Post-swim oxygen consumption: assessment methodologies and kinetics analysis

This study aimed at comparing different recovery-based methods to assess the highest exercise oxygen uptake value ([Formula: see text]O₂peak) when swimming at low-moderate, heavy and severe intensities. Complementarily, the different recovery curve kinetics were analysed.

Eighteen competitive swimmers performed a 5 × 200 m front crawl intermittent protocol (0.05 m · s^-1 increments and 3 min intervals), with respiratory gas exchange being continuously measured breath-by-breath during and post-exercise using a portable gas analyser. The directly determined [Formula: see text]O₂peak ([Formula: see text]O_2dir) was compared with the values obtained by linear and exponential backward extrapolations (of different intervals) and the recovery curve mathematical modelling.

[Formula: see text]O_2dir rose with intensity increase: 41.96 ± 6.22, 46.36 ± 6.89 and 50.97 ± 7.28 ml · kg^-1 min^-1 for low-moderate, heavy and severe swims. Linear and exponential regressions applied to the first 20 s of recovery presented the [Formula: see text]O₂peak values closest to [Formula: see text]O_2dir at low-moderate (42.80 ± 5.54 vs 42.88 ± 5.58 ml kg^-1 min^-1), heavy (47.12 ± 4.91 vs 47.48 ± 5.09 ml kg^-1 min^-1) and severe intensity domains (51.24 ± 6.89 vs 53.60 ± 8.54 ml kg^-1 · min^-1, respectively; r = 0.5-0.8, p < 0.05). The mono-exponential function was the best fit at low-moderate and heavy intensities, while the bi-exponential function better characterized the severe exercise domain (with a slow component amplitude, time delay and time constant of 6.2 ± 2.3 ml kg^-1 min^-1, 116.6 ± 24.3 and 39.9 ± 15.2 s, respectively).

The backward extrapolation of the first 20 s of recovery is the best method to assess the [Formula: see text]O₂peak for a large spectrum of swimming intensities. Complementarily, intensity increases imply different recovery curve kinetics, particularly a mono-exponential behaviour for low-moderate and heavy exertions and a bi-exponential dynamics for severe paces.