部绑架器疲劳对老年人步行不稳定的影响
Andrew D Shelton1, Vicki S Mercer2, Katherine R Saul3
1Lampe Joint Department of Biomedical Engineering, University of North Carolina at Chapel Hill & North Carolina State University, Chapel Hill, North Carolina, United States.
Journal of neurophysiology
|September 12, 2025
概括
在老年人中,部绑架器疲劳会损害平衡控制,在横向扰动时增加不稳定性. 然而,在走路时调整脚部位置的能力仍然不受这种疲劳的影响.
科学领域:
- 老年学和生物力学
- 衰老的神经科学 衰老的神经科学
- 肌肉骨健康 肌肉骨健康
背景情况:
- 中侧稳定性对于老年人安全导航至关重要,并且严重依赖部绑架肌肉的控制.
- 肌肉疲劳严重影响力响应能力和反应能力,以平衡挑战.
研究的目的:
- 为了研究部绑架器疲劳对老年人的步行不稳定性的影响.
- 为了确定部绑架器疲劳是否会损害中侧边行走平衡控制,并影响对侧侧扰动和脚位调整的反应.
主要方法:
- 通过连续的横向步骤诱导部绑架器疲劳.
- 在疲劳后评估关节中部 (GMed) 电肌图 (EMG) 中位频率和最大异面力变化.
- 评估了对侧侧腰拉动扰动的脆弱性,以及在侧侧脚放置任务上的表现.
- 利用肌肉骨建模来模拟疲劳条件下的平衡恢复.
主要成果:
- 连续横向步进显著疲劳的部绑架器 (GMed EMG中位数频率下降16%,最大异位力下降9%).
- 疲劳增加了对侧向扰动的脆弱性,导致侧向移位更大 (14%) 并需要更大的稳定边际 (11%).
- 在侧脚放置任务上的表现并没有受到部绑架器疲劳的显著影响.
结论:
- 部绑架器疲劳会影响老年人的中侧平衡控制,增加对外部干扰反应的不稳定性.
- 肌肉骨模型表明,在横向平衡恢复期间,身体可以弥补大量的部绑架器疲劳 (高达55%).
- 研究结果强调了运动干预措施的重要性,以减少疲劳和保持老年人群的平衡.
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