Usage of face masks leads to:

– Increased rebreathing of expelled carbon dioxide

– Significant increase in respiration, increased respiratory rate, and hyperventilation

– Increased heart rate

– Increase in Co2 in the blood

– Hypoxemia, which is an abnormal decrease in the partial pressure of oxygen in the arterial blood

– A hypercapnia, which is an increase in the pressure of Co2 in the blood

– General cognitive decline

– Greater difficulty in psychomotor tasks