Department of Corrective Exercise and Sports Injury, Faculty of Sport Sciences, Allameh Tabataba'i University, Western Azadi Sport Complex Boulevard, Hakim Highway, Tehran, Iran.
Department of Biomechanics and Sports Injuries, Kharazmi University, Tehran, Iran.
Sci Rep. 2023 Aug 31;13(1):14305. doi: 10.1038/s41598-023-41648-7.
It has been indicated that dual tasks may multiply the possibility of injuries due to divided attention. This study aimed to investigate the effect of dual-task on kinematics and kinetics of jump landing in female athletes with and without dynamic knee valgus. In this study, 32 recreational athletes between 18 and 30 years old were recruited and divided into with (n = 17) and without (n = 15) dynamic knee valgus groups. The 3-D positions of retroreflective markers were recorded at 200 Hz using a 8-camera Kestrel system (Motion Analysis Corporation, Santa Rosa, CA), while ground reaction forces were synchronously recorded at 1000 Hz using 2 adjacent force plates (FP4060-NC; Bertec Corporation, Columbus, OH). Kinematics and kinetics of jump landing were recorded while counting backward digits as a dual task, and also without counting backward digits as a single task. One-way repeated measures of variance were used to analyse data at the significant level of 95% (α < 0.05). The study found that the dual-task affected the angles and moments of hip, knee, and ankle joints (P < 0.05) in both groups. Additionally, the effect of the dual-task differed significantly between the two groups in the angles hip flexion (P < 0.001), knee abduction (P < 0.001), and ankle internal rotation (P = 0.001), as well as the moments hip flexion (P < 0.001), hip abduction (P = 0.011), knee flexion (P = 0.017), knee internal rotation (P < 0.001), ankle dorsiflexion (P = 0.046), ankle eversion (P < 0.001), and ankle internal rotation (P = 0.046). Athletes with dynamic knee valgus may have been less able to protect themselves during the landing and are more prone to lower extremities injuries. As a result, using kinematics and kinetics in athletes with dynamic knee valgus during landing may help identify potential mechanisms associated with risk factors of lower extremity injuries and ACL injuries as well.
已经表明，双重任务可能会因注意力分散而增加受伤的可能性。本研究旨在调查双重任务对有和无动态膝外翻的女性运动员跳跃着陆时运动学和动力学的影响。在这项研究中，招募了 32 名年龄在 18 至 30 岁之间的娱乐运动员，并将他们分为有（n=17）和无（n=15）动态膝外翻组。使用 8 个摄像机的 Kestrel 系统（Motion Analysis Corporation，Santa Rosa，CA）以 200Hz 的速度记录 3-D 位置的后向反射标记，同时使用 2 个相邻的力板（FP4060-NC；Bertec Corporation，Columbus，OH）以 1000Hz 的速度同步记录地面反作用力。在跳跃着陆时，通过向后倒数作为双重任务记录运动学和动力学，同时不向后倒数作为单一任务记录运动学和动力学。使用单向重复测量方差分析在 95%的显著水平（α<0.05）下分析数据。研究发现，双重任务影响了两组的髋关节、膝关节和踝关节的角度和力矩（P<0.05）。此外，双重任务对两组的髋关节屈曲角度（P<0.001）、膝关节外展角度（P<0.001）和踝关节内旋角度（P=0.001）以及髋关节屈曲力矩（P<0.001）、髋关节外展力矩（P=0.011）、膝关节屈曲力矩（P=0.017）、膝关节内旋力矩（P<0.001）、踝关节背屈力矩（P=0.046）、踝关节外翻力矩（P<0.001）和踝关节内旋力矩（P=0.046）的影响有显著差异。有动态膝外翻的运动员在着陆时可能更难保护自己，更容易受伤。因此，在跳跃着陆时使用有动态膝外翻的运动员的运动学和动力学可以帮助识别与下肢受伤和 ACL 受伤相关的潜在机制。
