Assessing the Relationship between Vitamin D Status and Impairments in Cognitive and Physical Performance in Older...

Area of Science:

• Gerontology
• Nutritional Neuroscience
• Public Health

Background:

• Vitamin D deficiency is linked to increased fall risk in older adults.
• Deficiency is associated with gait and cognitive impairments, known fall risk factors.
• Limited research exists on vitamin D's role in cognitive function related to mobility.

Purpose of the Study:

• To investigate the association between vitamin D status and age-related mobility changes.
• To examine the role of higher-order cognitive function using dual-task testing.
• To evaluate vitamin D's impact on cognitive-motor interactions in older adults.

Main Methods:

• Cross-sectional study of 97 community-dwelling older adults (age > 55) in Miami, FL.
• Assessed serum vitamin D levels, cognitive function (counting rates), and mobility (gait velocity) using dual-task tests.
• Statistical analyses included Spearman correlations, t-tests, ANOVAs, and logistic regressions (α=0.05).

Main Results:

• No significant association found between vitamin D insufficiency and gait velocity.
• Slower single and dual-task counting rates were significantly associated with vitamin D insufficiency (P<0.05).
• Vitamin D status did not significantly affect dual-task physical performance in gait velocity or counting rate.

Conclusions:

• Vitamin D insufficiency is associated with executive dysfunction, indicated by impaired counting backward task performance.
• Executive dysfunction may mediate the link between low vitamin D and increased fall risk in the elderly.
• Cognitive function appears more influential than motor function in vitamin D's effect on falls.