Kinematic, kinetic and EMG patterns during downward squatting
Kinematic, kinetic and EMG patterns during downward squatting
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DOI：
10.1016/j.jelekin.2006.07.010
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发表时间：
2008-02-01
影响因子：
2.5
通讯作者：
Hirata, Rogerio Pessoto
中科院分区：
文献类型：
--
作者：
Dionisio, Valdeci Carlos;Almeida, Gi Luicio;Hirata, Rogerio Pessoto
本研究的目的是调查运动学，动力学和肌电图模式前，期间和后下蹲时，躯干运动限制在矢状面。八名健康受试者在两种不同的位置下蹲，半蹲（40度膝关节屈曲）和半蹲（70度膝关节屈曲）。记录股内侧斜肌、股内侧长肌、股直肌、股外侧肌、股二头肌、半腱肌、腓肠肌外侧肌和胫骨前肌的肌电图反应。使用光电系统重建主要关节的运动学。压力中心（COP）是通过从一个测力板上收集的数据获得的，踝关节和膝关节扭矩是通过逆动力学计算的。在直立位置有小的变化，在COP和膝关节和踝关节扭矩。胫骨前肌引起了这种直立姿势的中断，开始了下蹲。在下蹲的加速阶段，COP向后移动，膝关节扭矩保持屈曲，没有可测量的肌肉激活。随着身体进入减速阶段，膝关节扭矩增加，朝向伸展，在四头肌的四个头中观察到主要的肌肉活动。了解这些运动学，动力学和肌电图策略之前，期间和之后的蹲下，预计将有利于从业者利用蹲下作为一项任务，以改善运动功能。(C)2006爱思唯尔有限公司保留所有权利。
The aim of this study was to investigate the kinematic, kinetic, and electromyographic pattern before, during and after downward squatting when the trunk movement is restricted in the sagittal plane. Eight healthy subjects performed downward squatting at two different positions, semisquatting (40 degrees knee flexion) and half squatting (70 degrees knee flexion). Electromyographic responses of the vastus medialis oblique, vastus medialis longus, rectus femoris, vastus lateralis, biceps femoris, semitendineous, gastrocnemius lateralis, and tibialis anterior were recorded. The kinematics of the major joints were reconstructed using an optoelectronic system. The center of pressure (COP) was obtained using data collected from one force plate, and the ankle and knee joint torques were calculated using inverse dynamics. In the upright position there were small changes in the COP and in the knee and ankle joint torques. The tibialis anterior provoked the disruption of this upright position initiating the squat. During the acceleration phase of the squat the COP moved posteriorly, the knee joint torque remained in flexion and there was no measurable muscle activation. As the body went into the deceleration phase, the knee joint torque increased towards extension with major muscle activities being observed in the four heads of the quadriceps. Understanding these kinematic, kinetic and EMG strategies before, during and after the squat is expected to be beneficial to practitioners for utilizing squatting as a task for improving motor function. (C) 2006 Elsevier Ltd. All rights reserved.