Lin Jian-Zhi, Hung Min-Hao, Ko Bo-Jen, Lee Heng-Ju
Department of Physical Education, National Taiwan University of Sport, Taichung, Taiwan.
Office of Physical Education, National Chin-Yi University of Technology, Taichung, Taiwan.
Sports Biomech. 2024 Aug 30:1-15. doi: 10.1080/14763141.2024.2369910.
This study investigates the impact of chronic ankle instability (CAI) on athletes' lower extremity mechanics during bounce drop-jump landings with divided attention. Thirty Division I physical education voluntarily participated in the study. They performed two sets of bounce drop jumps: one set with a divided attention task and the other without. The obtained data were analysed using a paired t-test to compare the outcomes between the divided attention (DA) and non-divided attention (NDA) tasks. Athletes with CAI, during the DA task, displayed higher vertical landing forces, increased ankle inversion velocity, and greater range of motion of the ankle, knee, and hip in the frontal and transverse planes. They also exhibited insufficient neuromuscular preparation of the rectus femoris muscle. Notably, distinct kinematic alterations were observed in the ankle, knee, and hip joints regarding frontal and transverse lower-extremity kinematics. The findings suggest that athletes with CAI experience decreased activation of the rectus femoris muscle, which may impact their dynamic postural stability from pre-landing to ascending phases. Furthermore, the results indicate that individuals with CAI closely replicate the injury mechanisms encountered during a drop-jump landing task with divided attention. These insights offer valuable information about the real-time challenges faced by athletes with CAI.
本研究调查了慢性踝关节不稳（CAI）对运动员在注意力分散的单腿跳下落着地过程中下肢力学的影响。30名一级体育专业学生自愿参与了该研究。他们进行了两组单腿跳下落：一组伴有注意力分散任务，另一组没有。使用配对t检验对获得的数据进行分析，以比较注意力分散（DA）任务和非注意力分散（NDA）任务之间的结果。患有CAI的运动员在DA任务期间，表现出更高的垂直着地力、增加的踝关节内翻速度，以及在额状面和横断面中踝关节、膝关节和髋关节更大的运动范围。他们还表现出股直肌的神经肌肉准备不足。值得注意的是，在踝关节、膝关节和髋关节的额状面和横断面下肢运动学方面观察到明显的运动学改变。研究结果表明，患有CAI的运动员股直肌的激活减少，这可能会影响他们从着地前到上升阶段的动态姿势稳定性。此外，结果表明，患有CAI的个体在注意力分散的情况下，在下落跳着地任务中会重现受伤机制。这些见解为患有CAI的运动员面临的实时挑战提供了有价值的信息。
