Depressive symptoms and autonomic nervous system dysfunction in an elderly population-based study: the PROOF study

Area of Science:

• Gerontology
• Cardiology
• Psychiatry

Background:

• Investigating the link between depressive symptoms and autonomic nervous system (ANS) function in elderly individuals.
• Assessing both current depressive symptoms and a history of depression.
• Focusing on community-dwelling residents aged 65 years and older.

Purpose of the Study:

• To determine the relationship between depressive symptoms (current and historical) and ANS activity.
• To evaluate ANS function using long-term heart rate variability and baroreflex sensitivity.
• To analyze these associations in an elderly population.

Main Methods:

• Utilized data from the Proof cohort Study, including 823 participants aged 65+.
• Assessed depressive symptoms via self-report and evaluated ANS activity using 24-hour heart rate variability and baroreflex sensitivity.
• Performed cross-sectional analyses to examine the association between depression status and ANS parameters.

Main Results:

• Subjects with current depressive symptoms or a history of depression exhibited lower heart rate variability measures (LF, VLF, LF/HF ratio).
• These findings were independent of antidepressant medication use.
• The association between depressive symptoms and a lower LF/HF ratio remained significant after adjusting for gender and physical activity.

Conclusions:

• Current depressive symptoms are associated with reduced autonomic nervous system performance in the elderly.
• A history of depression may have long-term implications for autonomic nervous system activity later in life.
• Depressive symptoms should be considered a factor in cardiovascular risk assessment among older adults.