走向无监督的增量和比例肌肉控制,基于更高密度的表面电肌图
概括
这项研究引入了无监督的肌肉控制,使用表面电肌学 (sEMG) 来改善假肢的功能. 虽然参与者实现了多个肌肉协同作用的独立控制,但比例控制仍然是先进的假肢使用的挑战.
科学领域:
- 生物医学工程 生物医学工程
- 神经科学是一个神经科学.
- 康复技术 康复技术 康复技术
背景情况:
- 上肢的差异显著影响日常自主.
- 当前假肢的高废弃率来自复杂性和有限的功能.
- 先进的肌肉控制策略对于提高假肢能力至关重要.
研究的目的:
- 通过使用高密度表面电肌学 (sEMG) 进行完全无监督的增量肌控制的调查.
- 通过增量稀疏非负矩阵因子化 (ISNMF) 评估实时提取肌肉协同效应的可行性.
- 通过越来越多可控制的协同效应来评估用户的性能和工作量.
主要方法:
- 采用了两个32通道的sEMG手,用于实时肌肉协同提取.
- 使用增量稀疏非负矩阵因子化 (ISNMF) 进行无监督学习.
- 通过使用虚拟目标实现控制 (TAC) 测试,测试了八名身体健康的参与者.
主要成果:
- 参与者在全强度任务中表现出多达六种肌肉协同作用的独立控制.
- 进行比例控制是很有挑战性的,在半强度目标中,成功率的中位数为10%.
- 主观工作量显示,尽管任务复杂度增加,但增幅最小.
结论:
- 使用ISNMF完全不受监督的肌肉控制显示了先进的假肢应用的前景.
- 需要进一步完善训练协议和超参数调整.
- 需要对肢体差异的用户进行验证,以确认临床实用性.
相关概念视频
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When the neuron of a motor unit fires an action potential, it triggers a series of events, leading to a twitch contraction in the muscle fibers. The process of excitation-contraction coupling is crucial in relaying the action potential to the muscle fibers.
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
The latent period of contraction marks the onset of excitation-contraction coupling, when the action potential propagates across the sarcolemma, preparing the muscle fibers for contraction. As the fibers enter the contraction phase, the...
Muscle Stimulation Frequency
The contraction strength of muscles is regulated by motor neurons, which modulate the frequency of action potentials dispatched to the motor units based on the body's requirements. This process of varying the muscle stimulation frequency allows muscles to contract with a force that is precisely tailored to the needs of the moment, whether lifting a feather or a heavy box.
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Wave summation
At low firing rates, motor neurons induce individual twitch contractions in muscle fibers. These twitches...
Bode Plots Construction
The Bode plot is an essential tool in control system analysis, mapping the frequency response of a system through a magnitude plot and a phase plot, both against a logarithmic frequency axis. To construct a Bode plot, consider the transfer function H(ω):


