Typically, 70 adult males were allocated randomly into two equal groups. There was no significant variation in age, weight, height, or body mass index (BMI) between the two groups (P < 0.05) (Table 1) ...

I will never forget the first time I went out for a run with a mask on. I made it less than a mile before I was out of breath and I had to turn around to walk home. It was clear that my lung capacity ...