Table 2.

Statistical analysis of HIIT vs. control intervention (e.g., low intensity continuous endurance training, low intensity interval training, high-intensity endurance training, small sided games, sport specific technique training, or ordinary sport specific training) comparing the response of peak oxygen uptake (VO_2peak).

			95% Confidence interval
Study name	Unit of VO2peak	Hedge's g	Lower limit	Upper limit
Sandbakk et al., 2011	L·min−1	−0.63	−0.83	−0.43
Impellizzeri et al., 2006	L·min−1	−0.32	−0.36	−0.27
Breil et al., 2010	L·min−1	−0.17	−0.34	−0.01
Impellizzeri et al., 2006	ml·kg−1·min−1	−0.12	−4.72	4.48
Meckel et al., 2014	ml·kg−1·min−1	−0.06	−6.70	6.57
Sandbakk et al., 2011	ml·kg−1·min−1	0.00	−17.07	17.06
Harrison et al., 2015a	ml·kg−0, 75·min−1	0.02	−40.94	40.98
Sperlich et al., 2010	ml·kg−1·min−1	0.04	−9.23	9.31
Breil et al., 2010	ml·kg−1·min−1	0.06	−12.07	12.20
Hill-Haas et al., 2009	ml·kg−0, 75·min−1	0.09	−33.84	34.02
Hill-Haas et al., 2009	ml·kg−1·min−1	0.18	−5.76	6.12
Sperlich et al., 2011	ml·kg−1·min−1	0.19	−5.85	6.22
Impellizzeri et al., 2008	ml·kg−1·min−1	0.21	−3.48	3.90
Helgerud et al., 2001	ml·kg−0, 75·min−1	0.24	−31.80	32.28
Harrison et al., 2015a	ml·kg−1·min−1	0.32	−1.86	2.51
Helgerud et al., 2001	ml·kg−1·min−1	0.39	−4.90	5.68
Safania et al., 2011	ml·kg−1·min−1	0.41	−0.20	1.02
Fernandez-Fernandez et al., 2017	ml·kg−1·min−1	0.48	−1.77	2.73
Helgerud et al., 2001	L·min−1	0.48	0.05	0.91
Mean Hedge's g		0.10

L·min⁻¹–absolute VO_2peak; ml·kg^{−0, 75}·min⁻¹–allometric VO_2peak; ml·kg⁻¹·min⁻¹–relative VO_2peak.