Effect of Short-term Maximal Voluntary Co-contraction Training on Neuromuscular Function
Effect of Short-term Maximal Voluntary Co-contraction Training on Neuromuscular Function
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DOI：
10.1055/s-0033-1349137
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发表时间：
2014-02-01
影响因子：
2.5
通讯作者：
Kanehisa, H.
中科院分区：
文献类型：
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作者：
Maeo, S.;Yoshitake, Y.;Kanehisa, H.
本研究旨在最大限度地利用自愿共收缩来检验短期训练的效果。23名健康青年男性(训练组13人，对照组10人)参加了本次研究。治疗组进行为期4周(3天/周)的训练，训练内容包括肘关节90度屈伸肌同时最大幅度收缩4s，然后进行4s肌肉放松(10次/套，5套/天)。测量干预前后肘屈伸肌群的最大自主等长、等速扭矩及肌层厚度。记录两组肌肉在等长最大自主收缩(MVC)时的肌电(EMG)。干预后，CG在所有测量变量中均未显示出任何显著变化。在TG组，MVC时激动型肌电活动显著增加，肘屈伸肌的最大等长力矩和等速力矩显著增加，而肌肉厚度和非自主共激活水平无明显变化。结果表明，最大自主共收缩训练模式能有效地提高运动肌肉的力量生成能力，而不会增加MVC过程中的非自愿共激活水平。
The present study aimed to examine the effect of short-term training utilizing voluntary co-contraction with maximal efforts. 23 healthy young men (training group: TG, n=13; control group: CG, n=10) participated in this study. TG conducted a 4-week training program (3 days/week), which consisted of 4s simultaneous maximal voluntary contractions of elbow flexors and extensors at 90 degrees of the elbow joint, followed by 4s muscle relaxation (10 repetitions/set, 5 sets/day). Before and after the intervention, maximal voluntary isometric and isokinetic torques and the muscle thicknesses of the elbow flexors and extensors were determined. The electromyograms (EMGs) of the 2 muscle groups during isometric maximal voluntary contraction (MVC) were also recorded. After the intervention, CG did not show any significant changes in all measured variables. In TG, significant increases were found in the agonist EMG activities during MVC, and maximal isometric and isokinetic torques of the elbow flexors and extensors, without significant changes in the muscle thicknesses and involuntary coactivation levels during MVC. The current results indicate that the training mode with maximal voluntary co-contraction is effective for improving the force-generating capabilities of the exercising muscles, without any increases in the level of involuntary coactivation during MVC.