparison showed that higher nighttime light exposure caused thickening of the left ventricular wall and reduced heart muscle expansion capacity.
Lead researcher Lu Qi noted that this cardiac remodeling weakens the heart over time and can lead to heart failure. In an accompanying article, Professor Thomas Münzel and colleagues emphasized the clinical relevance of these findings.
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