Table 1.

Training parameters of participants of the 5-wk high-intensity interval training regimen under normoxia (NORM) and normobaric hypoxia (HYP).

		NORM	HYP	Time effect		Group effect		Time×group effect
				p partial η2		p partial η2		p partial η2
Workload (kp)				<0.001	0.964	0.270	0.055	0.220	0.250
	wk1	1.2±0.1	1.1±0.1
	wk2	2.1±0.3a	2.0±0.3a
	wk3	2.8±0.4a	2.6±0.6a
	wk4	3.3±0.5a	2.9±0.6a
	wk5	3.5±0.6a	3.5±0.3a
Duration (min)				<0.001	0.676	0.521	0.019	0.208	0.256
	wk1	19.5±0.9	18.1±2.6
	wk2	19.0±1.1	19.3±1.0
	wk3	18.3±1.7	18.5±1.6
	wk4	15.8±3.1a	16.1±2.8
	wk5	16.6±2.1a	15.9±1.8
MPO (W·kg−1)				<0.001	0.964	0.049	0.165	0.216	0.251
	wk1	2.1±0.5	1.9±0.3
	wk2	2.8±0.5a	2.5±0.3a
	wk3	3.4±0.6a	3.0±0.4a
	wk4	3.6±0.8a	3.2±0.3a
	wk5	3.9±0.6a	3.3±0.3†a
% HRmax				0.039	0.396	0.471	0.024	0.702	0.104
	wk1	86.2±4.0	88.4±5.2
	wk2	86.5±4.6	87.5±5.1
	wk3	86.4±3.4	86.8±5.4
	wk4	86.3±2.9	86.8±4.8
	wk5	84.3±3.0a	85.7±4.3
TRIMP (au)				<0.001	0.706	0.738	0.005	0.757	0.090
	wk1	43.5±9.8	43.1±9.5
	wk2	45.4±9.9	48.5±10.1
	wk3	42.9±7.1	44.9±10.2
	wk4	36.5±8.2	37.7±10.1
	wk5	33.8±8.1a	32.0±8.3a

Values are expressed as means ± standard deviation. MPO, mean power output relative to body weight; %HR_max, percentage of maximal HR; TRIMP (au), training impulse (arbitrary unit).

^†Significantly different from the corresponding values of the NORM group (p < 0.05).

^aSignificantly different from the corresponding wk1 value in NORM and HYP group (p < 0.05).