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Investigation of knee flexor and extensor muscle strength in athletes with and without trunk muscle strength asymmetry Cover

Investigation of knee flexor and extensor muscle strength in athletes with and without trunk muscle strength asymmetry

Open Access
|Jan 2021

Figures & Tables

Comparison of trunk muscle strength of symmetric and asymmetric groups

Symmetric GroupAsymmetric Groupz¥, t*p*, ¥
Med ± IQRMed ± IQR
Mean ± SDMean ± SD
Trunk Muscle Strength60°/secPT191.6 ± 60.25157.99 ± 53.742.633*0.010*
FlexionPT/BW3.02 ± 0.632.49 ± 0.653.378*<0.001*
60°/secPT203.35(150.5–260.2)227.2 (194.6–315)–2.550¥0.011¥
ExtensionPT/BW3.39(2.78–3.95)3.93 (3.44–4.71)–3.315¥0.001¥
60°/sec F/E PT Ratio85.45 (81.35–100)56.6 (48.05–75.35)–6.048¥<0.001¥
60°/secPT150.9 ±39.93152.58 ± 41.27–0.185*0.854*
Left RotationPT/BW2.41 (2.17–2.69)2.44 (2.11–2.84)–0.308¥0.758¥
60°/secPT152.2 (113.95–174.55)159.45 (114.5–191.35)–0.929¥0.353¥
Right RotationPT/BW2.38 ± 0.492.53 ±0.53–1.311*0.194*
60°/sec Left/Right Rotation101.6 ±1096.51 ± 9.24–0.875*0.384*
PT Ratio

Comparison of knee muscle strength of symmetric and asymmetric groups at the 60°/sec and 180°/sec angular velocities

Symmetric GroupAsymmetric Groupz¥, t*p*, ¥
Med ± IQRMed ± IQR
Mean ± SDMean ± SD
Knee Muscle Strength60°/sec FlexionDM PT89.45(71.05–116.35)88.85(77.45–114.6)–0.279¥0.780¥
NDM PT94.25 ± 31.3898.33 ± 25.14–0.641*0.523*
DM PT/BW1.52 ± 0.301.51 ± 0.240.123*0.902*
NDM PT/BW1.49 ± 0.301.56 ± 0.23–1.15*0.254*
60°/sec Flexion LSI102.73 ± 10.4597.54 ± 10.832.180*0.032*
60°/sec ExtensionDM PT167.8(145.7–210.5)191.75(149.05–235.1)–0.741¥0.459¥
NDM PT180.87 ± 54.86187.74 ± 45.12–0.612*0.543*
DM PT/BW2.94(2.67–3.27)2.98(2.79–3.37)–0.982¥0.326¥
NDM PT/BW2.86 ± 0.512.98 ± 0.45–1.14*0.258*
60°/sec Extension LSI102.65(97.45–110.05)103.8(94.7–106.8)–0.433¥0.665¥
60°/sec DM F/E51.85(46.9–56.95)49.2(46.95–53.8)–1.054¥0.292¥
60°/sec NDM F/E51.15(48.5–55.8)52.25(48.45–54.85)–0.217¥0.829¥
180°/sec FlexionDM PT71.9(59.6–94.45)75.65(61.4–94.5)–0.269¥0.788¥
NDM PT68.95(58.7–90.4)74.3(60.5–97.25)–0.645¥0.519¥
DM PT/BW1.15(1.06–1.38)1.24(1.08–1.33)–0.260¥0.795¥
NDM PT/BW1.22(1.01–1.40)1.23(1.08–1.37)–0.505¥0.613¥
180°/sec Flexion LSI101.79 ± 13.8598.88 ± 8.831.118*0.267*
180°/sec ExtensionDM PT123.35(104.2–160.1)131.4(105.3–161.95)–0.265¥0.791¥
NDM PT127.1(101.75–166.85)136.35(105–168.5)–0.563¥0.573¥
DM PT/BW2.14 ± 0.392.14 ± 0.360.083*0.934*
NDM PT/BW2.10 ± 0.412.17 ± 0.35–0.883*0.380*
180°/sec Extension LSI100.45(95.75–108.15)98.5(92.3–106.45)–1.102¥0.271¥
180°/sec DM F/E58.79 ± 8.0258.02 ± 70.459*0.647*
180°/sec NDM F/E59.78 ± 9.5757.70 ± 6.101.159*0.250*

Comparison of demographic characteristics of the groups

Symmetric GroupAsymmetric GroupZ¥P¥
Med ± IQR (25–75)Med ± IQR (25–75)
N = 40N = 40
Age (year)17 (16–18)17 (16–18)–0.1520.879
Height (m)1.69 (1.63–1.75)1.68 (1.64–1.77)–0.1640.870
Body Weight (kg)60.85 (53.5–69)61.9 (54.3–68.55)–0.0190.985
BMI (kg/m2)21.46 (19.95–23.1)21.3 (19.89–23.21)–0.0340.973
Professional Experience (year)6 (5–7.5)6.5 (5–8)–0.5610.575
Language: English
Page range: 1 - 8
Submitted on: Oct 19, 2020
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Accepted on: Dec 30, 2020
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Published on: Jan 3, 2021
In partnership with: Paradigm Publishing Services

© 2021 Aydın Balcı, Ezgi Ünüvar, Bihter Akınoğlu, Tuğba Kocahan, Adnan Hasanoğlu, published by University of Physical Education in Warsaw
This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License.