Benefits of Wearing Particulate-Filtering Respirators

Research studies on wood smoke and other air pollution.

Benefits of Wearing Particulate-Filtering Respirators

Postby Wilberforce » Tue Aug 30, 2016 4:19 pm

http://ehp.niehs.nih.gov/ehp73/
DOI:10.1289/EHP73

Cardiovascular Benefits of Wearing Particulate-Filtering Respirators: A Randomized Crossover Trial
Jingjin Shi,1 Zhijing Lin,1 Renjie Chen,1,2 Cuicui Wang,1 Changyuan Yang,1 Jing Cai,1 Jingyu Lin,3 Xiaohui Xu,4 Jennifer A. Ross,5 Zhuohui Zhao,1 and Haidong Kan1,2

Background: Practical approaches to protect the individual health from ambient particulate matter are urgently needed in developing countries. The evidence is limited on the health benefits of wearing particulate-filtering respirators.

Objectives: To evaluate the short-term cardiovascular health effects of wearing respirators in China.

Methods: A randomized crossover trial was performed in 24 healthy young adults in Shanghai, China in 2014. The subjects were randomized into 2 groups and wore alternately a particulate-filtering respirator for 48 hours with a 3-week washout interval. Heart rate variability (HRV) and ambulatory blood pressure (BP) were continuously monitored during the 2nd 24 hours in each intervention. Circulating biomarkers were measured at the end of each intervention. Linear mixed-effect models were applied to evaluate the effects of wearing respirators on health outcomes.

Results: During the intervention periods, the mean daily average concentration of PM2.5 was 74.2 µg/m3. Compared with the absence of respirators, wearing respirators was associated with a decrease of 2.7 mmHg (95% confidence intervals(CI): 0.1, 5.2 mmHg) in systolic BP and increases of HRV parameters, including 12.5%(95% CI: 3.8%, 21.2%) in high frequency(HF) power, 10.9%(95% CI: 1.8%,20.0%) in the root mean square of the successive differences, and 22.1%(95%CI:3.6%,40.7%) in the percentage of successive NN intervals differing by>50ms. The presence of respirators was also associated with a decrease of 7.8% (95% CI: 3.5%, 12.1%) in the ratio of low frequency(LF)/HF power.

Conclusions: Short-term wearing of particulate-filtering respirators may obtain cardiovascular benefits in improving autonomic nervous function and reducing BP.
• The Surgeon General has determined that there is no safe level of exposure to ambient smoke!

• If you smell even a subtle odor of smoke, you are being exposed to poisonous and carcinogenic chemical compounds!

• Even a brief exposure to smoke raises blood pressure, (no matter what your state of health) and can cause blood clotting, stroke, or heart attack in vulnerable people. Even children experience elevated blood pressure when exposed to smoke!

• Since smoke drastically weakens the lungs' immune system, avoiding smoke is one of the best ways to prevent colds, flu, bronchitis, or risk of an even more serious respiratory illness, such as pneumonia or tuberculosis! Does your child have the flu? Chances are they have been exposed to ambient smoke!
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