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Relationship between cumulative ultraviolet exposure and cognitive function in a rural elderly Chinese population
Shimeng Xin1, Dechun Luan2, Xue Wang1
1School of Public Health, China Medical University, Shenyang, China.
International Journal of Geriatric Psychiatry
|May 24, 2018
Summary
Higher cumulative ultraviolet (UV) exposure, a proxy for vitamin D status, was linked to improved cognitive function in older Chinese adults. This suggests a potential protective effect of long-term sun exposure on brain health in this population.
Area of Science:
- Gerontology
- Nutritional Neuroscience
- Dermatology
Background:
- Inconsistent findings exist regarding the relationship between vitamin D and cognitive function.
- Cumulative ultraviolet (UV) exposure can serve as a proxy for long-term vitamin D status.
Purpose of the Study:
- To investigate the association between cumulative UV exposure and global cognitive function in elderly Chinese individuals.
- To explore the potential role of long-term vitamin D status, indicated by UV exposure, in cognitive health.
Main Methods:
- 641 elderly Chinese participants (≥60 years) were recruited.
- Cognitive function was assessed using the Montreal Cognitive Assessment-Beijing version (MoCA-BJ).
- Cumulative UV exposure was estimated by comparing skin grading from UV-exposed and UV-protected sites.
Main Results:
- A high cumulative UV exposure level was significantly associated with better cognitive function (OR=0.643, 95% CI=0.427-0.969) after adjusting for multiple covariates.
- Skin-grade differences correlated with self-reported time spent outdoors.
- Participants were categorized into low, medium, and high UV exposure groups based on skin grading.
Conclusions:
- Increased cumulative UV exposure is associated with enhanced cognitive function in elderly adults.
- Long-term UV exposure may play a beneficial role in maintaining cognitive health in older populations.
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