A CASE STUDY ON ACTIVATION LEVEL OF ROTATOR CUFF MUSCLES USING ELECTROMYOGRAPHY AND ASSOCIATED MUSCLE FORCES

Allyson Mitchell, AmirHossein Majidirad, G. Pujalte
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Abstract

Rotator cuff tears are among the most common shoulder injuries, making them an attractive topic of study. Yet, there is a lack of clear understanding of attributes associated with deep and superficial muscles when it is intended to study the recovery progress after rehabilitation. Through a systematic approach, this project investigates the activation of rotator cuff muscles using surface electromyography (sEMG) sensors. The team developed a strategic plan to investigate the precision of the NORAXON technology that is utilized in this study to ensure that it is capable of capturing small variations in shoulder motion. This is followed by a reliability analysis to ascertain reproducibility of the experiment. The levels of muscle activities for superficial and deep muscles are monitored to explore the impact of traditionally prescribed arm movements used for the rehabilitation of rotator cuff injuries. Furthermore, an analysis of forces generated in the muscles is done to provide better insight into the activation levels of rotator cuff muscles. The results were promising, with a competent technology and acceptable correlation associated with muscle activities across all subjects. Four common arm movements were studied; scaption generated a significant response in the targeted muscles, particularly of the supraspinatus. Results were conclusive across all subjects, and simulation also supported the experiment showing high activation levels for the supraspinatus. The teres minor also showed a significant contribution when performing external rotation at 90⁰ abduction. The outcome of this study is significant for this ongoing project as it identifies the most impactful exercises that ensure targeted muscles are being triggered. It also lays the groundwork for expanding the project to a clinical study focusing on the most effective arm movements in order to improve rehabilitation process and reduce pertinent cost.
应用肌电图和相关肌肉力量研究肩袖肌的激活水平
肩袖撕裂是最常见的肩部损伤之一,使其成为一个有吸引力的研究课题。然而,在研究康复后的恢复进展时,对深肌和浅肌的相关属性缺乏清晰的认识。通过系统的方法,本项目研究了使用表面肌电图(sEMG)传感器的肩袖肌肉的激活。该团队制定了一项战略计划,以调查NORAXON技术的精度,该技术在本研究中使用,以确保它能够捕捉肩部运动的微小变化。随后进行可靠性分析,以确定实验的可重复性。监测浅表和深层肌肉的肌肉活动水平,以探索用于肩袖损伤康复的传统处方手臂运动的影响。此外,对肌肉中产生的力进行分析,以更好地了解肩袖肌肉的激活水平。结果是有希望的,在所有的受试者中,都有一个合格的技术和可接受的与肌肉活动相关的相关性。研究了四种常见的手臂动作;绞杀在目标肌肉中产生了显著的反应,特别是冈上肌。所有受试者的结果都是决定性的,模拟也支持冈上肌高激活水平的实验。在进行90⁰外展时,小圆肌也显示出重要的贡献。这项研究的结果对这个正在进行的项目很重要,因为它确定了最有效的运动,确保目标肌肉被触发。这也为将该项目扩展到临床研究奠定了基础,重点关注最有效的手臂运动,以改善康复过程并降低相关成本。
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