Key result
Exposure to concentrated PM 2.5 decreased SDNN by 15% initially and up to 60% by the end of a 5-hour exposure in spontaneously hypertensive rats.
Why the study?
Does concentrated PM 2.5 exposure reduce heart rate variability in spontaneously hypertensive rats?
Does concentrated PM 2.5 exposure reduce heart rate variability in spontaneously hypertensive rats?
Acute exposure to concentrated PM 2.5 decreases heart rate variability in spontaneously hypertensive rats, highlighting the cardiovascular toxicity of particulate matter.
Answers are grounded in this paper and cite their sources.
May indicate autonomic effects of PM2.5 in hypertensive models; leaves open translation to human cardiovascular risk.
Effects of Concentrated Ambient Particles on Heart Rate Variability in Spontaneously Hypertensive Rats: Chuen‐Chau Chang, et al. Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University, Taiwan —In the present study, the cardiovascular toxicity of PM 2.5 was determined in spontaneously hypertensive (SH) rats using the standard deviation of normal‐to‐normal intervals (SDNN) and root mean square of successive differences of adjacent normal‐to‐normal intervals (RMSSD) as outcome measurements. Four SH rats implanted with radiotelemetry transmitters were repeatedly exposed to concentrated PM 2.5 in nose‐only exposure chambers. Gravimetric analysis revealed the mean post‐concentrating mass concentration of particles during the 5 h of exposure was 202 µg/m 3 . Using each animal as its own control and linear mixed‐effects model, to adjust for circadian nature and individual differences, we found that SDNN decreased by 15% initially then gradually decreased to 60% of the initial value at the end of exposure. Our results indicate that concentrated PM 2.5 may decrease SDNN on SH rats during PM exposure. The study also showed that SDNN is more sensitive to PM induced effects than RMSSD.
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Chang et al. (2005) studied Spontaneously hypertensive (n=4). Concentrated PM 2.5 vs. Each animal as its own control was evaluated on Heart rate variability (SDNN and RMSSD) (60% decrease in SDNN). Exposure to concentrated PM 2.5 decreased SDNN by 15% initially and up to 60% by the end of a 5-hour exposure in spontaneously hypertensive rats.
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