Neuromuscular adaptations following 12-week maximal voluntary co-contraction tr aining
Neuromuscular adaptations following 12-week maximal voluntary co-contraction tr aining
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12 周最大自主收缩训练后的神经肌肉适应
DOI：
10.1007/s00421-013-2801-x
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发表时间：
2014
影响因子：
3
通讯作者：
Hiroa ki Kanehisa.
中科院分区：
文献类型：
--
作者：
Sumiaki Maeo;Yasuhide Yoshitake;Yohei Takai;Tetsuo Fukunaga;Hiroa ki Kanehisa.
PurposeThe本研究探讨神经肌肉适应12周最大自愿cocontraction training.MethodsSixteen年轻男子被分配到训练组（TG，n= 9）或对照组（CG，n= 7）。TG进行训练计划（3d/周），包括肘屈肌和肘伸肌在手肘关节90°处同时收缩4s的最大自主收缩，随后进行4s的肌肉放松（10次/组，5次/天），持续12周。除了肘屈肌和伸肌的肌肉厚度，扭矩和肌电图（EMG）的两个肌肉群在等长最大随意收缩（MVC）前（前），4周后，和12周的intervention.ResultsAfter干预，CG显示在所有测量变量没有显着变化。在TG中，与术前相比，肘屈肌（4周时+13%，12周时+15%）和伸肌（4周时+27%，12周时+46%）的MVC扭矩均显著增加。第12周肘屈肌（+4%）和伸肌（+4%）的肌肉厚度也显著增加。在MVC过程中，两个肘屈肌的激动性EMG活动显著增加（4周时+31%，12周时+44%）和伸肌（4周时+27%，12周时+40%），两组肌群拮抗剂不自主共激活水平无变化。结论这些结果表明，最大自主共激活水平，收缩可用作增加拮抗肌对的大小和强度而不增加非随意共激活水平的训练模式。
PurposeThe present study examined neuromuscular adaptations following 12-week maximal voluntary co-contraction training.MethodsSixteen young men were allocated to training (TG,n= 9) or control (CG,n= 7) group. TG conducted a training program (3 days/week), which consisted of 4-s maximal voluntary contractions of elbow flexors and extensors by simultaneously contracting both muscle groups at 90° of the elbow joint, followed by 4-s muscle relaxation (10 repetitions/set, 5 sets/day) for 12 weeks. In addition to the muscle thicknesses of elbow flexors and extensors, the torque and electromyograms (EMGs) of the two muscle groups during isometric maximal voluntary contraction (MVC) were determined before (Pre), after 4 weeks, and 12 weeks of intervention.ResultsAfter intervention, CG showed no significant changes in all measured variables. In TG, MVC torque significantly increased in both elbow flexors (+13 % at 4 weeks and +15 % at 12 weeks) and extensors (+27 % at 4 weeks and +46 % at 12 weeks) from Pre. Muscle thickness also significantly increased in both elbow flexors (+4 %) and extensors (+4 %) at 12 weeks. Agonist EMG activities during MVC significantly increased in both elbow flexors (+31 % at 4 weeks and +44 % at 12 weeks) and extensors (+27 % at 4 weeks and +40 % at 12 weeks), without changes in antagonist involuntary coactivation level in both muscle groups.ConclusionThese results indicate that maximal voluntary co-contraction is applicable as a training modality for increasing the size and strength of antagonistic muscle pairs without increasing involuntary coactivation level.