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(A,B) Physical working capacity at the heart rate of 130 and 150 beats per minute using different face masks. Grey shaded boxplots represent the physical working capacity at the heart rate of 150 beats per minute. Asterisks indicate statistically significant differences (Bonferroni corrected p < 0.003). PWC, physical working capacity; MedMask, medical face mask; FFP2exhal, filtering facepiece with exhalation valve.
