Table 4.

Cardiorespiratory fitness and exercise performance variables before and after the intervention

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

HIIT High-intensity interval training group, CON control group, VO_2max maximal oxygen uptake, W_max maximal power output in watts, HR_max maximal heart rate, VT ventilatory threshold

* P < 0.05, ** P < 0.01, *** P < 0.001 significant within-group difference between baseline and post-intervention

⁺P < 0.05, ⁺⁺ P < 0.01 significant difference between groups