Fig 11.

(a) Tidal volume (V_T), an estimate for the dead volume (V_D) and Breathing frequency BF from the data. (b) Changes in ventilatory parameters during exercise for the 15 CF patients using the proposed form of ${\dot{\text{V}}}_{\text{D}}$ = ${\dot{\text{V}}}_{\text{DB}}$ + a × W(t). In the case of ${\dot{\text{V}}}_{\text{E}}$ the solid dots represent values extracted from the data, for ${\dot{\text{V}}}_{\text{D}}$ and ${\dot{\text{V}}}_{\text{A}}$ these represent values taken from model simulations (see S1 File). In all cases the red stars represent the group mean.