Comparative analysis of muscle coordination patterns underlying different types of stepping movements.

IF 1.7 4区 医学 Q4 NEUROSCIENCES
Lotte Hagedoorn, Edwin van Asseldonk, Vivian Weerdesteyn
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Abstract

Reactive stepping is crucial for preventing falls after losing balance. While perturbation-based training improves reactive step quality, voluntary step training appears less effective. To gain insight into the neural underpinnings of such task-specific effects, we examined the muscle coordination patterns of voluntary and reactive stepping. As an additional step type, we introduced action observation with motor simulation of reactive steps, as it has shown promise for improving reactive step quality without requiring real balance perturbations. Electromyographic signals were recorded from eight leg and trunk muscles of healthy young subjects (n = 15) during three step types: (1) reactive stepping following support-surface translations, (2) voluntary stepping in response to a visual stimulus, and (3) action observation with motor simulation of reactive steps, as demonstrated by a human actor. Each condition involved stepping with the right leg in five directions (anterior/45°anterior/lateral/45°posterior/posterior). Muscle synergy analysis was employed to identify muscle weights with corresponding temporal activation profiles, which were compared across step types. Step characteristics and body configurations at foot down were also compared. Three muscle synergies were consistently recruited across participants and step types. In reactive stepping, a majority of participants exhibited a fourth muscle synergy involving rectus femoris and soleus. Temporal activation coefficients and body configurations varied with step type. While largely similar muscle weights were found for the three types of stepping movements, higher levels of activation in reactive stepping presumably reflect the greater biomechanical challenge involved. These findings may help explain differences in effects between different step training protocols.

不同步进动作类型下肌肉协调模式的比较分析。
反应性步进是防止失去平衡后跌倒的关键。虽然基于扰动的训练提高了反应性步的质量,但自愿步的训练似乎效果较差。为了深入了解这种任务特异性效应的神经基础,我们检查了自愿和反应性踏步的肌肉协调模式。作为额外的步骤类型,我们引入了动作观察与运动模拟的反应步骤,因为它已经显示出改善反应步骤质量的希望,而不需要真正的平衡扰动。我们记录了健康年轻受试者(n = 15)的8块腿部和躯干肌肉在三种步态类型中的肌电图信号:(1)在支撑面平移后的反应性行走,(2)在视觉刺激下的自主行走,以及(3)通过运动模拟反应性行走的动作观察,由人类演员演示。每种情况都涉及右腿在五个方向(前/45°前/外侧/45°后/后)行走。肌肉协同分析用于识别肌肉重量与相应的时间激活谱,并比较跨步类型。并比较了两种动物的步长特征和身体形态。三种肌肉协同作用在参与者和步数类型中都是一致的。在反应性步进中,大多数参与者表现出涉及股直肌和比目鱼肌的第四肌肉协同作用。时间激活系数和体构型随台阶类型的不同而不同。虽然在三种类型的踏步运动中发现了大致相似的肌肉重量,但反应性踏步运动中较高的激活水平可能反映了所涉及的更大的生物力学挑战。这些发现可能有助于解释不同步骤训练方案之间效果的差异。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.60
自引率
5.00%
发文量
228
审稿时长
1 months
期刊介绍: Founded in 1966, Experimental Brain Research publishes original contributions on many aspects of experimental research of the central and peripheral nervous system. The focus is on molecular, physiology, behavior, neurochemistry, developmental, cellular and molecular neurobiology, and experimental pathology relevant to general problems of cerebral function. The journal publishes original papers, reviews, and mini-reviews.
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