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首页> 外文期刊>The European Journal of Neuroscience >Voluntary suppression of associated activity decreases force steadiness in the active hand
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Voluntary suppression of associated activity decreases force steadiness in the active hand

机译：相关活动的自愿抑制减少了活跃的手中的力量稳定性

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摘要

Unilateral muscle contractions are often accompanied by the activation of the ipsilateral hemisphere, producing associated activity (AA) in the contralateral homologous muscles. However, the functional role of AA is not fully understood. We determined the effects of voluntary suppression of AA in the first dorsal interosseous (FDI), on force steadiness during a constant force isometric contraction of the contralateral FDI. Participants (n = 17, 25.5 years) performed two trials of isometric FDI contractions as steadily as possible. In Trial 1, they did not receive feedback or explicit instructions for suppressing the AA in the contralateral homologous FDI. In Trial 2, participants received feedback and were asked to voluntarily suppress the AA in the contralateral nontarget FDI. During both trials, corticospinal excitability and motor cortical inhibition were measured. The results show that participants effectively suppressed the AA in the nontarget contralateral FDI (-71%), which correlated with reductions in corticospinal excitability (-57%), and the suppression was also accompanied by increases in inhibition (27%) in the ipsilateral motor cortex. The suppression of AA impaired force steadiness, but the decrease in force steadiness did not correlate with the magnitude of suppression. The results show that voluntary suppression of AA decreases force steadiness in the active hand. However, due to the lack of association between suppression and decreased steadiness, we interpret these data to mean that specific elements of the ipsilateral brain activation producing AA in younger adults are neither contributing nor detrimental to unilateral motor control during a steady isometric contraction.
机译：单侧肌肉收缩通常伴随着同侧大脑半球的激活，在对侧同源肌肉中产生相关活动（AA）。然而，AA的功能作用还没有完全理解。我们确定了在第一背侧骨间肌（FDI）中自愿抑制AA对对对侧FDI恒力等长收缩期间力稳定性的影响。参与者（n=17，25.5岁）尽可能稳定地进行了两次等长收缩试验。在试验1中，他们没有收到反馈或明确指示，以抑制对侧同源FDI中的AA。在试验2中，参与者收到反馈，并被要求在对侧非目标FDI中自愿抑制AA。在这两个试验中，皮质脊髓兴奋性和运动皮层抑制性都被测量。结果表明，受试者有效抑制了非靶向对侧FDI中的AA（-71%），这与皮质脊髓兴奋性的降低（-57%）相关，并且这种抑制还伴随着同侧运动皮层中抑制的增加（27%）。AA的抑制削弱了力的稳定性，但力稳定性的降低与抑制的大小无关。结果表明，主动手主动抑制AA会降低力的稳定性。然而，由于抑制和稳定性降低之间缺乏关联，我们将这些数据解释为，年轻成年人中产生AA的同侧大脑激活的特定元素对稳定等长收缩期间的单侧运动控制既没有贡献，也没有损害。

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