From: Effects of a taped filter mask on peak power, perceived breathlessness, heart rate, blood lactate and oxygen saturation during a graded exercise test in young healthy adults: a randomized controlled trial
Rating
Corresponding breathlessness intensity
0
No shortness of breath at all
0.5
Very, very light (barely perceptible)
1
Very light
2
Mild
3
Moderate
4
Rather severe
5
Severe
6
7
Very severe
8
9
Very, very severe
10
Maximal respiratory distress