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在不对称地负载下关闭时,肌激活和关节空间

Lea Angst¹, Jan Harm Koolstra², Daniel Wiedemeier³

¹Clinic of Masticatory Disorders, Centre of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032, Zurich, Switzerland. lea.angst@zzm.uzh.ch.

Annals of biomedical engineering

|January 12, 2024

概括

这项研究揭示了大脑如何控制关闭在不均的负载下. 增加的不对称负载显著激活肌,可能保护关节 (TMJ).

科学领域:

生物力学生物力学
神经科学是一个神经科学.
牙科科学牙科科学

背景情况:

了解中枢神经系统 (CNS) 如何在动过程中控制肌肉至关重要.
在不对称负载下关闭过程中使用的特定神经肌肉策略仍然在很大程度上没有特征.
现有假设表明,最小化关节负荷 (MJL) 或最小化肌肉努力 (MME) 作为潜在的控制机制.

研究的目的:

为了实验性地研究中枢神经系统在不对称负荷下选择关关闭的神经肌肉策略.
量化在不对称负载期间肌激活和关节 (TMJ) 负荷的变化.
确定是否主要使用MJL或MME策略.

主要方法:

十个健康的受试者对不同不对称的下负荷 (0.0-2.0公斤) 进行了关闭运动.
使用电肌图 (EMG) 测量了肌活化.
通过动态立体测量评估最小关节内距离 (MID),以推断关节负荷.

主要成果:

不对称负载的增加显著增加了MID和前EMG的ipsilateral-contralateral差异 (p < 0.001,p = 0.01).
两个TMJ都在1公斤的不对称负载下经历了最大负载.
马塞特肌肉EMG显示,随着负载的增加,没有显著的变化.

结论:

不对称的下负荷改变TMJ空间和肌激活模式.
增加前肌活化可能表明保护性关节反应.
这些发现并不能最终支持MJL或MME假设的这一任务.

关键词:

生物力学生物力学按摩者肌肉的肌肉.尽量减少联合负荷的最小化.尽量减少肌肉的努力.骨肌的肌肉时间.部关节部关节

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