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Masks don't impair lung function during physical activity, study finds

Date:
November 16, 2020
Source:
University of California - San Diego
Summary:
While they might feel uncomfortable, facemasks do not significantly change the actual work of breathing or the flow of oxygen and carbon dioxide when worn while exercising, researchers report.
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FULL STORY

Wearing a facemask helps limit the spread of COVID-19 by reducing respiratory droplets and aerosols spewed into the air when people breathe, talk, laugh, sneeze or cough. But the physical barrier created by masks has prompted concerns that they might impair the cardiopulmonary system by making it harder to breathe, by altering the flow of inhaled oxygen and exhaled carbon dioxide and by increasing dyspnea -- a medical term that describe shortness of breath or difficulty breathing, especially during physical activity.

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In a new study, published November 16, 2020 in the Annals of the American Thoracic Society, a team of American and Canadian researchers concluded that while sensations of dyspnea might increase, there is little empirical evidence that wearing a facemask significantly diminishes lung function, even when worn during heavy exercise.

"There might be a perceived greater effort with activity, but the effects of wearing a mask on the work of breathing, on gases like oxygen and CO2 in blood or other physiological parameters are small, often too small to be detected," said the study's first author Susan Hopkins, MD, PhD, professor of medicine and radiology at University of California San Diego School of Medicine.

"There's also no evidence to support any differences by sex or age in physiological responses to exercise while wearing a facemask," added Hopkins, who specializes in exercise physiology and the study of lungs under stress.

The single exception, the authors note, may be persons with severe cardiopulmonary disease in which any added resistance to breathing or minor changes in blood gases could prompt dyspnea great enough to affect exercise capacity.

"In such cases, these individuals might feel too uncomfortable to exercise, and that should be discussed with their doctor," Hopkins said. "However, the fact that these individuals are at great risk should they contract COVID-19 must also be considered"

The researchers came to their conclusions following a review of all known scientific literature published that examined the effects of various facemasks and respiratory loading devices on physiological and perceptual responses to physical activity. These studies assessed multiple factors, such as work of breathing (the quantified energy expended to inhale and exhale), arterial blood gases, effects on muscle blood flow and fatigue, cardiac function and flow of blood to the brain.

For healthy persons, the effects of wearing a mask on these physiological markers were minimal, no matter what type of mask was worn or the degree of exercise. The authors also said age played no significant influencing role among adults. Gender differences were deemed inconsequential.

"Wearing a facemask can be uncomfortable," said Hopkins. "There can be tiny increases in breathing resistance. You may re-inhale warmer, slightly enriched CO2 air. And if you're exercising, the mask can cause your face to become hot and sweaty.

"But these are sensory perceptions. They do not impact cardiopulmonary function in healthy people. So while dyspnea might be increased with a mask, you have to weigh that against the reduced risk of contracting COVID-19, knowing that the physiology is essentially unchanged."

Co-authors include: Paolo B. Dominelli, University of Waterloo, Ontario, Canada; Christopher K. Davis, UC San Diego and Rady Children's Hospital-San Diego; Jordan Guenette and William Sheel, University of British Columbia; Andrew M. Luks and Erik R. Swenson, University of Washington; Yannick Molgat-Seon, University of Winnipeg, Manitoba, Canada; Rui Carlos Sá, UC San Diego; and Michael K. Stickland, University of Alberta, Edmonton, Canada.

Funding for this research came, in part, from the National Institutes of Health (grants HL-119201, HL-129990), the Canadian Institutes of Health Research and the Natural Sciences and Engineering Council of Canada.

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Story Source:

Materials provided by University of California - San Diego. Original written by Scott LaFee. Note: Content may be edited for style and length.


Journal Reference:

  1. Susan R Hopkins, Paolo B Dominelli, Christopher K Davis, Jordan A. Guenette, Andrew M Luks, Yannick Molgat-Seon, Rui Carlos Sá, A. William Sheel, Erik R Swenson, Michael K Stickland. Facemasks and the Cardiorespiratory Response to Physical Activity in Health and Disease. Annals of the American Thoracic Society, 2020; DOI: 10.1513/AnnalsATS.202008-990CME

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University of California - San Diego. "Masks don't impair lung function during physical activity, study finds." ScienceDaily. ScienceDaily, 16 November 2020. <www.sciencedaily.com/releases/2020/11/201116184442.htm>.
University of California - San Diego. (2020, November 16). Masks don't impair lung function during physical activity, study finds. ScienceDaily. Retrieved August 12, 2021 from www.sciencedaily.com/releases/2020/11/201116184442.htm
University of California - San Diego. "Masks don't impair lung function during physical activity, study finds." ScienceDaily. www.sciencedaily.com/releases/2020/11/201116184442.htm (accessed August 12, 2021).

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