Fig. 2

Line plots of dyspnea ratings obtained with breathing effort sub-scale of the Dalhousie scales and Borg dyspnea rating for each individual subject, plotted vs ventilation; and of perceived leg exertion obtained by Dalhousie and Borg scales vs work. Dashed red vertical lines indicate delay (“d” term in Table 3). One can see a general upward trend during incremental exercise but with marked inter-individual variability irrespective of diagnosis