Department of Sports Biomechanics, Central Tehran Branch, Islamic Azad University, Tehran, Iran.
Department of Sport Biomechanics, Hamedan Branch, Islamic Azad University, Hamedan, Iran.
Gait Posture. 2024 Sep;113:462-467. doi: 10.1016/j.gaitpost.2024.07.299. Epub 2024 Jul 29.
Anterior cruciate ligament (ACL) injuries may correlate with lower limb angles and biomechanical factors in both dominant and non-dominant legs at initial contact (IC) post-landing. This study aims to investigate the correlation between ankle angles in three axes at IC and knee and hip joint angles during post-spike landings in professional volleyball players, both pre- and post-fatigue induction.
To what extent does fatigue influence lower limb joint angles, and what is the relationship between ankle joint angles and hip and knee angles at IC during the landing phase following a volleyball spike?
Under conditions involving the peripheral fatiguing protocol, the lower limb joint angles at IC following post-spike landings were measured in 28 professional male volleyball players aged between 19 and 28 years, who executed the Bosco fatigue protocol both before and after inducing fatigue. A paired t-test was utilized to compare the joint angles pre- and post-fatigue in both dominant and non-dominant legs. Furthermore, Pearson's correlation test was conducted to explore the relationship between ankle angles at IC and the corresponding knee and hip joint angles.
The findings of the study revealed that fatigue significantly increased hip external rotation and decreased knee joint flexion and external rotation in both the dominant and non-dominant legs (p < 0.05). Additionally, correlation analysis demonstrated that the ankle joint's positioning in the frontal and horizontal planes was significantly associated with hip flexion and external rotation at the IC, as well as with knee flexion and rotation (0.40 < r < 0.80).
Fatigue increased hip external rotation and ankle internal rotation, weakening the correlation between these joints while strengthening the ankle-knee relationship, indicating a reduced hip control in jumps. This suggests a heightened ACL injury risk in the dominant leg due to the weakened ankle-hip connection, contrasting with the non-dominant leg.
在初始接触（IC）后，无论是主导腿还是非主导腿，前交叉韧带（ACL）损伤可能与下肢角度和生物力学因素有关。本研究旨在探讨在专业排球运动员中，踝关节在三个轴上的角度与膝关节和髋关节在扣球后着陆时的角度之间的相关性，包括在疲劳诱导前后。
疲劳在多大程度上影响下肢关节角度，以及在扣球后着陆阶段，踝关节角度与 IC 时的髋关节和膝关节角度之间的关系是什么？
在周围疲劳方案的条件下，在 28 名年龄在 19 至 28 岁之间的专业男性排球运动员中，在执行 Bosco 疲劳方案前后，测量了扣球后着陆时的下肢关节在 IC 时的角度。采用配对 t 检验比较了疲劳前后主导腿和非主导腿的关节角度。此外，进行了 Pearson 相关检验，以探讨 IC 时踝关节角度与相应的膝关节和髋关节角度之间的关系。
研究结果表明，疲劳显著增加了主导腿和非主导腿的髋关节外旋，同时减少了膝关节的屈曲和外旋（p < 0.05）。此外，相关分析表明，踝关节在额状面和水平面的定位与 IC 时的髋关节屈曲和外旋以及膝关节的屈曲和旋转显著相关（0.40 < r < 0.80）。
疲劳增加了髋关节外旋和踝关节内旋，削弱了这些关节之间的相关性，同时加强了踝关节-膝关节的关系，表明跳跃时髋关节的控制能力下降。这表明主导腿的 ACL 受伤风险增加，因为踝关节-髋关节的连接减弱，与非主导腿相反。
