Increased resting heart rate with pollutants in a population based study.

Area of Science:

• Environmental Health
• Cardiovascular Epidemiology
• Public Health

Background:

• Air pollution is a known risk factor for cardiovascular mortality.
• Autonomic nervous system dysfunction may mediate the link between pollution and cardiac arrhythmias.
• This study examines the association between specific air pollutants and resting heart rate (RHR).

Purpose of the Study:

• To investigate the relationship between concentrations of sulfur dioxide (SO(2)), ozone (O(3)), and nitric dioxide (NO(2)) and resting heart rate (RHR).
• To explore potential pathophysiological mechanisms linking air pollution to cardiovascular events through heart rate variability.

Main Methods:

• A population-based study of 863 middle-aged men and women in Toulouse.
• Resting heart rate (RHR) measured after a five-minute rest in a sitting position.
• Multivariate logistic regression analyses adjusted for various cardiovascular risk factors and environmental variables.

Main Results:

• An increase in nitric dioxide (NO(2)) concentration was significantly associated with higher RHR (odds ratio [OR] 1.14, p=0.003).
• Sulfur dioxide (SO(2)) showed a borderline significant association with higher RHR (OR 1.16, p=0.05).
• Cumulative exposure to ozone (O(3)) over three days was negatively associated with RHR (p=0.02).

Conclusions:

• Elevated resting heart rate (RHR) may indicate cardiac rhythm changes related to air pollution exposure.
• These findings suggest a potential role for heart rate alterations in the pathway from air pollution to cardiovascular mortality.
• Further research into autonomic nervous system responses to air pollutants is warranted.