Table 4. Within-group change and mixed-effects results in graded exercise test measurements.
HIFT1 (n = 3) HIFT2 (n = 7) HIFT3 (n = 8) Mixed-Effects
Pre
M (SD)
Post
M (SD)
Cohen’s d
[95% CI]
Pre
M (SD)
Post
M (SD)
Cohen’s d
[95% CI]
Pre
M (SD)
Post
M (SD)
Cohen’s d
[95% CI]
Group
p-value
Time
p-value
G × T
p-value
VO2max (mL/kg/min) 30.6
(2.0)
33.8
(1.7)
0.83
[-2.13, 0.59]
31.2
(8.6)
31.8
(8.7)
0.19
[-0.93, 0.56]
25.8
(4.5)
24.1
(4.0)
0.46
[-0.29, 1.176]
0.055 0.374 0.098
WLmax (MET) 10.0
(1.5)
10.9
(0.8)
0.20
[-1.32, 0.97]
10.1
(3.9)
10.6
(3.1)
0.20
[-0.94, 0.56]
8.4
(1.4)
8.5
(1.6)
0.31
[-0.82, 0.57]
0.263 0.419 0.902
VO2/VT1 (L/min) 1.4
(0.3)
1.7
(0.5)
1.87
[-3.87, 0.18]
1.2
(0.3)
1.3
(0.3)
0.46
[-1.23, 0.43]
1.3
(0.6)
1.3
(0.4)
0.19
[-0.89, 0.51]
0.407 0.010 0.136
WL/VT1 (MET) 3.7
(0.7)
4.5
(0.8)
0.59
[-1.79, 0.71]
3.7
(0.8)
4.2
(1.0)
0.78
[-1.62, 0.10]
3.5
(0.7)
3.9
(0.7)
0.48
[-1.20, 0.27]
0.489 0.014 0.772
VO2/VT2 (L/min) 2.1
(0.4)
2.4
(1.0)
0.78
[-1.88, 0.41]
2.0
(0.6)
2.3
(0.7)
1.36
[-2.39, -0.28]
1.9
(0.9)
2.0
(0.8)
0.08
[-0.77, 0.62]
0.623 0.021 0.193
WL/VT2 (MET) 6.6
(0.7)
8.1
(1.9)
0.62
[-1.83, 0.70]
7.4
(2.3)
8.4
(2.7)
2.47
[-4.01, -0.91]
6.3
(1.1)
7.5
(2.7)
0.79
[-1.62, 0.10]
0.603 0.011 0.960
High-intensity functional training (HIFT). One-day per week (HIFT1). Two-days per week (HIFT2). Three-days per week (HIFT3). Maximal oxygen uptake (VO2max). Workload (WL). First ventilatory threshold (VT1). Second ventilatory threshold (VT2). Group by time interaction (G×T).