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首页> 外文期刊>Journal of Biomechanics >Reduced elbow extension torque during vibrations
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Reduced elbow extension torque during vibrations

机译：降低振动过程中的肘伸扭矩

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摘要

Impact sports and vibration platforms trigger vibrations within soft tissues and the skeleton. Although the long-term effects of vibrations on the body have been studied extensively, the acute effects of vibrations are little understood. This study determined the influence of acute vibrations at different frequencies and elbow angles on maximal isometric elbow extension torque and muscle activity. Vibrations were generated by a pneumatic vibrator attached to the lever of a dynamometer, and were applied on the forearm of 15 healthy female subjects. The subjects were instructed to push maximally against the lever at three different elbow angles, while extension torque and muscle activity were quantified and compared between vibration and non-vibration (control) conditions. A change in vibration frequency had no significant effects on torque and muscle activity although vibrations in general decreased the maximal extension torque relative to the control by 1.8% (±5.7%, p>0.05), 7.4% (±7.9%, p<0.01), and 5.0% (±8.2%, p<0.01) at elbow angles of 60°, 90°, and 120°, respectively. Electromyographic activity increased significantly between ~30% and 40% in both triceps and biceps with vibrations. It is speculated that a similar increase in muscle activity between agonist and antagonist, in combination with an unequal increase in muscle moment arms about the elbow joint, limit the maximal extension torque during exposure to vibrations. This study showed that maximal extension torque decreased during vibration exposure while muscle activity increased and suggests that vibrations may be counterproductive during activities requiring maximal strength but potentially beneficial for strength training.
机译：冲击运动和振动平台会触发软组织和骨骼内的振动。尽管已广泛研究了振动对人体的长期影响，但对振动的急性影响却知之甚少。这项研究确定了不同频率和肘角度的急性振动对最大等距肘伸展扭矩和肌肉活动的影响。振动是由安装在测力计操纵杆上的气动振动器产生的，并施加在15名健康女性受试者的前臂上。受试者被指示以三个不同的肘部角度最大程度地向杠杆推动，同时对伸展扭矩和肌肉活动进行量化，并在振动和非振动（控制）条件下进行比较。振动频率的变化对扭矩和肌肉活动没有明显影响，尽管相对于对照组，振动通常使最大伸展扭矩降低了1.8％（±5.7％，p> 0.05），7.4％（±7.9％，p <0.01） ）和5.0％（±8.2％，p <0.01），分别在60°，90°和120°的肘角处。肱三头肌和二头肌的振动使肌电图活动显着增加，介于〜30％和40％之间。据推测，激动剂和拮抗剂之间类似的肌肉活动增加，加上肘关节周围的肌肉力矩臂不均匀增加，限制了暴露于振动过程中的最大伸展扭矩。这项研究表明，在暴露于振动中时，最大伸展扭矩会减小，而肌肉活动会增加，并表明在需要最大强度的活动中，振动可能适得其反，但可能有益于力量训练。

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