Heil Jessica
Institute of Sport Science, Carl von Ossietzky University Oldenburg, Oldenburg, Germany.
Front Hum Neurosci. 2022 Mar 11;16:824730. doi: 10.3389/fnhum.2022.824730. eCollection 2022.
Inter-limb asymmetries are associated with a higher potential risk for non-contact injuries. Differences in function or performance between the limbs might lead to imbalances and promote instability, increasing the potential risk for injuries. Consequently, an investigation of inter-limb asymmetries should be included in injury risk assessment. Furthermore, since non-contact injuries mainly occur under loaded conditions, an investigation of load-induced changes of inter-limb asymmetries can provide additional information on the athlete's potential injury risk. Therefore, the current study aimed to investigate the influence of physical load on inter-limb asymmetries in dynamic postural control, which is essential in situations with a high risk for non-contact injuries such as landing, cutting, or stopping. In total, dynamic postural control of 128 active and healthy subjects (64 males and 64 females, age: 23.64 ± 2.44, height: 176.54 ± 8.96 cm, weight: 68.85 ± 10.98 kg) was examined. Dynamic postural control was tested with the Y-Balance Test (YBT) before and after a loading protocol on a bicycle ergometer or a treadmill. The results showed no significant increase of the inter-limb asymmetries in anterior direction [ = 4.44, = 0.04, η = 0.03]. Moreover, there is high variation between the subjects regarding the magnitude and the direction of the asymmetries and the changes due to load. Therefore, a more individual analysis considering the magnitude and the direction of the asymmetries is required. Thereby, considering different modifying factors, e.g., sex, injury history, and baseline level of asymmetries, can be helpful. Moreover, an analysis of the changes during load might provide further insights, reveal possible differences, and help detect the reasons and mechanisms underlying inter-limb asymmetries and asymmetrical loading.
肢体间不对称与非接触性损伤的潜在风险较高相关。肢体之间功能或表现的差异可能导致失衡并加剧不稳定，从而增加受伤的潜在风险。因此，在损伤风险评估中应纳入对肢体间不对称的调查。此外，由于非接触性损伤主要发生在负荷状态下，研究负荷引起的肢体间不对称变化可以提供有关运动员潜在损伤风险的额外信息。因此，本研究旨在探讨身体负荷对动态姿势控制中肢体间不对称的影响，动态姿势控制在着陆、变向或停止等高风险非接触性损伤情况下至关重要。总共对128名活跃且健康的受试者（64名男性和64名女性，年龄：23.64±2.44岁，身高：176.54±8.96厘米，体重：68.85±10.98千克）的动态姿势控制进行了检查。在自行车测力计或跑步机上进行负荷方案前后，用Y平衡测试（YBT）对动态姿势控制进行测试。结果显示，前向肢体间不对称没有显著增加[ = 4.44， = 0.04，η = 0.03]。此外，受试者之间在不对称的程度、方向以及负荷引起的变化方面存在很大差异。因此，需要进行更个体化的分析，考虑不对称的程度和方向。从而，考虑不同的修正因素，例如性别、受伤史和不对称的基线水平，可能会有所帮助。此外，对负荷期间变化的分析可能会提供进一步的见解，揭示可能存在的差异，并有助于发现肢体间不对称和不对称负荷背后的原因和机制。
