Perception of dyspnea (Borg Score) (mean ±SE) during breathing at six levels of resistance in 12 normal subjects, 11 patients with asthma but no near fatal attacks, and 11 patients with near fatal asthma.
Redrawn from: Kikuchi Y, Okabe S, Tamura G, et al, N Engl J Med 1994; 330:1329.
