Laboratory of Evaluation of Human Biological Performance, Department of Physical Education and Sports Science, Aristotle University of Thessaloniki, New Buildings of Laboratories, University Campus of Thermi, 57001 Thessaloniki, Greece.
Medicina (Kaunas). 2023 Sep 29;59(10):1749. doi: 10.3390/medicina59101749.
: Asymmetries between the lower limbs were evaluated by both researchers and practitioners as they seem to be related to the occurrence of injuries and the effect on performance. The purposes of this study were to (a) detect asymmetries of the lower limbs using a unilateral jump (single-leg countermovement jump (SLCMJ)) and 505 agility test, and (b) examine asymmetry effects on fitness (acceleration, speed, squat jump, Illinois agility test), in U16 youth male soccer players. : Twenty U16 soccer players performed an SLCMJ and a 505 test to calculate the asymmetry index. They also performed the above fitness tests. The difference between the lower limbs was tested using the paired samples -test (dominant vs. non-dominant). The correlations between the asymmetries of the lower extremities with the performance indicators were tested using the Pearson's correlation test. The level of significance was set at < 0.05. : The lower limbs differed significantly in the SLCMJ and 505 tests ( < 0.05). The only correlation was between the asymmetry in SLCMJ and performance in SJ (r = -0.641, = 0.002). Asymmetries did not affect performance on most fitness tests. : The two asymmetry tests identified asymmetries in different limbs. This indicates the variability in asymmetries and the need for specialized tests depending on the kinematic chain. The asymmetries observed should be eliminated using individualized training programs so that athletes are protected from injuries and from the possible negative impact on performance. Also, the detection of asymmetries in developmental age offers a greater time period for their elimination before the athlete enters professional sports.
: 研究人员和从业者都评估了下肢的不对称性，因为它们似乎与受伤的发生和对表现的影响有关。本研究的目的是(a) 使用单侧跳跃（单腿反向跳跃（SLCMJ））和 505 敏捷测试检测下肢的不对称性，以及(b) 检查不对称性对 U16 青年男性足球运动员的体能（加速度、速度、深蹲跳、伊利诺伊州敏捷测试）的影响。 : 20 名 U16 足球运动员进行了 SLCMJ 和 505 测试，以计算不对称指数。他们还进行了上述体能测试。使用配对样本 t 检验（优势腿与非优势腿）测试下肢之间的差异。使用 Pearson 相关检验测试下肢不对称与表现指标之间的相关性。显著性水平设置为 < 0.05。 : SLCMJ 和 505 测试中下肢差异显著（ < 0.05）。唯一的相关性是 SLCMJ 不对称与 SJ 表现之间的相关性（r = -0.641， = 0.002）。不对称性对大多数体能测试的表现没有影响。 : 两种不对称测试在不同的肢体上都确定了不对称性。这表明了不对称性的可变性，以及根据运动链需要专门测试的必要性。应使用个性化训练计划消除观察到的不对称性，以使运动员免受伤害，并避免对表现产生可能的负面影响。此外，在发育年龄检测到不对称性为运动员进入职业体育之前提供了更长的时间来消除它们。
