Padulo Johnny, Di Giminiani Riccardo, Dello Iacono Antonio, Zagatto Alessandro M, Migliaccio Gian M, Grgantov Zoran, Ardigò Luca P
University eCampusNovedrate, Italy; Faculty of Kinesiology, University of SplitSplit, Croatia.
Department of Biotechnological and Applied Clinical Sciences, University of L'Aquila L'Aquila, Italy.
Front Physiol. 2016 Jun 16;7:242. doi: 10.3389/fphys.2016.00242. eCollection 2016.
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.
我们研究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图反应。26名男性乒乓球运动员站立位，首先进行上臂最大自主收缩，然后以随机顺序进行两种不同的30秒振动干预：高加速度负荷（峰值加速度 = 12.8 g，频率 = 40 Hz；峰峰值位移 = 4.0 mm）和低加速度负荷（峰值加速度 = 7.2 g，频率 = 30 Hz，峰峰值位移 = 4.0 mm）。在两次振动干预期间记录的肱桡肌、指伸肌、桡侧腕屈肌和指浅屈肌的表面肌电图均方根被标准化为最大自主收缩记录。在所有肌肉与振动条件的相互作用中，国际乒乓球运动员的标准化表面肌电图均方根高于国家乒乓球运动员（P < 0.05），桡侧腕屈肌除外（在低加速度负荷下，P > 0.05）。在高加速度负荷下，国际乒乓球运动员和国家乒乓球运动员之间标准化表面肌电图均方根的差异在所有肌肉中均增加（P < 0.05），指浅屈肌除外（P > 0.05）。间接局部振动期间的肌肉激活似乎既取决于技能水平也取决于肌肉。这些结果可以在对前臂肌肉应用间接局部振动时优化乒乓球运动员的训练干预。未来的研究应该区分对特定振动负荷的中长期适应性。
