Ambient air pollution alters heart rate regulation in aged mice.

Abstract:

CONTEXT:Heart rate alterations associated with exposure to particulate matter (PM) and gaseous pollutants have been observed in epidemiological studies and animal experiments. Nevertheless, the time-lag of these associations is still unclear. OBJECTIVE:Determine the association at different time-lags between the complex mixture of ambient concentrations of PM, carbon monoxide (CO), and nitrogen dioxide (NO(2)), and markers of cardiac function in a model of aged mice. MATERIALS AND METHODS:AKR/J inbred mice were exposed to ambient air, 6 h daily for 40 weekdays. During this period, the animals' electrocardiogram (ECG), deep body temperature (Tdb), and body weight (BW) were registered, and concentrations of PM, CO, NO(2), as well as air temperature and relative humidity (RH) were measured. Data analysis included random effects models with lagged covariate methods. RESULTS:CO was significantly associated with declines in heart rate (HR) and heart rate variability (HRV), PM was significantly associated with declines in HRV and BW, and NO(2) was significantly associated with declines in HR. Some significant associations occurred in the same day (PM and HRV, PM and BW, CO and HR), whereas others were delayed by 1 to 3 days (CO and HR, CO and HRV, NO(2) and HR, PM and HRV). DISCUSSION AND CONCLUSION:Finding significant declines in heart function in aged mice associated with the combined effects of air pollutants at ambient concentrations and at different time-lags is of great importance to public health. These results further implicate the potential short term and delayed effects of air pollution on HR alterations.

journal_name

Inhal Toxicol

journal_title

Inhalation toxicology

authors

Ramos-Bonilla JP,Breysse PN,Dominici F,Geyh A,Tankersley CG

doi

10.3109/08958370903349365

subject

Has Abstract

pub_date

2010-03-01 00:00:00

pages

330-9

issue

4

eissn

0895-8378

issn

1091-7691

journal_volume

22

pub_type

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