People run on treadmills at a New York Sports Club in Brooklyn, New York (Photo by Spencer Platt/Getty Images) Previous studies have identified indoor group exercise as a situation where COVID-19 outbreaks can occur, but new research shows this can be exacerbated by the level of fitness intensity.In a study, published last month in the Proceedings of the National Academy of Sciences (PNAS), researchers in Germany designed a method for measuring aerosol particle emission (exhaled breath) at rest and during different exercise intensities among eight men and eight women. "By measuring aerosol particle concentration and ventilation in one individual, we were able to calculate aerosol particle emission that is a more direct measure of the risk of pathogen transmission by aerosol particles by one individual than the aerosol particle concentration in exhaled air or in room air," the study authors wrote.RELATED:New study reveals best time of day to work out for fat loss, muscle strengthResearchers found that people undertaking strenuous exercise produced on average 132 times more aerosol particles than when they are at rest, with no significant difference between women and men.In addition, fitter, endurance-trained subjects exhaled 85% more particles during maximal exercise than untrained subjects which was considered a significant difference, according to the team. "This finding can be used to design improved mitigation strategies for indoor group exercise," the study’s authors added, noting that the data has important implications for infection control during indoor group exercise.
"Together, these data might partly explain superspreader events, especially during high-intensity group exercise indoors and suggest that strong
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