PM2.5 exposure was significantly associated with acute HRV reductions within 180 minutes, with SDNN decreasing by 8.04% (95% CI: 11.10% to -4.88%) at the initial lag following exposure.
Observational (n=73)
Does ultra-short-term exposure to PM2.5 reduce heart rate variability in susceptible and vulnerable individuals?
Ultra-short-term exposure to PM2.5 is associated with immediate reductions in heart rate variability, with more pronounced effects occurring during nighttime and in patients with arrhythmia.
Effect estimate: -8.04% decrease (95% CI 11.10% to -4.88%)
While epidemiological studies have examined the effects of exposure to particulate matter with diameter ≤2.5 μm (PM 2.5 ) on heart rate variability (HRV) on a daily basis, there is a need for more granular data to better understand the ultrashort-term effects of PM 2.5 on HRV. This study aimed to investigate the minute-level association between PM 2.5 exposure and HRV using real-time personal monitoring data, focusing on time-lagged effects in vulnerable populations. We collected minute-by-minute data of PM 2.5 and HRV using a wearable device from 73 individuals, with 3 days of continuous observations per participant (total 315,360 observations). PM 2.5 and electrocardiogram (ECG)-derived HRV indices, including the standard deviation of normal-to-normal intervals (SDNN) and the root mean square of successive differences (RMSSD), were continuously measured for five days using wearable devices. Distributed lag non-linear and linear mixed-effects models were used to evaluate exposure-response relationships. PM 2.5 exposure was significantly associated with acute HRV reductions within 180 min. SDNN decreased by −8.04 % (95 % CI: 11.10 % to −4.88 %) at the initial lag following exposure, peaking at approximately 49 min and gradually attenuating thereafter, and RMSSD decreased by −4.17 % (95 % CI: 7.23 % to −1.00 %) at the initial lag, with a similar attenuation pattern beyond 38 min. More pronounced effects occurred during nighttime (18:00–06:00), with SDNN decreasing by −13.9 % (95 % CI: 17.81 % to −9.80 %) and RMSSD by −7.43 % (95 % CI: 11.13 % to −3.57 %). Females exhibited a more immediate HRV decline at the initial lag (SDNN: 10.24 %, RMSSD: 6.39 %) compared to males (SDNN: 4.44 %, RMSSD: 8.61 %). Patients with arrhythmia showed the greatest reductions at the initial lag (SDNN: 11.42 %, RMSSD: 15.95 %). This study highlights the immediate autonomic impact of PM 2.5 exposure, emphasizing its differential effects by time of day, sex, and health status. Findings underscore the importance of personal air pollution monitoring and targeted interventions for high-risk populations.
Park et al. (Wed,) conducted a observational in Susceptible and vulnerable individuals (n=73). PM2.5 exposure was evaluated on Standard deviation of normal-to-normal intervals (SDNN) (-8.04% decrease, 95% CI 11.10% to -4.88%). PM2.5 exposure was significantly associated with acute HRV reductions within 180 minutes, with SDNN decreasing by 8.04% (95% CI: 11.10% to -4.88%) at the initial lag following exposure.
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