Rabello Rodrigo, Brunetti Claudia, Bertozzi Filippo, Rodrigues Rodrigo, Sforza Chiarella
Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, Italy.
Department of Mechanical Engineering, Politecnico di Milano, Milan, Italy; E4Sport Lab, Politecnico di Milano, Milan, Italy.
J Electromyogr Kinesiol. 2023 Oct 14;73:102833. doi: 10.1016/j.jelekin.2023.102833.
Knee abduction and hip adduction during functional tasks may indicate increased joint injury risk and discriminate between pathological and healthy people. Muscles' neuromuscular variables such as amplitude (EMG) and onset (EMG) have been used to explain kinematics. The study aimed to evaluate the correlation between two EMG variables of seven trunk and lower limb muscles and 3D kinematics during two tasks. Eighteen physically-active women participated in the study. The following variables were obtained during single-leg squat and anterior step-down: (i) EMG and EMG of fibularis longus (FL), tibialis anterior (TA), vastus medialis (VM), biceps femoris (BF), gluteus medius (GMED), ipsilateral (OB_IL) and contralateral (OB_CL) external obliques and (ii) knee abduction and hip adduction angular displacement (initial angle - angle at 60° of knee flexion). Spearman's correlation coefficient was calculated between kinematic and EMG variables. Greater knee abduction was correlated with delayed TA, GMED and OB_IL during step-down. Greater hip adduction was correlated with lower VM, BF and delayed VM during step-down. Although task-specific, these results suggest that EMG may influence knee abduction, while both EMG and EMG may affect hip adduction. The identification of muscle activation patterns in relation to kinematics may help the development of injury prevention and rehabilitation programs.
在功能性任务中，膝关节外展和髋关节内收可能表明关节损伤风险增加，并可区分病理状态和健康状态的人群。肌肉的神经肌肉变量，如幅度（肌电图）和起始时间（肌电图），已被用于解释运动学。本研究旨在评估七块躯干和下肢肌肉的两个肌电图变量与两项任务期间三维运动学之间的相关性。18名身体活跃的女性参与了该研究。在单腿深蹲和向前下台阶过程中获得了以下变量：（i）腓骨长肌（FL）、胫骨前肌（TA）、股内侧肌（VM）、股二头肌（BF）、臀中肌（GMED）、同侧（OB_IL）和对侧（OB_CL）腹外斜肌的肌电图和肌电图；（ii）膝关节外展和髋关节内收角位移（初始角度 - 膝关节屈曲60°时的角度）。计算运动学变量和肌电图变量之间的斯皮尔曼相关系数。在下台阶过程中，更大的膝关节外展与TA、GMED和OB_IL的延迟有关。更大的髋关节内收与下台阶过程中较低的VM、BF以及VM的延迟有关。尽管具有任务特异性，但这些结果表明肌电图可能影响膝关节外展，而肌电图和肌电图都可能影响髋关节内收。识别与运动学相关的肌肉激活模式可能有助于制定损伤预防和康复计划。
