Fig. 5From: Respiratory consequences of N95-type Mask usage in pregnant healthcare workers—a controlled clinical studyOxygen and Carbon dioxide content of expired air in pregnant women at rest and following exercise. (a) Forced expired O2 (FeO2) and (b) forced expired CO2 concentrations (FeCO2) were measured with a metabolic cart. N = 19 (±SEM)Back to article page