Does autonomic function link social position to coronary risk? The Whitehall II study

Area of Science:

• Cardiovascular Epidemiology
• Autonomic Neuroscience
• Social Determinants of Health

Background:

• Chronic stress and low social position are associated with adverse metabolic outcomes, potentially explaining higher coronary risk in lower social strata.
• The autonomic nervous system's role in mediating stress responses and metabolic health is increasingly recognized.

Purpose of the Study:

• To investigate the hypothesis that autonomic nervous system dysfunction links social position to coronary risk factors.
• To examine the association between social position, autonomic function, behavioral factors, and metabolic syndrome in a healthy occupational cohort.

Main Methods:

• The Whitehall II study included 2197 male civil servants aged 45-68.
• Social position was assessed by employment grade; autonomic function was measured using heart rate variability (HRV) recordings.
• Psychosocial factors (job control), behavioral factors (smoking, diet, etc.), and metabolic syndrome components were evaluated.

Main Results:

• Lower employment grade was significantly associated with reduced heart rate variability (HRV), indicating impaired autonomic function (P<0.02).
• Adverse behavioral and psychosocial factors, including low job control, were also linked to lower HRV (P<0.03).
• HRV demonstrated strong linear associations with metabolic syndrome components (P<0.001); the social gradient in metabolic syndrome was explained by autonomic function, behavioral factors, and job control.

Conclusions:

• Chronically impaired autonomic function may serve as a crucial link between social position and various components of coronary risk.
• These findings suggest that autonomic dysfunction contributes to health disparities observed across different social strata.