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Scapular kinematics during unloaded and maximal loaded isokinetic concentric and eccentric shoulder flexion and extension movements
Journal of Electromyography and Kinesiology ( IF 2.0 ) Pub Date : 2021-01-17 , DOI: 10.1016/j.jelekin.2021.102517
Monique Wochatz , Sophie Rabe , Tilman Engel , Steffen Mueller , Frank Mayer

Characterization of scapular kinematics under demanding load conditions might aid to distinguish between physiological and clinically relevant alterations. Previous investigations focused only on submaximal external load situations. How scapular movement changes with maximal load remains unclear. Therefore, the present study aimed to evaluate 3D scapular kinematics during unloaded and maximal loaded shoulder flexion and extension. Twelve asymptomatic individuals performed shoulder flexion and extension movements under unloaded and maximal concentric and eccentric loaded isokinetic conditions. 3D scapular kinematics assessed with a motion capture system was analyzed for 20° intervals of humeral positions from 20° to 120° flexion. Repeated measures ANOVAs were used to evaluate kinematic differences between load conditions for scapular position angles, scapulohumeral rhythm and scapular motion extent. Increased scapular upward rotation was seen during shoulder flexion and extension as well as decreased posterior tilt and external rotation during eccentric and concentric arm descents of maximal loaded compared to unloaded conditions. Load effects were further seen for the scapulohumeral rhythm with greater scapular involvement at lower humeral positions and increased scapular motion extent under maximal loaded shoulder movements. With maximal load applied to the arm physiological scapular movement pattern are induced that may imply both impingement sparing and causing mechanisms.



中文翻译:

在无负荷和最大负荷等速同心和偏心肩部屈伸运动中的肩k运动

在苛刻的负荷条件下,肩cap运动的特征可能有助于区分生理变化和临床相关变化。先前的研究仅关注于最大外部负载情况。肩cap骨运动如何随最大负荷变化尚不清楚。因此,本研究旨在评估3D肩cap骨运动在无负荷和最大负荷的肩部屈伸过程中的运动。12名无症状个体在无负荷和最大同心和偏心负荷等速运动条件下进行了肩部屈伸运动。使用运动捕捉系统评估的3D肩cap骨运动学分析了20°到120°屈曲的肱骨位置的20°间隔。重复测量方差分析用于评估肩conditions骨位置角度,肩cap骨节律和肩cap骨运动程度的载荷条件之间的运动学差异。与空载相比,在最大负重的偏心和同心臂下降过程中,肩shoulder屈和伸展时肩骨向上旋转增加,后倾和外旋减少。肩oh节律的负荷效应进一步得到体现,肩lower骨受累程度越低,肱骨位置越低,在最大负重肩部运动下肩骨的运动程度也增加。在施加最大负载的情况下,会引起生理性肩cap骨运动模式,这既可能意味着撞击,也可能导致机制。与空载相比,在最大负重的偏心和同心臂下降过程中,肩shoulder屈和伸展时肩骨向上旋转增加,后倾和外旋减少。肩oh节律的负荷效应进一步得到体现,肩lower骨受累程度越低,肱骨位置越低,在最大负重肩部运动下肩骨的运动程度也增加。在施加最大负载的情况下,会引起生理性肩cap骨运动模式,这既可能意味着撞击,也可能导致机制。与空载相比,在最大负重的偏心和同心臂下降过程中,肩shoulder屈和伸展时肩骨向上旋转增加,后倾和外旋减少。肩oh节律的负荷效应进一步得到体现,肩lower骨受累程度越低,肱骨位置越低,在最大负重肩部运动下肩骨的运动程度也增加。在施加最大负载的情况下,会引起生理性肩cap骨运动模式,这既可能意味着撞击,也可能导致机制。肩oh节律的负荷效应进一步得到体现,肩lower骨受累程度越低,肱骨位置越低,在最大负重肩部运动下肩骨的运动程度也增加。在施加最大负载的情况下,会引起生理性肩cap骨运动模式,这既可能意味着撞击,也可能导致机制。肩oh节律的负荷效应进一步得到体现,肩lower骨受累程度越低,肱骨位置越低,在最大负重肩部运动下肩骨的运动程度也增加。在施加最大负载的情况下,会引起生理性肩cap骨运动模式,这既可能意味着撞击,也可能导致机制。

更新日期:2021-01-24
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