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Trunk Muscle Activation at the Initiation and Braking of Bilateral Shoulder Flexion Movements of Different Amplitudes

机译:不同幅度的双侧肩部屈曲运动开始和制动时躯干肌肉的激活

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摘要

The aim of this study was to investigate if trunk muscle activation patterns during rapid bilateral shoulder flexions are affected by movement amplitude. Eleven healthy males performed shoulder flexion movements starting from a position with arms along sides (0 degrees) to either 45 degrees, 90 degrees or 180 degrees. EMG was measured bilaterally from transversus abdominis (TrA), obliquus internus (OI) with intra-muscular electrodes, and from rectus abdominis (RA), erector spinae (ES) and deltoideus with surface electrodes. 3D kinematics was recorded and inverse dynamics was used to calculate the reactive linear forces and torque about the shoulders and the linear and angular impulses. The sequencing of trunk muscle onsets at the initiation of arm movements was the same across movement amplitudes with ES as the first muscle activated, followed by TrA, RA and OI. All arm movements induced a flexion angular impulse about the shoulders during acceleration that was reversed during deceleration. Increased movement amplitude led to shortened onset latencies of the abdominal muscles and increased level of activation in TrA and ES. The activation magnitude of TrA was similar in acceleration and deceleration where the other muscles were specific to acceleration or deceleration. The findings show that arm movements need to be standardized when used as a method to evaluate trunk muscle activation patterns and that inclusion of the deceleration of the arms in the analysis allow the study of the relationship between trunk muscle activation and direction of perturbing torque during one and the same arm movement.
机译:这项研究的目的是调查快速双侧肩部屈曲过程中躯干肌肉的激活方式是否受运动幅度的影响。 11位健康的男性从手臂沿侧面(0度)的位置开始进行了屈曲运动,直至45度,90度或180度。通过肌内电极从横腹(TrA),内斜肌(OI)以及从有表面电极的腹直肌(RA),竖脊肌(ES)和三角肌双侧测量EMG。记录3D运动学,并使用逆动力学计算绕肩膀的反作用线性力和扭矩以及线性和角度脉冲。手臂运动开始时躯干肌肉发作的顺序在运动幅度上与ES相同,与第一个肌肉被激活,然后是TrA,RA和OI。在加速过程中,所有手臂的运动都会在肩部周围产生屈曲角度冲动,而在减速过程中,该冲动会反向。运动幅度增加导致腹肌发作潜伏期缩短,TrA和ES的激活水平增加。 TrA的激活程度在加速和减速中相似,而其他肌肉特定于加速或减速。研究结果表明,当手臂运动用作评估躯干肌肉激活模式的方法时,需要进行标准化,并且在分析中将手臂的减速度包括在内,可以研究躯干肌肉激活与一次运动中摄动扭矩方向之间的关系。和相同的手臂运动。

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