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首页> 外文期刊>Journal of Neurophysiology >Reorganization of muscle synergies during multidirectional reaching in the horizontal plane with experimental muscle pain
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Reorganization of muscle synergies during multidirectional reaching in the horizontal plane with experimental muscle pain

机译：用实验肌肉疼痛在水平平面中达到多向肌肉协同效应的重组

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Muscle pain induces a complex reorganization of the motor strategy which cannot be fully explained by current theories. We tested the hypothesis that the neural control of muscles during reaching in the presence of nociceptive input is determined by a reorganization of muscle synergies with respect to control conditions. Muscle pain was induced by injection of hypertonic saline into the anterior deltoid muscle of eight men. Electromyographic (EMG) signals were recorded from 12 upper limb muscles as subjects performed a reaching task before (baseline) and after the injection of hypertonic (pain) saline, and after the pain sensation vanished. The EMG envelopes were factorized in muscle synergies, and activation signals extracted for each condition. Nociceptive stimulation resulted in a complex muscle reorganization without changes in the kinematic output. The anterior deltoid muscle activity decreased in all subjects while the changes in other muscles were subject specific. Three synergies sufficed to describe the EMG patterns in each condition, suggesting that reaching movements remain modular in the presence of experimental pain. Muscle reorganization in all subjects was accompanied by a change in the activation signals compatible with a change in the central drive to muscles. One, two or three synergies were shared between the baseline and painful conditions, depending on the subject. These results indicate that nociceptive stimulation may induce a reorganization of modular control in reaching. We speculate that such reorganization may be due to the recruitment of synergies specific to the painful condition.
机译：肌肉疼痛会诱导电机策略的复杂重组，这不能通过电流理论完全解释。我们测试了该假设，即在伤害性输入存在期间肌肉的神经控制是通过对控制条件的重组来确定肌肉协同作用的重组。通过将高渗盐水注射到八个男性前三角肌肌肉中诱导肌肉疼痛。当受试者之前，从12个上肢肌肉记录了电拍摄（EMG）信号以前（基线）和注射高渗（疼痛）盐水后，并且在疼痛感觉消失之后。 EMG信封在肌肉协同作用中进行了分解，并为每个条件提取激活信号。伤害刺激导致复杂的肌肉重组，而不会发生运动输出变化。所有受试者中的前三角肌活动减少，而其他肌肉的变化是特定的。三种协同作用足以描述每种条件中的EMG模式，表明在存在实验疼痛的情况下达到动作保持模块化。所有受试者中的肌肉重组伴随着与肌肉变化兼容的激活信号的变化。根据主题，在基线和痛苦的条件之间共享一个，两个或三个协同作用。这些结果表明，伤害性刺激可以诱导达到模块化控制的重组。我们推测此类重组可能是由于招募特异性痛苦条件的协同作用。

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