Table 2.
Cardiorespiratory fitness measures.
| Measure | ET | P-SIT | A-SIT | CON |
|---|---|---|---|---|
| Study compliance (%) | 90.9 ± 7.3 | 91.2 ± 4.4 | 91.4 ± 7.6 | — |
| Time GXT (s) | ||||
| Pre | 373 ± 98 | 380 ± 90 | 393 ± 87 | 389 ± 98 |
| Post | 446 ± 109∧ | 470 ± 98∧ | 455 ± 89∧ | 400 ± 96 |
| Raw Δ | 73 ± 54∗ | 90 ± 41∗ | 62 ± 57 | 10 ± 49 |
| % Δ | 21 ± 17 | 25 ± 14 | 18 ± 17 | 3 ± 15 |
| Peak output GXT (W) | ||||
| Pre | 180 ± 41 | 183 ± 38 | 189 ± 36 | 187 ± 41 |
| Post | 211 ± 46∧ | 222 ± 38∧ | 215 ± 36∧ | 191 ± 40 |
| Raw Δ | 30 ± 23∗ | 39 ± 18∗ | 26 ± 24∗ | 4 ± 20 |
| % Δ | 18 ± 14 | 23 ± 13 | 15 ± 14 | 3 ± 12 |
| VO2 GXT (L·min−1) | ||||
| Pre | 2.26 ± 0.46 | 2.33 ± 0.54 | 2.61 ± 0.47 | 2.33 ± 0.49 |
| Post | 2.60 ± 0.50 | 2.82 ± 0.55∧ | 2.91 ± 0.53 | 2.41 ± 0.40 |
| Raw Δ | 0.34 ± 0.28 | 0.49 ± 0.22∗ | 0.30 ± 0.29 | 0.07 ± 0.26 |
| % Δ | 16 ± 15 | 22 ± 12 | 12 ± 12 | 5 ± 13 |
| VO2 GXT (mL·kg−1·min−1) | ||||
| Pre | 23.6 ± 4.2 | 24.8 ± 4.8 | 28.2 ± 4.0 | 26.4 ± 6.0 |
| Post | 27.4 ± 5.2 | 29.9 ± 5.1∧ | 31.3 ± 3.8 | 27.1 ± 4.9 |
| Raw Δ | 3.8 ± 3.3 | 5.1 ± 2.4∗ | 3.1 ± 3.2 | 0.7 ± 3.3 |
| % Δ | 17 ± 16 | 22 ± 11 | 12 ± 12 | 4 ± 14 |
Data mean ± standard deviation. ET: endurance training condition (n = 15); P-SIT: passive sprint-interval training condition (n = 15); A-SIT: active sprint-interval training condition (n = 15); CON: nonexercising control condition (n = 14). ∗Significant within-group change from baseline (P < 0.05). ∧Significant between-group change (P < 0.05). GXT: graded exercise test at 85% of age-predicted heart rate maximum (HRmax); VO2: volume of oxygen uptake.