Use of magnitude estimation for estimating the parameters of dyspnea.

Magnitude estimation, a psychophysic method, allows examination of variables associated with the respiratory sensation of loaded breaths. The subject's perceptual sensitivity can be quantified by magnitude-scaling exponents which describe the rate of growth of the dyspnea sensation associated with increases in the magnitude of the stimulus. Measurement of the perception of dyspnea by magnitude estimation can complement other measurements of variables that contribute to this complex sensation. Use of magnitude estimation techniques can enhance the study of similar clinical problems such as pain and fatigue.