Table 3.
Mean ± SD of the physiological and perceptual responses during the IT protocols, and ⩒O2 kinetics (⩒O2K) during the first bout of IT100 and IT200 (N = 12).
| Variable | IT8x100 | IT4x200 | IT100 | IT200 |
|---|---|---|---|---|
| Peak-⩒O2 (ml·kg−1·min−1) | 57.3 ± 4.9 | 57.2 ± 4.6 | 57.5 ± 5.0 | 57.3 ± 4.4 |
| Peak-⩒O2 (%⩒O2peak) | 96.8 ± 5.8 | 96.7 ± 4.4 | 97.1 ± 5.9 | 96.8 ± 3.8 |
| MPeak-⩒O2 (ml·kg−1·min−1) | 54.5 ± 4.2 | 55.2 ± 4.0 | 54.3 ± 4.1 | 55.1 ± 4.1 |
| MPeak-⩒O2 (%⩒O2peak) | 92.1 ± 4.6 | 93.3 ± 4.5 | 91.8 ± 4.6 | 93.3 ± 4.8 |
| [La−]peak (mmol·L−1) | - | - | 7.9 ± 3.4 | 8.7 ± 1.5 |
| RPE (0–10 units) | 7.62 ± 2.0* | 9.5 ± 0.7* | 9.4 ± 0.9 | 9.7 ± 0.9 |
| A (ml·kg−1·min−1) | - | - | 44.9 ± 6.1 | 43.0 ± 4.6 |
| TD (s) | 11.7 ± 4.2 | 11.1 ± 3.0 | ||
| τ(s) | - | - | 24.2 ± 8.9 | 24.6 ± 6.6 |
| O2Def (ml·kg−1·min−1) | - | - | 28.8 ± 14.3 | 27.0 ± 8.5 |
| Velocity (m/s) | - | - | 1.26 ± 0.09 | 1.23 ± 0.09 |
| Velocity (%MAV) | - | - | 99.7 ± 2.6 | 96.8 ± 2.4 |
Peak-⩒O2 and %Peak-⩒O2: maximal ⩒O2 achieved in the test and corresponding percentage of ⩒O2peak; MPeak-⩒O2 and %MPeak-⩒O2: average value and corresponding percentage of the Peak-⩒O2 achieved during the performance of each bout of IT protocols; [La−]peak: peak blood lactate concentration after each IT protocol performance; velocity: the actual velocity while performing each IT protocol.
*
Statistical difference between IT protocols (IT8x100 vs. IT4x200 or IT100 vs. IT200) at p ≤ 0.05.