Do Runners Need to Wear Masks?


Jane Rosen began yelling sometime in April. By May, it had become routine. The incidents usually occur near her minivan, which she parks alongside Central Park in New York City.

As she attempts to enter or exit the vehicle, a cyclist or a runner will whiz by, so close she can practically smell them. “I scream, ‘Where is your mask?,’” said Ms. Rosen, 73.

Her daughter warned her that these confrontations could end badly. But it feels worth it, she said, because lives are at stake. She’s had about 18 such confrontations. The figure would be higher, she said, if she ventured out more often.

Melissa Mayen, a high school senior in Washington, D.C., had also been avoiding going outside. Then in mid-May, she set out for a ride for the first time in nearly a month.

She was startled when a man, walking across the street, yelled something about a mask. “I almost fell off my bike,” she said. She owns one mask, which her father brought her from a construction site where he works. Aside from the fact that it’s so thick that she can barely breathe in it, she tries to preserve it for higher-risk situations. “If you are yelling at someone to wear a mask, then give them a mask,” she said.

And few activities seem to have incited more debate than exercise: walkers, cyclists, runners, skaters — everyone seems to have contradicting interpretations of the science and etiquette around how to behave outside.

Not necessarily. When cities and states started urging people to wear masks to reduce transmission of the coronavirus, some made exceptions for exercising. Carry a mask, many seemed to say, but if you’re by yourself on an empty street, you don’t have to wear it.

Since mid-May, Los Angeles has required residents to put on a face covering upon leaving home. But masks are not required while running and biking so long as distance is maintained — though they should be carried, the county and city later clarified.

It can be really hard to run in a mask.

Many runners are put off by how challenging it is to inhale as their heart rate rises. It can be much more difficult than walking in a mask.

“It’s harder to breathe, and it’s a lot more clammy,” said Gaston Ly, a store manager at Running Room in Honolulu.

Others forgo one because, even as the virus spreads, masks have not been widely adopted in their communities.

“Oh gosh no!” said Larry Holt, the owner of Ken Combs Running Store in Louisville, Ky., when asked if runners there wore masks. “That’s the craziest thing I’ve ever heard of in my life.”

Even in Hong Kong, a city so committed to face coverings in public that it has been widely praised as a model, there is little expectation that runners will wear masks, said Brian Woo, a founder of a running group there. “I assume it’s just understood that running is not a time for wearing masks,” he said.

There is no scientific consensus around the importance of wearing a mask while exercising, primarily because so little relevant research has been completed.

Donald Milton, a professor of environmental health at the University of Maryland School of Public Health who has studied masks’ ability to block respiratory droplets, suggests their value depends on location. “Outdoors is relatively safe, and masks would only be important if you are exercising in crowded areas or indoors in space shared with other people,” he said.

It would most likely occur while you were stopped talking to them, said Julian Tang, a virologist and a professor at the University of Leicester in England. He thinks the risk of infection from quickly passing someone is low, because the “massive air volume will dilute any exhaled virus and the wind may carry it away.”

For a few days, every social media platform seemed to be oozing with the same terrifying graphic: two runners, one spewing a colorful cloud — many interpreted it to be coronavirus — on a man behind him.

One useful takeaway, both the study’s authors and several researchers not involved in it said: It’s best to avoid running or biking directly behind someone for a prolonged period.

Stranger sweat is disgusting. But it’s not among the bodily fluids that the C.D.C. warns transmits the coronavirus.

Spitting is not only disgusting but also dangerous, as saliva can contain viral droplets. Runners, cyclists, skaters, walkers — don’t do it! (Or at least not around others.)

Avoid popular routes and times, suggests Douglas Nicaragua, the owner of Go Run in Miami. He advises taking a mask, even if you don’t expect to cross paths with anyone. If you see someone, put it on.

“Over time, you’ll get used to it,” said Joey Ta, a competitive endurance athlete in Los Angeles who recently started wearing a mask.

And whether you wear a mask or not, pay attention to the position of people around you. Dr. Benjamin D. Levine, a professor of internal medicine at UT Southwestern Medical Center and Texas Health Presbyterian Dallas, is advising the U.S. track and field team on how to train safely. He urges focusing on what he calls the four Ds: “double the distance” from six to 12 feet and “don’t draft,” meaning “don’t run or cycle directly behind someone so you are continually running into and breathing their expired air.”

No. The idea that wearing a mask mimics high-altitude conditions is a myth, Dr. Levine said.

“I don’t understand how people can’t understand that this is about more than just a mask,” said Ms. Rosen, the New York woman who has taken to yelling at runners.

She said her confrontations were driven by a sense of duty to protect not only herself, but also her neighbors.


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