Table 1 Time parameters defining the phases of the breathing cycles: total duration T _tot , $\frac{T_{\mathrm{I}}}{T_{\text{tot}}}$ ratio calculated from equation ( 16 ), and the associated inspiratory and expiratory times

T_tot (s)

6.0

5.455

5.0

4.615

4.286

4.0

3.75

$\frac{T_{\mathrm{I}}}{T_{\text{tot}}}$

0.250

0.263

0.275

0.288

0.300

0.313

0.325

T_I (s)

1.5

1.432

1.375

1.327

1.286

1.25

1.219

T_E (s)

4.5

4.023

3.625

3.288

3.0

2.75

2.531

f _v (cpm)

17

18

19

20

21

22

23

T_tot (s)

3.529

3.333

3.158

3.0

2.857

2.727

2.609

$\frac{T_{\mathrm{I}}}{T_{\text{tot}}}$

0.338

0.350

0.363

0.375

0.388

0.400

0.413

T_I (s)

1.191

1.167

1.145

1.125

1.107

1.091

1.076

T_E (s)

2.338

2.166

2.013

1.875

1.75

1.636

1.533

f _v (cpm)

24

25

26

27

28

29

30

T_tot (s)

2.5

2.4

2.308

2.222

2.143

2.069

2.0

$\frac{T_{\mathrm{I}}}{T_{\text{tot}}}$

0.425

0.438

0.450

0.463

0.475

0.488

0.500

T_I (s)

1.063

1.05

1.039

1.028

1.018

1.009

1.0

T_E (s)

1.437

1.35

1.269

1.194

1.125

1.060

1.0