Race differences in age-trends of autonomic nervous system functioning

Area of Science:

• Physiological responses to stress
• Autonomic nervous system functioning
• Health disparities research

Background:

• Autonomic nervous system (ANS) functioning, measured by heart rate variability (HRV), changes with age.
• Previous research suggests potential racial differences in health trajectories, possibly linked to chronic stress.

Purpose of the Study:

• To investigate race-based differences in the age-related trends of autonomic nervous system functioning.
• To examine how socioeconomic status (SES) influences these age-related trends.

Main Methods:

• Utilized a national dataset including 204 African Americans and 833 Whites aged 34-83 years.
• Measured baseline heart rate variability (HRV) and HRV reactivity during cognitive stress tasks using electrocardiograph (ECG) recordings.
• Analyzed age-trends in HRV and HRV reactivity, controlling for socioeconomic status (SES).

Main Results:

• Age-trends in HRV reactivity were steeper in African Americans and lower SES individuals compared to Whites and higher SES individuals.
• Age-trends in baseline HRV varied by SES but did not show significant differences based on race.

Conclusions:

• Findings for HRV reactivity support hypotheses that African Americans experience higher stress and faster health decline.
• The study highlights the role of social stress in health disparities, particularly concerning autonomic nervous system aging.