Long-Term Metal PM2.5 Exposures Decrease Cardiac Acceleration and Deceleration Capacities in Welders.

Area of Science:

• Environmental Health
• Cardiology
• Occupational Medicine

Background:

• Particulate matter (PM2.5) exposure is a growing concern for cardiovascular health.
• Cardiac autonomic function, measured by acceleration capacity (AC) and deceleration capacity (DC), reflects the heart's ability to respond to stimuli.
• The long-term effects of occupational PM2.5 exposure on cardiac autonomic function are not well understood.

Purpose of the Study:

• To investigate the association between chronic exposure to metal particulates (PM2.5) and cardiac acceleration capacity (AC) and deceleration capacity (DC).

Main Methods:

• A cohort of 50 boilermakers had their chronic exposure index (CEI) for PM2.5 calculated over their work lives.
• Resting AC and DC were measured for each participant.
• Linear regression models were used to assess the relationship between CEI for PM2.5 and AC/DC, controlling for confounding factors.

Main Results:

• Mean CEI for PM2.5 exposure was 1.6 mg/m-work years.
• A 1 mg/m-work year increase in CEI for PM2.5 was associated with a significant decrease in resting AC (-1.03 ms).
• A similar trend was observed for DC, with a decrease of 0.67 ms, though not statistically significant in this model.

Conclusions:

• Long-term occupational exposure to metal particulates (PM2.5) is linked to reduced cardiac acceleration capacity.
• These findings suggest that chronic PM2.5 exposure may impair the heart's autonomic regulation.
• Further research is warranted to explore the clinical implications of these findings.