Table 4.

Quality of fit with and without circulatory model

Hyperventilation
Participant	${\mathbf{\epsilon }}_{\mathit{C}{\mathit{O}}_2}$ /${(\mathit{L}\mathit{m}\mathit{i}{\mathit{n}}^{-1})}^2$	${\mathbf{\epsilon }}_{\text{C}{\text{O}}_2}^{\mathit{CBGS}}$ /${(\mathit{L}\mathit{m}\mathit{i}{\mathit{n}}^{-1})}^2$
#2	0.0068	0.0019
#3	0.0129	0.0007
#4	0.0081	0.0004

Rebreathing
Participant	${\mathbf{\epsilon }}_{\mathit{C}{\mathit{O}}_2}$ /${(\mathit{L}\mathit{m}\mathit{i}{\mathit{n}}^{-1})}^2$	${\mathbf{\epsilon }}_{\mathcal{C}{\mathit{\text{O}}}_2}^{\mathit{CBGS}}$ /${(\mathit{L}\mathit{m}\mathit{i}{\mathit{n}}^{-1})}^2$
#2	0.0059	0.0004
#3	0.0232	0.0004
#4	0.0126	0.0005

Oxygen washout
Participant	${\mathbf{\epsilon }}_{{\mathit{O}}_2}$ /${(\mathit{L}\mathit{m}\mathit{i}{\mathit{n}}^{-1})}^2$	${\mathbf{\epsilon }}_{{\mathit{O}}_2}^{\mathit{CBGS}}$ /${(\mathit{L}\mathit{m}\mathit{i}{\mathit{n}}^{-1})}^2$
#1	0.0083	0.0053
#2	0.0031	0.0020
#3	0.0018	0.0008

${\mathbf{\epsilon }}_x$, mean squared error between the measured and simulated rate of exchange of gas x at the mouth without the model for the circulatory and body gas stores; ${\mathbf{\epsilon }}_{\mathit{x}}^{\mathit{CBGS}}$, mean squared error between the measured and simulated rate of exchange of gas x at the mouth with the model for the circulatory and body gas stores.