Table 1.
Mean absolute values of oxygen uptake, carbon dioxide output, ventilation, and respiratory exchange ratio during the 60/60 s and the 30/30 s LV-HIIT protocols.
| 60/60 s | 30/30 s | p | ES | ||
|---|---|---|---|---|---|
| VO2 (L/min) | Interval | 3.25 ± 0.57 | 2.83 ± 0.50 | < 0.001 | 3.08 |
| Recovery | 1.85 ± 0.27 | 2.38 ± 0.46 | < 0.001 | 1.95 | |
| Protocol | 2.55 ± 0.40 | 2.61 ± 0.47 | 0.239 | 0.44 | |
| VCO2 (L/min) | Interval | 3.15 ± 0.61 | 2.93 ± 0.58 | 0.011 | 1.09 |
| Recovery | 2.15 ± 0.35 | 2.44 ± 0.45 | 0.022 | 0.93 | |
| Protocol | 2.65 ± 0.45 | 2.69 ± 0.51 | 0.624 | 0.18 | |
| VE (L/min) | Interval | 108.59 ± 27.39 | 94.28 ± 24.98 | < 0.001 | 1.88 |
| Recovery | 74.78 ± 15.96 | 80.50 ± 18.07 | 0.100 | 0.62 | |
| Protocol | 91.69 ± 21.16 | 87.39 ± 21.42 | 0.102 | 0.46 | |
| RER (a.u.) | Interval | 0.98 ± 0.05 | 1.03 ± 0.03 | 0.005 | 1.28 |
| Recovery | 1.20 ± 0.05 | 1.03 ± 0.05 | < 0.001 | 2.49 | |
| Protocol | 1.09 ± 0.05 | 1.03 ± 0.03 | 0.003 | 1.53 | |
Values are presented as mean ± SD. LV-HIIT, low-volume high-intensity interval training; VO2, oxygen uptake; VCO2, carbon dioxide output; VE, ventilation; RER, respiratory exchange ratio; ES, effect size (Cohen’s dz); ES < 0.2 reflects a trivial effect, ≥ 0.2 and < 0.6 reflects a small effect, ≥ 0.6 and < 1.2 reflects a moderate effect, ≥ 1.2 and < 2.0 reflects a large effect, ≥ 2.0 and < 4.0 reflects a very large effect, and ≥ 4.0 reflects a nearly perfect effect.