Masks may reduce the ability to breathing comfortably during exercise,the World Health Organisation (WHO) has warned.
WHO gave the warning on Wednesday in an update of its Coronavirus disease (COVID-19) advice for the public: Myth busters.
It said that sweat could make the mask become wet more quickly which made it difficult to breathe and would promote the growth of microorganisms.
“The important preventive measure during exercise is to maintain physical distance of at least one metre from others,” it said.
The health agency said that the prolonged use of medical masks when properly worn, did not cause Carbon dioxide (CO2) intoxication nor oxygen deficiency.
It, however, noted that the prolonged use of medical masks could be uncomfortable.
“While wearing a medical mask, make sure it fits properly and that it is tight enough to allow you to breathe normally.
“Do not re-use a disposable mask and always change it as soon as it gets damp.
“Medical masks (also known as surgical masks) are flat or pleated; they are affixed to the head with straps or have ear loops,” it said.