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首页> 外文期刊>Journal of athletic training >Shoulder external rotation fatigue and scapular muscle activation and kinematics in overhead athletes.
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Shoulder external rotation fatigue and scapular muscle activation and kinematics in overhead athletes.

机译：肩部外旋疲劳和肩胛骨激活和高架运动员的运动学。

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Context:Glenohumeral external rotation (GH ER) muscle fatigue might contribute to shoulder injuries in overhead athletes. Few researchers have examined the effect of such fatigue on scapular kinematics and muscle activation during a functional movement pattern. Objective:To examine the effects of GH ER muscle fatigue on upper trapezius, lower trapezius, serratus anterior, and infraspinatus muscle activation and to examine scapular kinematics during a diagonal movement task in overhead athletes. SETTING: Human performance research laboratory. DESIGN: Descriptive laboratory study. Patients or Other Participants: Our study included 25 overhead athletes (15 men, 10 women; age = 20 +/- 2 years, height = 180 +/- 11 cm, mass = 80 +/- 11 kg) without a history of shoulder pain on the dominant side. Intervention(s): We tested the healthy, dominant shoulder through a diagonal movement task before and after a fatiguing exercise involving low-resistance, high-repetition, prone GH ER from 0 degrees to 75 degrees with the shoulder in 90 degrees of abduction. Main Outcome Measure(s): Surface electromyography was used to measure muscle activity for the upper trapezius, lower trapezius, serratus anterior, and infraspinatus. An electromyographic motion analysis system was used to assess 3-dimensional scapular kinematics. Repeated-measures analyses of variance (phase x condition) were used to test for differences. RESULTS: We found a decrease in ascending-phase and descending-phase lower trapezius activity (F(1,25) = 5.098, P = .03) and an increase in descending-phase infraspinatus activity (F(1,25) = 5.534, P = .03) after the fatigue protocol. We also found an increase in scapular upward rotation (F(1,24) = 3.7, P = .04) postfatigue. CONCLUSIONS: The GH ER muscle fatigue protocol used in this study caused decreased lower trapezius and increased infraspinatus activation concurrent with increased scapular upward rotation range of motion during the functional task. This highlights the interdependence of scapular and glenohumeral force couples. Fatigue-induced alterations in the lower trapezius might predispose the infraspinatus to injury through chronically increased activation.
机译：背景：Glenohumeral外部旋转（GHER）肌肉疲劳可能有助于开销运动员的肩负伤害。少数研究人员检测了这种疲劳对功能运动模式肩胛上运动学和肌肉激活的影响。目的：探讨GHER肌肉疲劳对上梯肌疲劳，下梯，Serratus肌肉激活的影响，在架空运动员角度下的对角运动任务中检查肩胛上运动学。环境：人类绩效研究实验室。设计：描述性实验室研究。患者或其他参与者：我们的研究包括25个开销运动员（15名男子，10名女性;年龄= 20 +/- 2年，高度= 180 +/- 11厘米，质量= 80 +/- 11克），没有肩膀的历史痛苦的主导方。干预：我们通过倾向于低阻力，高重复，从0度到75度，在90度的绑定中，通过对角运动任务进行了测试的健康的运动任务。主要结果措施：表面肌电学术用于测量上梯形，下梯，Serratus anterior和Infraspinatus的肌肉活动。肌电运动分析系统用于评估三维肩胛上的运动学。反复措施方差分析（阶段X条件）用于测试差异。结果：我们发现上升相和下降阶段下梯度的减少（F（1,25）= 5.098，p = .03）和下降相腹下活性的增加（F（1,25）= 5.534 ，p = .03）疲劳方案后。我们还发现肩胛向上旋转的增加（F（1,24）= 3.7，p = .04）后续行。结论：本研究中使用的GHER肌肉疲劳协议引起了较低的梯度下降和增加的IntaSpinatus激活并发，并随着功能任务期间增加肩胛上向上旋转运动范围增加。这突出了肩胛骨和胶质素力耦合的相互依存。疲劳诱导的较低梯度的改变可能通过长期增加的激活来倾向于血液损伤。

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