来源于Thera-Band Academy Blog  May2，2012

Shoulder muscle activation during closed chain instability exercises

肩部肌肉在闭链不稳定性运动中的活化性更高

Closed chain exercises such as weight-bearing through the shoulder in a quadruped position are thought to increase co-contraction around the glenohumeral joint for stabilization. The addition of an unstable surface such as an exercise ball is often prescribed for therapeutic exercises to increase shoulder muscle activation compared to a stable surface.

 

闭链运动比如跪位肩部负重被认为可以提高肩关节周围稳定性肌群的联合收缩。额外的不稳定性平面比如训练球经常被应用于物理治疗，以此来增加相对于稳定平面更高的肌肉活性。

  Researchers in Brazil compared the surface EMG activation of glenohumeral and scapulothoracic muscles in 12 healthy subjects. They performed 3, 6-second contractions in 3-point kneeling with the dominant hand either on a stable surface or on an exercise ball with axial load.

俯卧撑式 与远端一端固定在一个稳定的表面     远端固定在瑞士球上

 

巴西研究员把12个健康受试者的肩关节和肩胛胸壁肌肉的表面肌电活化性。他们在稳定平面或者轴向负重训练球。

The researchers found no significant difference in EMG levels of the glenohumeral muscles between stable and unstable surfaces, but did note a significant increase in EMG activation in the scapulothoracic muscles. In addition, force output was 23% less on the exercise ball compared to the stable surface. The authors commented that a maintenance or increase in EMG levels despite reduced force output suggests high levels of neuromuscular coordination are used on unstable surfaces such as the Thera-Band exercise ball and mini-ball.

 

研究表明在稳定和不稳定平面肩关节肌肉的肌电图水平没有明显的不同，但是却记录到了肩胛胸壁肌肌电活化提高。此外，相比稳定性训练球而言，使用训练球力量输出减少23%。作者得出结论尽管减少的力量输出，更高肌电图水平的维持意味着高水平的神经肌肉被应用于不稳定表面如赛乐练习球和迷你训练球。

 

REFERENCE: de Araújo RC, de Andrade R, Tucci HT, Martins J, de Oliveira AS. Shoulder muscular activity during isometric three-point kneeling exercise on stable and unstable surfaces. J Appl Biomech. 2011 Aug;27(3):192-6.

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