Age and falls history effects on antagonist leg muscle coactivation during walking with balance perturbations.
Age and falls history effects on antagonist leg muscle coactivation during walking with balance perturbations.
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DOI：
10.1016/j.clinbiomech.2018.09.011
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发表时间：
2018-11
期刊：
影响因子：
--
通讯作者：
Franz JR
中科院分区：
文献类型：
--
作者：
Thompson JD;Plummer P;Franz JR
受老年人依赖视觉反馈进行运动控制的启发，光流扰动提供了一个独特的机会来研究步行平衡控制中涉及的神经肌肉机制，包括对环境平衡挑战的响应的老化和福尔斯历史影响。具体而言，拮抗腿肌肉共激活，这在步行过程中随着年龄的增长而增加，被认为是对平衡控制中与年龄相关的缺陷的神经肌肉防御。本研究的目的是调查年龄和福尔斯历史对拮抗腿肌肉共激活在步行过程中有和没有不同幅度的光流扰动的影响。11名年轻人[平均（标准差）年龄：24.8（4.8）岁]，11名老年非跌倒者[75.3（5.4）岁]和11名老年跌倒者[年龄：78（7.6）岁]参加了这项研究。参与者完成了2分钟的步行试验，同时观看速度匹配的虚拟走廊，在某些情况下，包括内外侧光流扰动，旨在引起视觉感知的不平衡。我们首先发现正常行走时小腿拮抗肌的共激活随年龄增长而增加，与福尔斯史无关。我们还发现，老年人，而不是年轻人增加拮抗腿肌肉共激活的存在下，光流扰动，更广泛的影响，在老年人的历史福尔斯。我们的研究结果暗示，老年人在行走过程中对光流扰动的敏感性更高，这表明在更复杂和动态的日常环境中，不稳定的风险更高。这些发现也可能对设计创新的训练模式和预防福尔斯的神经肌肉目标产生更广泛的影响。
Inspired by a reliance on visual feedback for movement control in older age, optical flow perturbations provide a unique opportunity to study the neuromuscular mechanisms involved in walking balance control, including aging and falls history effects on the response to environmental balance challenges. Specifically, antagonist leg muscle coactivation, which increases with age during walking, is considered a neuromuscular defense against age-associated deficits in balance control. The purpose of this study was to investigate the effects of age and falls history on antagonist leg muscle coactivation during walking with and without optical flow perturbations of different amplitudes. Eleven young adults [mean (standard deviation) age: 24.8 (4.8) years], eleven older nonfallers [75.3 (5.4) years] and eleven older fallers [age: 78 (7.6) years] participated in this study. Participants completed 2-minute walking trials while watching a speed-matched virtual hallway that, in some conditions, included mediolateral optical flow perturbations designed to elicit the visual perception of imbalance. We first found that lower leg antagonist muscle coactivation during normal walking increased with age, independent of falls history. We also found that older but not young adults increased antagonist leg muscle coactivation in the presence of optical flow perturbations, with more pervasive effects in older adults with a history of falls. Our findings allude to a greater susceptibility to optical flow perturbations in older fallers during walking, which points to a higher potential for risk of instability in more complex and dynamic everyday environments. These findings may also have broader impacts related to the design of innovative training paradigms and neuromuscular targets for falls prevention.
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DOI：
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发表时间：
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影响因子：
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