Increased rate of force development of elbow flexors by antagonist conditioning contraction
Increased rate of force development of elbow flexors by antagonist conditioning contraction
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DOI：
10.1016/j.humov.2009.02.005
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发表时间：
2009-08-01
影响因子：
2.1
通讯作者：
Kusakabe, Tatsumi
中科院分区：
文献类型：
--
作者：
Kamimura, Takashi;Yoshioka, Koichi;Kusakabe, Tatsumi
在健康受试者中研究了不同持续时间和强度的等长拮抗剂调节收缩（ACC）对肘关节屈肌收缩力、肌电图（EMG）振幅及其上升率的影响。我们特别关注了激动剂的最大初始力发展速率（dFagonist/dt(max)）的变化，该变化通过从表观初始力发展中减去拮抗剂力衰减来评估。虽然ACC对肘关节屈曲时的平均力没有统计学意义上的影响，但短时间（1-2秒）和大强度的ACC显著增加了dFagonist/dt（max）。同样，ACC不影响屈肘时肱二头肌肌电信号的均方根振幅，但显著提高了绝对肌电信号振幅的最大上升速率（dE/dt(max)）。这些结果表明，在健康参与者激动剂作用的初始阶段可以观察到ACC的促进作用，并且持续时间较短的ACC可能更有效。dE/dt（max）的增加表明神经活动的增加可能有助于拮抗条件促进力的发展。(C) 2009 Elsevier B.V.版权所有
The effects of isometric antagonist conditioning contraction (ACC) at various durations and intensities on the contractile force, electromyographic (EMG) amplitude, and their rates of rise of elbow flexor muscles were examined in healthy participants. In particular, we focused on the change in the maximum rate of initial force development of agonists (dFagonist/dt(max)), which was evaluated by subtracting antagonist force decaying from apparent initial force development. While the ACC caused no statistically significant effect on the average force during elbow flexion, dFagonist/dt(max) was significantly increased by the ACC of short durations (1-2 s) and large intensities. Similarly, the ACC did not affect the root mean square EMG amplitude of biceps brachii during elbow flexion, but significantly increased the maximum rate of rise of the absolute EMG amplitude (dE/dt(max)). These results suggested that facilitating effects of the ACC could be observed in the initial phase of agonist action in healthy participants, and ACC of shorter durations might be more effective. The increased dE/dt(max) suggested that increased neural activities might contribute to the antagonist conditioned facilitation of force development. (C) 2009 Elsevier B.V. All rights reserved.