Table 2.
Effect size and changes (percentage) to CRF variables after 8 weeks of HIIT, POL, and THR training intervention.
Variable
Group
Week 1-4
Δ change (%)
Week 5-8
Δ change (%)
All
Δ change (%)
Week 1-4
g (95% CI)
Week 5-8
g (95% CI)
All
g (95% CI)
HR
max
CG
-1.8 + 1.5
0.5 + 2.6
-1.4 + 2.8
1.13 (0.29 to 1.94)
0.14 (-0.49 to 0.76)
0.46 (-0.21 to 1.11)
HIIT
-2.7 + 2.3
0.2 + 3
-2.5 + 4.3
1.07 (0.24 to 1.85)
0.06 (-0.57 to 0.68)
0.53 (-0.16 to 1.18)
POL
-3.1 + 1.9
0.2 + 2.9
-2.9 + 2.9
1.43 (0.49 to 2.34)
0.04 (-0.58 to 0.66)
0.87 (0.10 to 1.61)
THR
-2.5 + 2.3
-0.7 + 1.9
-3.2 + 1.7
0.98 (0.18 to 1.75)
-0.32 (-0.95 to 0.33)
1.67 (0.63 to 2.66)
VO
2
at VT
1
CG
-7.1 + 8
3.8 + 11.7
-3.9 + 10.5
-0.82 (-1.54 to -0.06)
0.25 (-0.39 to 0.88)
-0.44 (-1.08 to 0.23)
HIIT
4.7 + 11.6
8.7 + 9.3
13.9 + 16.5
0.35 (-0.31 to 0.98)
0.84 (0.08 to 1.57)
0.76 (0.02 to 1.47)
POL
1.1 + 10.2
1.8 + 12.7
2.7 + 15.0
0.05 (-0.57 to 0.67)
0.10 (-0.53 to 0.72)
0.12 (-0.51 to 0.74)
THR
8.2 + 6.3
-1.3 + 9.6
6.6 + 9.8
1.22 (0.34 to 2.05)
-0.21 (-0.83 to 0.43)
0.62 (-0.08 to 1.30)
VO
2
at VT
2
CG
0.8 + 14.2
-4.2 + 10.7
-3.3 + 18.7
-0.06 (-0.69 to.56)
-0.39 (-1.02 to 0.27)
-0.29 (-0.92 to 0.35)
HIIT
7.2 + 12.7
4.7 + 4.3
12.0 + 10.5
0.53 (-0.16 to 1.18)
1.00 (0.19 to 1.77)
1.03 (0.21 to 1.80)
POL
6.5 + 6.3
7.1 + 6.7
14.0 + 6.5
1.02 (0.21 to 1.79)
1.10 (0.26 to 1.90)
2.02 (0.85 to 3.16)
THR
1.2 + 10.2
4.9 + 13.2
5.2 + 8.4
0.04 (-0.59 to.66)
0.32 (-0.33 to 0.96)
0.58 (-0.12 to 1.24)
VO
2max
CG
-2.1 + 4.7
1.6 + 6.3
-0.6 + 7.0
-0.44 (-1.09 to 0.23)
0.22 (-0.41 to 0.85)
-0.10 (-0.72 to 0.53)
HIIT
3.4 + 4.5
6.2 + 6.1
9.8 + 7.3
0.65 (-0.06 to 1.34)
0.87 (0.10 to 1.61)
1.26 (0.37 to 2.11)
POL
7.6 + 4.5
4.9 + 3.2
12.9 + 4.6
1.56 (0.57 to 2.52)
1.41 (0.47 to 2.31)
2.67 (1.23 to 4.08)
THR
2.6 + 3.8
4.7 + 5.2
7.3 + 4.6
0.54 (-0.15 to 1.20)
0.80 (0.05 to 1.51)
1.49 (0.52 to 2.43)
VE
max
CG
2.2 + 19.9
-0.3 + 6.8
1.1 + 15.2
0.01 (-0.61 to 0.63)
-0.09 (-0.71 to 0.54)
-0.03 (-0.66 to 0.59)
HIIT
15.7 + 14.1
-0.3 + 4.5
15.2 + 13.1
1.04 (0.22 to 1.81)
-0.13 (-0.75 to 0.50)
1.04 (0.22 to 1.82)
POL
15.6 + 17.8
3.9 + 5.7
19.6 + 15.7
0.79 (0.04 to 1.50)
0.60 (-0.10 to 1.27)
1.18 (0.32 to 2.01)
THR
3.5 + 3.1
-2.1 + 4.2
1.2 + 4.6
1.01 (0.20 to 1.79)
-0.49 (-1.14 to 0.19)
0.26 (-0.38 to 0.89)
TTE
CG
0.7 + 4.9
-0.7 + 3.6
0.0 + 5.0
0.12 (-0.51 to 0.74)
-0.20 (-0.82 to 0.44)
-0.03 (-0.65 to 0.60)
HIIT
6.6 + 4.8
5.2 + 5.8
11.9 + 5.9
1.17 (0.31 to 1.99)
0.83 (0.07 to 1.55)
2.05 (0.87 to 3.19)
POL
8.3 + 4.0
3.4 + 1.8
12.0 + 4.8
2.20 (0.96 to 3.41)
1.76 (0.69 to 2.79)
2.75 (1.28 to 4.20)
THR
5.5 + 5.3
3.4 + 2.6
9.1 + 5.4
0.96 (0.16 to 1.71)
1.19 (0.32 to 2.01)
1.60 (0.59 to 2.56)