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The relationship between long-term sunlight radiation and cognitive decline in the REGARDS cohort study.
- Source :
-
International journal of biometeorology [Int J Biometeorol] 2014 Apr; Vol. 58 (3), pp. 361-70. Date of Electronic Publication: 2013 Jan 24. - Publication Year :
- 2014
-
Abstract
- Sunlight may be related to cognitive function through vitamin D metabolism or circadian rhythm regulation. The analysis presented here sought to test whether ground and satellite measures of solar radiation are associated with cognitive decline. The study used a 15-year residential history merged with satellite and ground monitor data to determine sunlight (solar radiation) and air temperature exposure for a cohort of 19,896 cognitively intact black and white participants aged 45+ from the 48 contiguous United States. Exposures of 15, 10, 5, 2, and 1-year were used to predict cognitive status at the most recent assessment in logistic regression models; 1-year insolation and maximum temperatures were chosen as exposure measures. Solar radiation interacted with temperature, age, and gender in its relationships with incident cognitive impairment. After adjustment for covariates, the odds ratio (OR) of cognitive decline for solar radiation exposure below the median vs above the median in the 3rd tertile of maximum temperatures was 1.88 (95 % CI: 1.24, 2.85), that in the 2nd tertile was 1.33 (95 % CI: 1.09, 1.62), and that in the 1st tertile was 1.22 (95 % CI: 0.92, 1.60). We also found that participants under 60 years old had an OR = 1.63 (95 % CI: 1.20, 2.22), those 60-80 years old had an OR = 1.18 (95 % CI: 1.02, 1.36), and those over 80 years old had an OR = 1.05 (0.80, 1.37). Lastly, we found that males had an OR = 1.43 (95 % CI: 1.22, 1.69), and females had an OR = 1.02 (0.87, 1.20). We found that lower levels of solar radiation were associated with increased odds of incident cognitive impairment.
- Subjects :
- Age Distribution
Aged
Aged, 80 and over
Climate
Female
Humans
Incidence
Longitudinal Studies
Male
Middle Aged
Radiation Dosage
Radiation Monitoring statistics & numerical data
Risk Factors
Sex Distribution
Temperature
United States epidemiology
Weather
Black or African American
Black People statistics & numerical data
Cognition Disorders ethnology
Environmental Exposure statistics & numerical data
Radiation Injuries epidemiology
Solar Energy statistics & numerical data
Sunlight
White People statistics & numerical data
Subjects
Details
- Language :
- English
- ISSN :
- 1432-1254
- Volume :
- 58
- Issue :
- 3
- Database :
- MEDLINE
- Journal :
- International journal of biometeorology
- Publication Type :
- Academic Journal
- Accession number :
- 23340910
- Full Text :
- https://doi.org/10.1007/s00484-013-0631-5