Fatigue-induced decline in low-frequency common input to bilateral and unilateral plantar flexors during quiet standing
Fatigue-induced decline in low-frequency common input to bilateral and unilateral plantar flexors during quiet standing
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安静站立时疲劳引起的双侧和单侧跖屈肌低频共同输入下降
DOI：
10.1016/j.neulet.2018.09.019
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发表时间：
2018
影响因子：
2.5
通讯作者：
Nojima Ippei
中科院分区：
文献类型：
--
作者：
Watanabe Tatsunori;Saito Kotaro;Ishida Kazuto;Tanabe Shigeo;Nojima Ippei
足底屈肌在保持安静站立时的平衡中起着至关重要的作用。本研究的目的是调查他们的疲劳对这些肌肉的共同输入的影响，使用连贯性分析。13名健康的年轻男性成年人安静地站在之前和之后的疲劳协议组成的脚跟抬起运动。记录两侧腓肠肌内侧肌和比目鱼肌的压力中心位移（COP）和肌电图（EMG）。计算了右腿两侧同源肌之间（双侧相干性）和单侧肌内（单侧相干性）的EMG-EMG相干性。前后和内外侧COP速度、内外侧COP SD和95%置信椭圆面积在疲劳后条件下大于疲劳前条件下。双侧和单侧的连贯性δ带，反映肌肉激活的共调节，和双边的连贯性α带，这是推测与皮层下的输入，是较小的后比前疲劳条件。单侧coherencein α和β带，反映生理性震颤和皮质脊髓驱动，分别，没有不同的前和后疲劳条件。有人建议，在安静的站立过程中，足底屈肌肌肉的低频共同输入减少疲劳收缩后，可能是通过改变姿势控制策略。
Plantar flexor muscles play a crucial role in maintaining balance during quiet standing. The purpose of this study was to investigate the effect of their fatigue on common input to these muscles, using a coherence analysis. Thirteen healthy young male adults stood quietly before and after a fatigue protocol consisting of a heel raise exercise. Center of pressure (COP) displacement and electromyograms (EMGs) from the bilateral medial gastrocnemius and soleus muscles were recorded. EMG-EMG coherences between the bilateral homologous muscles (bilateral coherence) and within the unilateral muscles (unilateral coherence) in the right leg were calculated. Anteroposterior and mediolateral COP speeds, mediolateral COP SD, and 95% confidence ellipse area were larger in post- than pre-fatigue condition. Bilateral and unilateral coherences in delta band, that reflect comodulation of muscle activation, and bilateral coherence in alpha band, that is supposedly associated with the subcortical inputs, were smaller in post- than pre-fatigue condition. Unilateral coherences in alpha and beta band, reflecting physiological tremor and corticospinal drive, respectively, were not different between pre- and post-fatigue conditions. It is suggested that the low-frequency common input to the plantar flexor muscles is reduced following the fatiguing contraction during quiet standing, likely by a change in the postural control strategy.
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