the University of Saskatchewan
The Association of American Medical Colleges
the University of Saskatchewan College of Kinesiology
Runner’s World
the International Journal of Environmental Research and Public Health
Phil Chilibeck
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Canada
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Stationary bikes are commonly used in studies because they allow for more control, but additional research on runners in particular for longer efforts will be needed to understand how masks affect a sustained, sub-maximal effort such as a half marathon or marathon.Face coverings can make exercise feel more difficult for some, but that perceived effect could be influenced by a number of factors including psychosomatic elements, humidity, and prolonged intensity, but there is no evidence they affect blood oxygen levels.
As said here by https://www.runnersworld.com/news/a34629912/how-masks-affect-performance-study/