Functional force stimulation alters motor neuron discharge patterns

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...

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Bibliographic Details
Published in:Frontiers in neuroscience 2023-12, Vol.17, p.1293017-1293017
Main Authors: Xu, Yaodan, Du, Zuyu, Cheng, Anyi, Lin, Runwei, Wang, Kaichen, Jin, Yibin, Dai, Chenyun, Xu, Lin
Format: Article
Language:English
Subjects:
blind source separation
Clinical trials
discharge timings
Electrodes
Electromyography
Firing pattern
functional force stimulation
high-density surface electromyography
motor unit synchronization
Neuromuscular diseases
Neurons
Neuroscience
Older people
Physiology
Strength training
Synchronization
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Summary: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. 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. 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.
ISSN:1662-4548
1662-453X
1662-453X
DOI:10.3389/fnins.2023.1293017