Relationship between ventilation () and the inspiratory work to overcome resistance at the mouth (WR_I) (Upper panel) and the associated inspiratory power (PR_I) (lower panel) with increasing resistive load (R_K).

<p>For sake of clarity exercise mode has been omitted on the lower panel (see text) The applied loads were 0 (grey fill), 0.75 (black fill) and 1.5 (no fill) kPa.L.sec⁻¹. In the upper panel, exercise modes; <b>○</b>, resting and seated; □, walking at 4 kmh⁻¹; ◊, cycling at 50 watts; Δ, cycling at 100 watts; ★stars, cycling at 150 watts. Fitted linear regression are shown for each applied load, R² = 0.85, 0.93, 0.93, and P² = 0.83,0.93, 0.92 at 0, 0.75, 1.5 kPa.L.sec⁻¹respectively. In the lower panel no distinction is made between exercise mode and fitted quadratic lines are shown for each applied load, at 0, Y = 0.98+−0.2^×+0.03^×2, R² = 0.97 P² = 0.996, at 0.75 kPa.L.sec⁻¹, Y = 0.05+0.025^×+0.034^×2, R² = 0.97, P² = 0.97, and at load 1.5 kPa.L.sec⁻¹ Y = 0.94+−0.043^×+0.07^×2 R² = 0.98, P² = 0.98. In all cases p<0.001.