The numbers are impressive, but experts insist that the finding applies to many other places.
Scientists already knew that the small particles in the air that we breathe – the aerial propagation of Covit-19 by aerosols – are significantly higher when we exercise at closed intervals. However, A study According to a study by a team of researchers at the University of Munich, experts believe that a person emits 132 times more aerosols per minute when exercising in their spare time, which could lead to the formation of disease-causing poles.
The numbers are impressive. When we are completely immobile and at rest, we exhale an average of 580 particles per minute. However, during high-intensity exercise, a person can expel 76,200 particles per minute if taken for fatigue.
“This data can be used not only to explain SARS-CoV-2 transmissions during indoor group exercise, but also to design more targeted mitigation measures for indoor physical activity such as physical education classes at school, dance events during weddings or high intensity. Exercise classes such as spinning”, reads In the study.
Henning Walkerhage, co-author of the study and professor of physical biology at the University of Munich University of Technology, was surprised by the results of this study, which brought new depth to the scientific knowledge of the number of particles in a liter of air. Exercise.
“When we exercise, we know that more air is being expelled from the human body. But when we exercise a lot, we do not know that there are more particles in a liter of air, I did not expect. Periodical.
To achieve this result, the scientists exhausted several individuals on stationary bikes, with a silicone mask on their face, which is attached to a plastic container that stores and measures the number of particles. This “closed loop” in the air allowed the researchers to get a clear picture of the number of particles emitted by each of these individuals, eliminating external pollution.
However, the German team of researchers agrees that there are some limitations to the study, starting with the number of participants in the sample: only 16 were tested. In addition, none of them favored Govit-19, but scientists justify this absence with ethical concerns about the potential health risks of participants.
Although emissions of aerosol particles are one of the main risks for the spread of SARS-CoV-2, it is not the only risk because it depends on the concentration of the virus in the particles released by the infection. .
The study also shows that the concentrations of aerosol particles in expired air vary greatly from person to person. People with better body product excrete 85% more particles than other participants. Researchers justify the high need to supply oxygen to the muscles. According to the results of this study, the distribution of particles did not show a significant difference between males and females.
“These are not gymnasiums.” Focus on ventilation
According to experts, low ventilation and overcrowding indicate high risk of developing diseases such as Govt-19. Places where many people sing or dance are referred to as places where they can be spread by health officials. In this sense, it is unreasonable to isolate gyms as the most favorable place for the spread of the virus, as public health physician Bernardo Gomez underlines.
“It’s not just gyms, it’s indoor body spaces that are not ventilated. Ventilation is very important. Indoor air quality should be a priority in the coming years. Areas with low ventilation are more conducive to the need to wear a mask, ”the public health doctor stressed, adding that people can look for larger establishments that allow better air circulation and more space between people.
In addition, not all gyms are the same, and using a mask when practicing certain methods in gyms will not solve the problem. Therefore, the expert advises you to take into account the time you use and pay attention to the ventilation of the indoor areas where you exercise, especially at times when the virus is known to spread with high intensity.
It is recalled that the average number of infections in Portugal increased again. This Wednesday, National Institute of Health doctor Ricardo Jorge (INSA) revealed it The number of daily cases has increased from 22,805 to 29,101 Corona virus transmission index (Rt) is above 1 in Portugal and all regions.
According to the INSA Weekly Report on Evolution Govit-19 In the country, Rt drops from 1.23 to 1.13 nationally, but all regions present an average of more than 1 in 5 days, indicating an “increasing trend” of epidemics.
North reports Rt 1.12, Center 1.06, Lisbon and Vel To Tejo 1.20, Allendejo 1.09, Alcorve 1.12, Azores 1.21 and Madeira 1.18. The value of Rt – which estimates the number of secondary infections resulting from each person carrying the virus – is higher than that from April 26 to 1.
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