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Table 4 Cardiorespiratory fitness and exercise performance variables before and after the intervention

From: Low-volume high-intensity interval training improves cardiometabolic health, work ability and well-being in severely obese individuals: a randomized-controlled trial sub-study

Variable HIIT group (n = 30) Control group (n = 18) ANOVA P-value
Baseline Post Baseline Post Time Group Group × Time
VO2max (L/min) 2.7 ± 0.8 3.0 ± 0.7***++ 2.5 ± 0.8 2.3 ± 0.8** 0.146 0.080  < 0.001
VO2max (mL/kg/min) 22.5 ± 6.5 26.0 ± 6.6*** 23.1 ± 8.0 22.5 ± 8.7  < 0.001 0.486  < 0.001
Wmax (W) 168 ± 51 192 ± 48*** 171 ± 64 164 ± 63*  < 0.001 0.444  < 0.001
Wmax (W/kg) 1.4 ± 0.5 1.7 ± 0.5*** 1.6 ± 0.6 1.6 ± 0.7  < 0.001 0.842  < 0.001
HRmax (b/min) 162 ± 15 164 ± 15 163 ± 23 157 ± 22*** 0.309 0.593 0.003
Power at VT (W) 63 ± 28 96 ± 30***+ 75 ± 32 74 ± 32  < 0.001 0.580  < 0.001
  1. HIIT High-intensity interval training group, CON control group, VO2max maximal oxygen uptake, Wmax maximal power output in watts, HRmax maximal heart rate, VT ventilatory threshold
  2. * P < 0.05, ** P < 0.01, *** P < 0.001 significant within-group difference between baseline and post-intervention
  3. +P < 0.05, ++ P < 0.01 significant difference between groups