Table 2.

Peak values of oxygen uptake, heart rate and power before (pre) and after (post) intervention in the two training groups (HIIT10 and HIIT60).

	HIIT10		HΙΤ60			Pre vs. Post
	Pre	Post	Pre	Post	Pre vs. Post Main Effect	Change (90 CI%); Hedges g	Group	Interaction
VO2peak (mL/kg/min)	29.4 ± 2.4	36.0 ± 2.1	32.5 ± 5.0	38.1 ± 5.5	p < 0.001, η2 = 0.495	6.1 (5.3, 6.8), ES = 1.42	p = 0.534, η2 = 0.028	p = 0.233, η2 = 0.104
HRpeak (beats/min))	175 ± 10	177 ± 7	177 ± 9	173 ± 8	p = 0.718, η2 = 0.010	−1 (−5, 3), ES = 0.11	p = 0.817, η2 = 0.004	p = 0.248, η2 = 0.094
Wpeak (W)	193 ± 16	231 ± 9	214 ± 32	250 ± 40	p < 0.001, η2 = 0.905	37 (32, 42), ES = 1.28	p = 0.152, η2 = 0.141	p = 0.141, η2 = 0.007

Values are means ± standard deviation. Bold font highlights statistically significant differences. 90% CI, 90% confidence interval; η², partial eta squared; ES, effect size; HR_peak, peak heart rate; VO_2peak, peak oxygen uptake; W_peak, peak power.