Kinesthetic motor imagery and spinal excitability: The effect of contraction intensity and spatial localization
Kinesthetic motor imagery and spinal excitability: The effect of contraction intensity and spatial localization
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DOI：
10.1016/j.clinph.2008.04.004
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发表时间：
2008-08-01
影响因子：
4.7
通讯作者：
Ploutz-Snyder, Lori L.
中科院分区：
文献类型：
--
作者：
Cowley, Patrick M.;Clark, Brian C.;Ploutz-Snyder, Lori L.
目的：关于运动想象（MI）是否调节脊髓兴奋性的数据是模棱两可的。本研究的目的是确定是否想象的左足底屈肌（PF）的肌肉收缩改变脊髓兴奋性，如果是这样，以确定这种改变是否是强度依赖性和/或本地化的目标肌肉。我们的研究问题需要两个experiments.Methods：在实验1中，16名健康志愿者进行想象的肌肉收缩使用动觉的方法与他们的左PF在25%和100%的想象的努力（IE）。比目鱼肌H-反射在三种条件下，这是由约15秒分离：休息（前MI），MI期间，和恢复（MI停止后）。在实验2中，一个子集的受试者从实验I进行MI与他们的左PF在100%的IE，而无论是比目鱼肌或桡侧腕屈肌（FCR）H-reflexweredmeasured.Results：在实验1中，我们观察到一个促进比目鱼肌H-波振幅在MI相比，休息和恢复条件（p < 0.05）。比目鱼肌H波振幅在100%时大于25%时（p < 0.05）。实验2中，在左侧PF的想象肌肉收缩过程中，比目鱼肌和FCR H波振幅增加（p < 0.05）。这些变化是独立的自愿muscle activity.Conclusions：这些研究结果表明，MI可以增加脊髓兴奋性的强度想象的努力，但这种效果是不完全本地化的任务特定muscle.Significance：这些数据提供的证据表明，MI可以增加脊髓兴奋性在健康受试者，这表明未来的研究是必要的，以检查这种效果的临床相关性。需要这些研究来帮助建立一个治疗理论，通过该理论来推进使用MI的运动功能康复。(c)2008年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: Data on whether motor imagery (MI) modulates spinal excitability are equivocal. The purpose of this study was to determine if imagined muscle contractions of the left plantar flexor (PF) alter spinal excitability, and if so, to determine whether this alteration is intensity dependent and/or localized to the target muscles. Our research questions required two experiments.Methods: In experiment 1, 16 healthy volunteers performed imagined muscle contractions using a kinesthetic approach with their left PF at 25% and 100% of imagined effort (IE). The soleus H-reflex was evoked during three conditions, which were separated by about 15 s: rest (preceding MI), during MI, and recovery (following the cessation of MI). In experiment 2, a subset of subjects from experiment I performed MI with their left PF at 100% of IE, while either the soleus or flexor carpi radialis (FCR) H-reflex was measured.Results: In experiment 1, we observed a facilitation of soleus H-wave amplitude during MI compared to the rest and recovery conditions (p < 0.05). Furthermore, the soleus H-wave amplitude was greater during 100% than 25% of IE (p < 0.05). In experiment 2, soleus and FCR H-wave amplitude increased during imagined muscle contractions of the left PF (p < 0.05). These changes were independent of voluntary muscle activity.Conclusions: These findings suggest MI can increase spinal excitability by the intensity of imagined effort, but this effect is not fully localized to the task specific muscle.Significance: These data provide evidence that MI can increase spinal excitability in healthy subjects, which suggests future studies are warranted to examine the clinical relevance of this effect. These studies are needed to help establish a therapeutic theory by which to advance motor function rehabilitation using MI. (c) 2008 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.