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首页> 美国卫生研究院文献>Journal of Neurophysiology >Synchronization of motor unit firings: an epiphenomenon of firing rate characteristics not common inputs
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Synchronization of motor unit firings: an epiphenomenon of firing rate characteristics not common inputs

机译：电机点火的同步：点火速率特性的现象不是常见的输入

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Synchronous motor unit firing instances have been attributed to anatomical inputs shared by motoneurons. Yet, there is a lack of empirical evidence confirming the notion that common inputs elicit synchronization under voluntary conditions. We tested this notion by measuring synchronization between motor unit action potential trains (MUAPTs) as their firing rates progressed within a contraction from a relatively low force level to a higher one. On average, the degree of synchronization decreased as the force increased. The common input notion provides no empirically supported explanation for the observed synchronization behavior. Therefore, we investigated a more probable explanation for synchronization. Our data set of 17,546 paired MUAPTs revealed that the degree of synchronization varies as a function of two characteristics of the motor unit firing rate: the similarity and the slope as a function of force. Both are measures of the excitation of the motoneurons. As the force generated by the muscle increases, the firing rate slope decreases, and the synchronization correspondingly decreases. Different muscles have motor units with different firing rate characteristics and display different amounts of synchronization. Although this association is not proof of causality, it consistently explains our observations and strongly suggests further investigation. So viewed, synchronization is likely an epiphenomenon, subject to countless unknown neural interactions. As such, synchronous firing instances may not be the product of a specific design and may not serve a specific physiological purpose. Our explanation for synchronization has the advantage of being supported by empirical evidence, whereas the common input does not.
机译：同步电机单元点火实例已归因于运动神经元共享的解剖学输入。但是，缺乏经验证据来证实这样的观念，即在自愿条件下，共同投入会引发同步。我们通过测量运动单位动作电位列车（MUAPT）之间的同步性来测试这一概念，当它们的开火速率从相对较低的力水平向较高的收缩水平内发展时。平均而言，同步度随着力的增加而降低。通用输入概念没有为观察到的同步行为提供任何经验支持的解释。因此，我们研究了更可能的同步解释。我们的17,546个配对MUAPT的数据集显示，同步程度随电机单位点火率的两个特征而变化：相似性和作为力函数的斜率。两者都是运动神经元激发的量度。随着由肌肉产生的力的增加，击发速率斜率减小，并且同步相应地减小。不同的肌肉的运动单位具有不同的放电速率特性，并显示不同的同步量。尽管这种联系不是因果关系的证明，但它始终如一地解释了我们的观察结果，并强烈建议进一步研究。这样看来，同步可能是一种现象，受到无数未知的神经相互作用的影响。因此，同步触发实例可能不是特定设计的产物，并且可能无法满足特定的生理目的。我们对同步的解释的优点是有经验证据支持，而普通输入则没有。

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