Sunlight exposure and cardiovascular risk factors in the REGARDS study: a cross-sectional split-sample analysis

Area of Science:

• Environmental Health
• Cardiovascular Disease Epidemiology
• Nutritional Epidemiology

Background:

• Previous studies suggest links between vitamin D, sunlight, and cardiovascular outcomes.
• The relationship between sunlight exposure and cardiovascular risk factors has not been extensively studied.

Purpose of the Study:

• To investigate the association between sunlight radiation exposure and cardiovascular risk factor status.
• To determine if increased sunlight exposure correlates with improved cardiovascular health markers.

Main Methods:

• Utilized residential histories and environmental data to estimate previous-year sunlight radiation exposure for 17,773 participants (aged 45+).
• Employed logistic regression models to analyze relationships between sunlight exposure quartiles and cardiovascular risk factors.
• Split the sample into exploratory and confirmatory halves for robust analysis.

Main Results:

• The lowest quartile of sunlight exposure was associated with lower high-density lipoprotein (HDL) levels compared to the highest quartile.
• Lower sunlight exposure was linked to higher systolic blood pressure in some models, but not consistently across all analyses.
• Observed associations were generally weak, indicating a limited impact.

Conclusions:

• Lower long-term sunlight exposure may be associated with reduced high-density lipoprotein (HDL) levels.
• The observed associations between sunlight exposure and cardiovascular risk factors were weak.
• Further research is needed to determine if sunlight exposure influences cardiovascular outcomes through these risk factors.