Table 3.

Estimated model parameters for quadratic-delay model

	Model parameters	Healthy	Pulmonary dis.
Dalhousie legs vs %Wmax	a	1 (1.0, 1.05)	1 (1, 1.05)
	b1	0.02 (0.02, 0.02)	0.05 (0.03, 0.08)
	b2	0 (0, 0)	0 (0, 0)
	d	40.7 (27.7, 81.1)	26.7 (5.7, 41.5)
Borg leg fatigue vs %Wmax	a	0.18 (0.02, 0.36)	0.19 (0, 0.25)
	b1	0.02 (0.02, 0.03)	0.04 (0, 0.06)
	b2	0 (0, 0)	0 (0, 0)
	d	63.9 (41.6, 105)	24 (0, 60.4)
Dalhousie breathing effort vs %max ${\stackrel{.}{V}}_E$	a	1 (1, 1.15)	1 (1, 1.01)
	b1	0.06 (0.04, 0.11)	0.15 (0.08, 0.22)
	b2	0 (0, 0)	0 (0, 0)
	d	17.7 (14.9, 24.5)	23.7 (15.9, 29.8)
Borg dyspnea vs %max ${\stackrel{.}{V}}_E$	a	0.03 (0, 0.21)	0.02 (0, 1.68)
	b1	0.07 (0.04, 0.11)	0.11 (0, 0.22)
	b2	0 (0, 0)	0 (0, 0.01)
	d	20.2 (16.4, 30.0)	24.7 (15.9, 41.9)

Shown as median (1st, 3rd quartiles) for ratings perceived exertion and dyspnea, using Borg CR-10 scale or using Dalhousie scales. Model : S = a + b ₁(I − d)⁺ + b ₂((I − d)⁺)²