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New Study: Mask Wearing Causes “Cardiopulmonary Overload”

The authors state that the habitual wearing of an N95 mask contributes to severe health outcomes, including cardiovascular diseases and increased mortality.

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SHANGHAI, CHINA — Wearing masks of the type that have commonly been used to allegedly protect against COVID-19 is severely damaging to human health. At least if we are to trust a Chinese research letter by scientists at Shanghai Jiaotong University published in the Journal of the American Medical Association on June 9.

In the study Evaluation of Mask-Induced Cardiopulmonary Stress – A Randomized Crossover Trial, the researchers recruited a group of 30 healthy volunteers who spent their time from March to September 2022 “in a metabolic chamber to strictly control daily calorie intake and physical activity levels.”

Participants were randomly assigned to do tasks with and without an N95 mask for 14 hours, during which they exercised for 30 minutes in the morning and afternoon using an ergometer at 40 percent (light intensity) and 20 percent (very light intensity) of their maximum oxygen consumption levels, the paper states.


So, what was the impact on the mask wearers’ health? Not good at all:

“The findings contribute to existing literature by demonstrating that wearing the N95 mask for 14 hours significantly affected the physiological, biochemical, and perception parameters. The effect was primarily initiated by increased respiratory resistance and subsequent decreased blood oxygen and pH, which contributed to sympathoadrenal system activation and epinephrine as well as norepinephrine secretion elevation,” the scientists write.

“Although healthy individuals can compensate for this cardiopulmonary overload, other populations, such as elderly individuals, children, and those with cardiopulmonary diseases, may experience compromised compensation. Chronic cardiopulmonary stress may also increase cardiovascular diseases and overall mortality,” says the Chinese doctors.


A randomized controlled trial of mask use with over 6,000 participants was carried out in Denmark in early 2021. It was widely suppressed after publication in March that same year. The results did not correspond to the official pro-masking narrative.

In the Danish study, the authors stated:

“Our results suggest that the recommendation to wear a surgical mask when outside the home among others did not reduce, at conventional levels of statistical significance, the incidence of SARS-CoV-2 infection in mask wearers in a setting where social distancing and other public health measures were in effect, mask recommendations were not among those measures, and community use of masks was uncommon.”