PDF(Pubmed)
Abstract：
UNASSIGNED: Beneficial effects have been observed for mechanical vibration stimulation (MVS), which are mainly attributed to tonic vibration reflex (TVR). TVR is reported to elicit synchronized motor unit activation during locally applied vibration. Similar effects are also observed in a novel vibration system referred to as functional force stimulation (FFS). However, the manifestation of TVR in FFS is doubted due to the use of global electromyography (EMG) features in previous analysis. Our study aims to investigate the effects of FFS on motor unit discharge patterns of the human biceps brachii by analyzing the motor unit spike trains decoded from the high-density surface EMG.
UNASSIGNED: Eighteen healthy subjects volunteered in FFS training with different amplitudes and frequencies. One hundred and twenty-eight channel surface EMG was recorded from the biceps brachii and then decoded after motion-artifact removal. The discharge timings were extracted and the coherence between different motor unit spike trains was calculated to quantify synchronized activation.
UNASSIGNED: Significant synchronization within the vibration cycle and/or its integer multiples is observed for all FFS trials, which increases with increased FFS amplitude. Our results reveal the basic physiological mechanism involved in FFS, providing a theoretical foundation for analyzing and introducing FFS into clinical rehabilitation programs.
UNASSIGNED: Eighteen healthy subjects volunteered in FFS training with different amplitudes and frequencies. One hundred and twenty-eight channel surface EMG was recorded from the biceps brachii and then decoded after motion-artifact removal. The discharge timings were extracted and the coherence between different motor unit spike trains was calculated to quantify synchronized activation.
UNASSIGNED: Significant synchronization within the vibration cycle and/or its integer multiples is observed for all FFS trials, which increases with increased FFS amplitude. Our results reveal the basic physiological mechanism involved in FFS, providing a theoretical foundation for analyzing and introducing FFS into clinical rehabilitation programs.
摘要：
■已观察到机械振动刺激（MVS）的有益效果，这主要归因于强直振动反射(TVR)。据报道，TVR在局部施加的振动期间会引起同步的电机单元激活。在称为功能力刺激（FFS）的新型振动系统中也观察到类似的效果。然而,由于在先前的分析中使用了全局肌电图（EMG）特征，因此对TVR在FFS中的表现表示怀疑。我们的研究旨在通过分析从高密度表面肌电图解码的运动单元尖峰序列，研究FFS对人类肱二头肌运动单元放电模式的影响。
■18名健康受试者自愿参加了不同幅度和频率的FFS训练。从肱二头肌记录了128个通道表面EMG，然后在运动伪影去除后进行解码。提取放电时间，并计算不同运动单位尖峰序列之间的相干性，以量化同步激活。
■在所有FFS试验中观察到振动周期和/或其整数倍内的显着同步，随着FFS振幅的增加而增加。我们的结果揭示了FFS涉及的基本生理机制，为将FFS分析和引入临床康复计划提供理论基础。
■18名健康受试者自愿参加了不同幅度和频率的FFS训练。从肱二头肌记录了128个通道表面EMG，然后在运动伪影去除后进行解码。提取放电时间，并计算不同运动单位尖峰序列之间的相干性，以量化同步激活。
■在所有FFS试验中观察到振动周期和/或其整数倍内的显着同步，随着FFS振幅的增加而增加。我们的结果揭示了FFS涉及的基本生理机制，为将FFS分析和引入临床康复计划提供理论基础。
