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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