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Fatigue-related alterations to intra-muscular coherence

机译:疲劳相关的肌肉连贯性改变

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Oscillations in the alpha (8-12 Hz), beta (15-35 Hz) and gamma (35-60 Hz) frequency bands are commonly observed in recordings from the primary motor cortex. Coherence analysis based on motor unit spike trains is commonly used to quantify the degree of shared cortical input and the common modulation of motor unit discharge rates between muscles. In this study, intra-muscular coherence is used to investigate the alterations in the neural drive to the First Dorsal Interosseous muscle directly after a fatiguing contraction and following a rest period. An increase in coherence was observed for all frequency bands examined, which was statistically significant within the alpha and beta frequency ranges. There was no consistent difference between the coherence estimates obtained pre-fatigue and those reported after the recovery period. The increase in beta band coherence post-fatigue may indicate increased levels of cortical drive to the motor unit pool. Although the functional significance behind the increase in beta frequency coherence is unclear, it may aid in the coordination of muscle activity to compensate for the decline in the force generating capacity after fatigue.
机译:在初级电机皮层的记录中通常观察到α(8-12Hz),β(15-35Hz)和伽马(35-60Hz)频带中的振动。基于电机单元尖峰列车的相干性分析通常用于量化共享皮质输入的程度和肌肉之间的电机单元排出速率的共同调制。在这项研究中,肌肉间相干性用于在疲劳收缩和休息期后直接调查神经驱动器到第一背侧孔肌的变化。针对检查的所有频带观察到相干关系的增加,在α和β频率范围内具有统计学意义。在疲劳预疲劳和回收期后报告的那些之间没有一致的差异。疲劳后β带相干性的增加可能表明电机单元池的皮质驱动水平增加。虽然β频相干率的增加背后的功能意义尚不清楚,但它可能有助于协调肌肉活动,以补偿疲劳后发电能力的下降。

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