Table 2.
O2 Kinetics using an algebraic method and a mono-exponential model with different sampling intervals (n = 19)
| Kinetic parameters | Mean ± SD (s) | Goodness of fit (R2) Mean ± SD | Useful measurements (%)a |
|---|---|---|---|
| O2 Onset kinetics | |||
| MRT | 71 ± 19 | – | – |
| τ-5 s | 67 ± 20 | 0.69 ± 0.15 | 26 |
| τ-10 s | 74 ± 22 | 0.81 ± 0.12 | 42 |
| τ-5b | 75 ± 30 | 0.87 ± 0.08 | 79 |
| τ-8b | 74 ± 22 | 0.91 ± 0.07 | 84 |
| O2 Recovery kinetics | |||
| τ-5 s | 60 ± 13 | 0.89 ± 0.06 | 84 |
| τ-10 s | 66 ± 14 | 0.94 ± 0.04 | 100 |
| τ-5b | 61 ± 13 | 0.96 ± 0.03 | 100 |
| τ-8b | 64 ± 13 | 0.98 ± 0.02 | 100 |
Average duration of 5 breath sampling interval 15.9 ± 3.6 s at baseline, 13.0 ± 3.0 s at steady-state. Average duration of 8 breath sampling interval 25.0 ± 5.2 s at baseline, 20.9 ± 4.7 s at steady state
MRT Mean response time, τ time constant calculated with a mono-exponential model, 5s 5 s, 10 s 10 s, 5b 5 breaths, 8b 8 breaths
a The assessment of τ was considered useful when R2 ≥ 0.85