Table 4. Bilaterally averaged values for isokinetic peak torque (Nm) and reciprocal strength ratios and ANOVA results for the differences between the three PTA groups in professional soccer players (N=100).
Type of contraction (testing speed)
Professional Training Age (PTA)
ANOVA (linear)
ANOVA (quadratic)
ANOVA (omnibus)
5-7 years (N=34)
8-10 years (N=30)
≥ 11 years (N=36)
F
p
F
p
F
p
Knee
Extension
Con60
231.35
247.85
237.65
.67
.20
3.25
.04
3.16
.04
Con 180
162.9
172.8
168.2
.92
.16
1.95
.08
1.41
.12
Con 300
132.45
137.2
135.9
.66
.20
.60
.22
.75
.23
Ecc60
304.45
319.25
311.65
.29
.29
.86
.17
.57
.28
Ecc 180
283.75
300.7
293.7
.60
.21
1.02
.15
.80
.22
Flexion
Con 60
129.5
140.5
139.1
3.27
.04
1.85
.08
2.53
.04
Con 180
99.35
107.95
106.15
3.21
.04
2.28
.06
2.71
.03
Con 300
89.5
98.4
94.25
1.80
.09
2.20
.07
1.44
.12
Ecc 60
183.3
190.95
201.3
3.77
.02
.18
.33
1.96
.07
Ecc 180
179.35
188.45
194.05
3.16
.03
.06
.40
1.61
.10
Ankle
Dorsal
Con 60
23.05
24.555
22.4
.32
.28
3.13
.04
1.74
.09
flexion
Ecc 60
49.65
50.55
48.45
.30
.29
.80
.18
.56
.28
Plantar
Con 60
109.8
120.7
119.9
3.87
.02
1.17
.14
2.49
.04
Flexion
Ecc 60
209.3
216.15
210
.00
.49
.52
.23
.26
.38
KneeStrength Ratios
Conv. ratio
60 deg/sec
.555
.570
.585
2.04
.07
.00
.48
1.02
.18
180 deg/sec
.605
.625
.630
1.52
.11
.20
.32
.86
.21
300 deg/sec
.675
.705
.695
.77
.19
1.19
.13
.96
.19
Funct. ratio
60 deg/sec
.790
.800
.855
2.77
.05
.62
.21
1.69
.09
180 deg/sec
1.100
1.095
1.155
1.60
.10
.55
.22
1.09
.16
Con = Concentric, Ecc = Eccentric, Conv = Conventional concentric knee ratio (Concentric Knee Flexion/Concentric Knee Extension), Funct = Functional knee ratio (Eccentric Knee Flexion/ Concentric Knee Extension).