Madruga-Parera Marc, Dos'Santos Thomas, Bishop Chris, Turner Anthony, Blanco David, Beltran-Garrido Vicente, Moreno-Pérez Victor, Romero-Rodríguez Daniel
University School of Health and Sport (EUSES), University of Girona, Girona, Spain.
FC Barcelona Second Team, Sport Performance Area, Barcelona, Spain.
J Hum Kinet. 2021 Jul 28;79:41-53. doi: 10.2478/hukin-2021-0081. eCollection 2021 Jul.
In this study, we aimed to analyze the magnitude and direction of inter-limb asymmetries in ankle dorsiflexion range of motion (ROM), power (using iso-inertial devices), and a neuromuscular skill (change of direction). Secondarily, we aimed to determine the relationship between inter-limb asymmetry scores for each test and also between these scores and the scores for the different performance tests. Sixteen semiprofessional male soccer players (age: 25.38 ± 6.08 years; body height: 1.78 ± 0.64 m; body mass: 79.5 ± 14.9 kg) participated in this study. We calculated inter-limb asymmetries using five tests: ankle dorsiflexion ROM, change of direction (COD 180º), and iso-inertial resistance tasks in the open (leg extension strength (LE), leg curl strength (LC)) and closed (crossover step (CRO)) kinetic chain. Our results showed that asymmetry magnitudes differed between all tests with highest inter-limb asymmetries displayed during iso-inertial overloading. In addition, we observed that the direction of asymmetries varied depending on the test-specificity, and that the CRO asymmetries had a negative association with LE and CRO performance. These findings highlight the independent nature of asymmetries and that CRO could be an appropriate test to detect asymmetries related with the performance of soccer-specific actions (such as changes of direction). Practitioners are encouraged to use multiple tests to detect existing inter-limb differences according to the specific characteristics of each sport.
在本研究中，我们旨在分析踝关节背屈活动范围（ROM）、力量（使用等惯性装置）和神经肌肉技能（变向）方面的肢体间不对称的程度和方向。其次，我们旨在确定每项测试的肢体间不对称分数之间的关系，以及这些分数与不同性能测试分数之间的关系。16名半职业男性足球运动员（年龄：25.38±6.08岁；身高：1.78±0.64米；体重：79.5±14.9千克）参与了本研究。我们使用五项测试计算肢体间不对称性：踝关节背屈ROM、变向（180°COD）以及开放动力链（腿部伸展力量（LE）、腿部卷曲力量（LC））和闭合动力链（交叉步（CRO））中的等惯性阻力任务。我们的结果表明，所有测试之间的不对称程度不同，等惯性过载期间表现出最高的肢体间不对称。此外，我们观察到不对称的方向因测试特异性而异，并且CRO不对称与LE和CRO表现呈负相关。这些发现突出了不对称的独立性，并且CRO可能是检测与足球特定动作（如变向）表现相关的不对称的合适测试。鼓励从业者根据每项运动的具体特点使用多种测试来检测现有的肢体间差异。
