Depression and Cognitive Dysfunction in Older U.S. Military Veterans: Moderating Effects of BDNF Val66Met...

Area of Science:

• Neuroscience
• Gerontology
• Genetics

Background:

• Depression is linked to cognitive decline in older adults.
• Factors moderating this association, particularly in veteran populations, require further investigation.

Purpose of the Study:

• To examine the effects of depression, brain-derived neurotrophic factor (BDNF) Val66Met genotype, and physical exercise on cognitive functioning in older U.S. military veterans.
• To understand how these factors interact to influence cognitive performance.

Main Methods:

• Utilized data from 1,386 older European-American U.S. military veterans.
• Employed web-based surveys and cognitive assessments.
• Conducted analyses of covariance to evaluate the effects of depression, BDNF Met allele carrier status, and physical exercise.

Main Results:

• Depressed veterans exhibited worse cognitive function compared to non-depressed veterans.
• The BDNF Val66Met genotype and physical exercise moderated the association between depression and cognitive function.
• Physical exercise showed a protective effect, particularly in depressed veterans carrying the Met allele, improving subjective and objective cognitive measures.

Conclusions:

• Depression is associated with cognitive decrements in older veterans, moderated by BDNF genotype and physical activity.
• Interventions promoting physical exercise could be crucial for preserving cognitive function in at-risk veteran populations.