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According to foreign media reports, the new coronavirus is so difficult to control because many people still do not take sanitary measures to limit the spread. Wearing masks, washing hands frequently, and maintaining social distancing can reduce the spread of this virus. Also, avoiding indoor spaces as much as possible and ventilating homes and offices can further reduce the risk of infection.
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These measures must be respected at all times and carried out simultaneously. If you don’t maintain enough social distance, not even wearing a mask and washing your hands frequently will suffice. Unfortunately, masks have become a political issue from the time health experts began advising the public to wear masks. Anti-masks have come up with many reasons for ignoring the requirement to wear a mask, including a nonsensical statement.
Some people claim that wearing a mask will limit oxygen intake and lead to hypoxia. Long before the pandemic, there was evidence that masks did not reduce oxygen levels. Medical personnel wear masks in hospital, even during long-term operations, but have not suffered from hypoxia. Masks allow oxygen to pass through, but at the same time block pathogens in the air. Doctors and nurses wear masks to protect patients during surgery, but also to protect themselves.
In addition, the doctors also conducted some experiments to show that the masks will not affect oxygenation. A doctor wears several masks at the same time. Another person ran a marathon wearing a mask. All show that the oxygen saturation has not decreased at all. Now, a more scientific study could convince those who still do not believe that masks are safe.
Scientists at McMaster University in Canada decided to conduct experiments on older people to show that the masks are completely safe in terms of oxygen content. This is because the elderly are more likely to have medical problems that may face a high risk of death after becoming infected with COVID-19, and wearing masks is what benefits them the most.
It is reported that 25 participants were recruited by researchers from a retirement apartment in Ontario between July 27 and August 10. The researchers provided all the volunteers with the commonly used disposable three-layer non-medical masks and the same type of portable pulse oximeter to measure pulse and oxygen saturation.
The scientists asked the volunteers to measure their oxygen levels before, during and after wearing masks. Participants were told to take measurements every 20 minutes 1 hour before wearing the mask, 1 hour while wearing the mask, and 1 hour after wearing the mask, during these processes, they rested or engaged in activities of daily living.
It is understood that the mean age of the participants is 76.5 years, among whom are 12 women and 13 men. Nine of the volunteers had at least one illness. In this study, the researchers selected volunteers with comorbid heart or respiratory conditions that can cause breathing difficulties or hypoxia, as well as people who are unable to remove their masks without assistance.
In the end, the scientists concluded that the integral mean oxygen saturation before wearing the mask was 96.1%, 96.5% while wearing the mask, and 96.3% after wearing the mask. When wearing a mask, the oxygen content is not less than 92%. The researchers wanted to know if wearing a mask could reduce the blood oxygen saturation of the selected group by 2%, but this did not happen. They noted that although a 3% decrease is considered an important clinical indicator, they chose 2% as an indicator because the elderly have a lower baseline. They concluded that the mask will not hinder oxygenation or cause hypoxia.
