Strength Level of Professional Elite Soccer Players after the COVID-19 Lockdown Period: A Retrospective Double-Arm Cohort Study
Table 2
Team A strength values before (pre) and after (post) quarantine period.
Pre
Post
Mean Difference
95% CI
†
d‡
Knee extensors
M
±SD
M
±SD
M
±SD
Concentric peak torque
242.70
43.21
244.04
38.09
2.19
54.93
−19.99
24.37
0.84
NA
Eccentric peak torque
304.41
47.29
302.04
54.82
3.84
59.77
−20.29
27.98
0.74
NA
Knee flexors
Concentric peak torque
142.62
25.30
154.04
27.01
−9.53
34.86
−23.62
4.54
0.17
NA
Eccentric peak torque
179.79
27.06
175.91
31.06
7.50
44.29
−10.38
25.38
0.39
NA
HQ ratios
Conventional
0.59
0.06
0.63
0.05
0.04
0.03
−12.66
9.31
0.91
NA
Functional
0.74
0.03
0.72
0.04
−0.02
0.01
−8.11
6.14
0.72
NA
Mean (M); standard deviation (SD); confidence interval of 95% (CI); not applicable (NA); ∗difference statistically significant ( < 0.05); † alfa level < 0.05; and ‡ cohen d effect size.
