<Anchor>

In this succession of students hiding in China, I am confused about how dangerous it is to wear a mask and exercise, and what to use if I use it.

Cho Dong-chan is a medical journalist.

<Reporter> He is a

healthy male in his 20s.

Walk slowly at 3 km per hour, then increase your speed to 6 km per hour to measure your heart rate, blood pressure, and blood oxygen saturation.

This time, I performed the same measurement using a KF94 high-performance mask that prevents 94% of fine dust.

When walking slowly, there was no difference, but as I walked quickly, systolic blood pressure rose from 126 to 141, and arterial oxygen saturation also decreased from 96% to 95%, though it was fine.

[Byeon Sky (27 years old) / Seoul Dongdaemun: It seems that if you wear a mask and walk quickly, you tend to breathe more.]

National Medical University of Singapore has 20 healthy pregnant women wearing N95 masks and doing a quick walk. Looking at it, the average one-time breath volume decreased by 23%, and the number of breaths per minute decreased by 25.8%.

Wearing a high-functioning mask and doing your daily life is nothing more than a reward for your body, but intense exercise can harm your lungs and heart beyond your body's reward.

The risks are even greater if you exercise and the mask gets wet with sweat.

[Jin-Ha Yun / Professional Medicine, Yonsei University School of Medicine: When the mask gets wet, the ability to breathe is reduced by 10%, so 20%, because it closes the pores.

You can see that only 60-70% of your cardiopulmonary abilities are exerted.] It is safe to wear a mask that is easy to breathe because it does not have a sufficient distance or does not have a high function without wearing a mask when exercising vigorously.

(Video coverage: Jang Un-suk, Video editing: Sung-hoon Jeong)