Comparison of the Effectiveness of High-Intensity Interval Training in Hypoxia and Normoxia in Healthy Male Volunteers: A Pilot Study

Table 2

Maximal oxygen uptake (VO_2max) and physiological results before and after training in both training groups.


Variables	Pretraining		Posttraining			95% confidence interval for differences
Variables	Mean	SD	Mean	SD		Mean differences	Lower bound	Upper bound

Hypoxia group
VO_2max (mL/kg/min)	53.2	2.6	59.4	4.6	0.01	6.2	−8.9	−2.7
LA_max (mmol/L)	11.1	1.8	10.4	1.5	0.06	−0.7	0.1	1.3
VE_max (L/min)	163.2	9.6	166.9	13.8	0.05	3.7	−12.2	−2.2
HR_max (1/min)	189.0	8.0	191.0	4.0	0.07	2.0	0.1	2.8
SBP_max (mm Hg)	160.0	12.0	162.0	13.0	0.11	2.0	−14.1	−4.1
DBP_max (mm Hg)	77.0	8.0	72.0	6.0	0.06	−5.0	−11.2	−2.4
SatO_2max (%)	94.8	3.6	91.5	2.4	0.01	−3.3	0.8	4.4
pO_2max (mmHg)	88.3	1.7	68.2	1.2	0.01	−20.1	17.3	22.7
pCO_2max (mmHg)	34.1	1.7	33.4	1.2	0.05	−0.7	−0.4	1.2
P_max (Watt)	277.3	16.1	293.6	15.7	0.05	16.4	−30.2	−2.5

Normoxia group
VO_2max (mL/kg/min)	54.2	2.6	55.4	4.8	0.47	1.2	−2.9	1.4
LA_max (mmol/L)	11.2	1.8	10.6	1.6	0.33	−0.6	−0.3	0.9
VE_max (L/min)	160.4	12.5	165.4	13.0	0.05	5.0	−7.8	−1.5
HR_max (1/min)	190.0	6.0	191.0	3.0	0.06	1.0	−4.0	0.1
SBP_max (mm Hg)	156.0	10.0	155.0	9.0	1.00	−1.0	−8.9	−4.1
DBP_max (mm Hg)	77.0	8.0	76.0	8.0	0.91	−1.0	−4.8	−3.7
SatO_2max (%)	98.8	3.6	96.8	4.1	0.08	−2.0	1.8	3.1
pO_2max (mmHg)	88.3	1.7	87.8	1.8	0.17	−0.5	−0.2	1.4
pCO_2max (mmHg)	35.1	1.7	34.2	1.3	0.08	−0.9	−0.4	1.2
P_max (Watt)	280.1	15.1	290.0	9.2	0.06	18.9	−31.6	−4.8