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首页> 外文期刊>Gait & posture >Does visual augmented feedback reduce local dynamic stability while walking?
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Does visual augmented feedback reduce local dynamic stability while walking?

机译：视觉增强反馈会降低行走时的局部动态稳定性吗？

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Augmented feedback is frequently used in gait training to efficiently correct specific gait patterns in patients with different disorders. The patients use this external augmented feedback to align actual movements in a way that predefined gait characteristics can be achieved. Voluntary changes of gait characteristics are reported to reduce local dynamic stability (LDS) which in turn is associated with increased risk of falling. The aim of this study was to evaluate the instantaneous effect of visual feedback, provided to help patients to correct frontal plane pelvis and trunk movements, on the LDS of pelvis and trunk. Kinematic gait data was captured in ten women with gait disorders. The effect of visual feedback on LDS, quantified with the largest Lyapunov exponent, of walking was examined. We found a significant decreased LDS (e.g. pelvis: p =.009) in our subjects when they were using visual augmented feedback. Our data suggest that the use of visual augmented feedback causes less stable gait patterns indicating a reduced ability to respond to small perturbations which might increase risk of falling. Therefore, researchers or clinicians who aim to correct gait patterns through real time based external augmented feedback should consider the potential negative effect on gait stability. It should be evaluated if the possible increased fall risk provoked by visual feedback exceeds possible increases in fall risk induced by conventional gait-retraining interventions. The external validity of the study is limited because of the low sample size and inhomogeneous group characteristics. Thus, further studies including homogeneous cohorts are required. (C) 2015 Elsevier B.V. All rights reserved.
机译：步态训练中经常使用增强反馈，以有效纠正患有不同疾病的患者的特定步态模式。患者使用此外部增强反馈以可以实现预定义步态特征的方式对齐实际运动。据报道，步态特征的自愿改变会降低局部动态稳定性（LDS），从而降低跌倒的风险。这项研究的目的是评估视觉反馈的瞬时效果，以帮助患者纠正额骨盆和躯干的LDS的额骨盆骨和躯干运动。运动步态数据被捕获在十名步态障碍的妇女。检查了视觉反馈对LDS的影响，并用最大的Lyapunov指数对步行进行了量化。当我们的受试者使用视觉增强反馈时，我们发现他们的LDS显着降低（例如骨盆：p = .009）。我们的数据表明，视觉增强反馈的使用会导致步态模式不稳定，表明对小扰动的反应能力降低，这可能会增加跌倒的风险。因此，旨在通过基于实时外部增强反馈来纠正步态模式的研究人员或临床医生应考虑对步态稳定性的潜在负面影响。应该评估视觉反馈引起的跌倒风险增加是否超过传统步态再训练干预所导致的跌倒风险增加。该研究的外部有效性受到限制，因为样本量少且群体特征不均一。因此，需要进一步的研究，包括同类研究。 （C）2015 Elsevier B.V.保留所有权利。

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