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首页> 美国卫生研究院文献>Frontiers in Physiology >Lower Arm Muscle Activation during Indirect-Localized Vibration: The Influence of Skill Levels When Applying Different Acceleration Loads
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Lower Arm Muscle Activation during Indirect-Localized Vibration: The Influence of Skill Levels When Applying Different Acceleration Loads

机译：间接局部振动过程中的下臂肌肉激活：施加不同的加速载荷时技能水平的影响

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We investigated the electromyographic response to synchronous indirect-localized vibration interventions in international and national table tennis players. Twenty-six male table tennis players, in a standing position, underwent firstly an upper arms maximal voluntary contraction and thereafter two different 30-s vibration interventions in random order: high acceleration load (peak acceleration = 12.8 g, frequency = 40 Hz; peak-to-peak displacement = 4.0 mm), and low acceleration load (peak acceleration = 7.2 g, frequency = 30 Hz, peak-to-peak displacement = 4.0 mm). Surface electromyography root mean square from brachioradialis, extensor digitorum, flexor carpi radialis, and flexor digitorum superficialis recorded during the two vibration interventions was normalized to the maximal voluntary contraction recording. Normalized surface electromyography root mean square was higher in international table tennis players with respect to national ones in all the interactions between muscles and vibration conditions (P < 0.05), with the exception of flexor carpi radialis (at low acceleration load, P > 0.05). The difference in normalized surface electromyography root mean square between international table tennis players and national ones increased in all the muscles with high acceleration load (P < 0.05), with the exception of flexor digitorum superficialis (P > 0.05). The muscle activation during indirect-localized vibration seems to be both skill level and muscle dependent. These results can optimize the training intervention in table tennis players when applying indirect-localized vibration to lower arm muscles. Future investigations should discriminate between middle- and long-term adaptations in response to specific vibration loads.
机译：我们调查了国际和国家乒乓球运动员对同步间接局部振动干预的肌电反应。 26位站立的男性乒乓球运动员首先进行上臂最大程度的主动收缩，其后以随机顺序进行两次不同的30 s振动干预：高加速度负荷（峰值加速度= 12.8 g，频率= 40 Hz；峰值） -峰位移= 4.0 mm）和低加速度负载（峰加速度= 7.2 g，频率= 30 Hz，峰-峰位移= 4.0 mm）。两次振动干预期间记录的腕radi，伸指，or腕和浅指的表面肌电图均方根被标准化为最大自愿收缩记录。在国际肌肉和振动条件之间的所有相互作用中，国际乒乓球运动员的标准化表面肌电图均方根值均高于国家乒乓球运动员（P <0.05），radial屈腕除外（在低加速负荷下，P> 0.05） 。在国际上，国际乒乓球运动员和本国运动员的标准表面肌电图均方根之间的差异在所有具有较高加速负荷的肌肉中均增加（P <0.05），但指浅指屈肌除外（P> 0.05）。间接局部振动过程中的肌肉激活似乎既取决于技能水平，又取决于肌肉。这些结果可以在对下臂肌肉施加间接局部振动时优化对乒乓球运动员的训练干预。未来的研究应根据特定的振动载荷区分中长期适应和长期适应。

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