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Muscular Activation Patterns in Swimmers with Asymptomatic Shoulder Joint Instability

机译：无症状肩关节不稳游泳者的肌肉激活模式

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Purpose. The aim of this study was to investigate the (electromyographic) EMG patterns of the shoulder muscles in asymptomatic swimmers with AGI - atraumatic glenohumeral instability. AGI, one of the most common shoulder disorders in athletes who perform overhead activities, occurs especially among swimmers. AGI usually provokes shoulder pain and secondary impingement syndrome, which might alter glenohumeral and scapular kinematics and change the activity of the shoulder muscles. Alternatively, pain or functional activities might affect EMG patterns in individuals with AGI. Methods. Eight swimmers with AGI and eight healthy swimmers took part in this cross-sectional study. Bilateral and simultaneous shoulder elevations in the scapular plane toward three different target distances were investigated, and the shoulder kinematics and EMG activities of the glenohumeral and scapulothoracic muscles were also collected. Results. No differences in the EMG patterns were found between swimmers with and without AGI in terms of the rate of EMG rise and magnitude. Conclusions. Shoulder instability does not necessarily affect the modulation of the shoulder muscles in swimmers with AGI. Others factors such as laxity in the capsular structures and ligaments may be one of the primary reasons for pain and instability in these athletes.
机译：目的。这项研究的目的是调查无症状游泳者伴AGI（无创伤性盂肱肱骨不稳定性）肩部肌肉的（肌电图）EMG模式。 AGI是进行举重运动的运动员中最常见的肩部疾病之一，尤其是在游泳者中。 AGI通常会引起肩部疼痛和继发性撞击综合征，这可能会改变肩肱和肩cap骨运动学并改变肩部肌肉的活动。或者，疼痛或功能活动可能会影响AGI患者的EMG模式。方法。八名有AGI的游泳者和八名健康的游泳者参加了这项横断面研究。研究了肩cap骨向三个不同目标距离的双侧和同时肩部抬高，还收集了肩肱和肩and胸肌的肩运动学和肌电图活动。结果。在有肌电图上升率和幅度方面，有和没有AGI的游泳者之间的肌电图谱没有差异。结论。肩部不稳不一定会影响AGI游泳者肩部肌肉的调节。其他因素，例如包膜结构和韧带的松弛，可能是这些运动员疼痛和不稳定的主要原因之一。

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