The effects of cloth face masks on cardiorespiratory responses and VO<sub>2</sub> during maximal incremental running protocol among apparently healthy men.

Sci Rep · 2022 · PMC9789509 · PMID 36566337

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slightly significantno p-value reported

Further, the cloth face mask had a slightly significant negative effect on exercise tolerance.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.