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首页> 外文期刊>Clinical neurophysiology >Non-paretic quadriceps activity influences paretic quadriceps activity post-stroke.
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Non-paretic quadriceps activity influences paretic quadriceps activity post-stroke.

机译：非中风股四头肌活动会影响中风后中风股四头肌的活动。

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OBJECTIVE: Inappropriate muscle activity is common following stroke. Paretic muscle activation may be influenced by non-paretic volitional activation. We examined the influence of non-paretic quadriceps activation on paretic quadriceps excitability. METHODS: Individuals with chronic stroke performed bilateral and unilateral (paretic and non-paretic) maximum voluntary isometric contractions. Peak torque and muscle activity were compared between conditions. An instrumented tendon tapper elicited a patellar tendon reflex of the relaxed paretic leg while the non-paretic leg was relaxed and pre-activated. The threshold to elicit a paretic quadriceps response was compared between conditions. RESULTS: During the bilateral MVIC, the paretic quadriceps generated less absolute torque, but greater relative torque than the non-paretic side when normalized to the respective unilateral condition (p<0.05). During reflex testing, the tendon tapping threshold to elicit paretic muscle and torque responses decreased with non-paretic activity (p<0.05). CONCLUSIONS: Concurrent non-paretic activation resulted in a relative disinhibition of the paretic quadriceps. The paretic limb's inability to remain inactive during isolated non-paretic contractions implies increased excitation or decreased inhibition of paretic motor pools, although the source remains unknown. SIGNIFICANCE: Unwanted muscle activity during reciprocal tasks (gait training) may be due to contralateral effects of non-paretic muscle activity.
机译：目的：中风后常见肌肉活动不当。坐骨肌的激活可能受非坐骨的自愿性激活的影响。我们检查了非股四头肌激活对股四头肌兴奋性的影响。方法：患有慢性中风的人进行了双侧和单侧（局部和非局部）最大自愿等距收缩。比较各条件下的峰值扭矩和肌肉活动。仪器化的肌腱per缩引起松弛的paretic腿的pa腱反射，而非paretic的腿则放松并预先激活。在条件之间比较引发发作性股四头肌反应的阈值。结果：在双侧MVIC期间，当标准化为相应的单侧条件时，股四头肌产生的绝对转矩较小，但相对值大于非股侧（p <0.05）。在反射测试过程中，引起无节段活动的肌束轻拍阈值引起无节段活动的肌肉和扭矩响应降低（p <0.05）。结论：并发的非paretic激活导致paretic股四头肌相对抑制。尽管孤立的非paretic收缩期间paretic肢体无法保持非活动状态，但这暗示了paretic运动池的兴奋性增加或抑制降低，尽管其来源仍然未知。重要性：相互任务（步态训练）过程中不必要的肌肉活动可能是由于非腹部肌肉活动的对侧影响所致。

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