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首页> 外文期刊>Journal of Biomechanics >Proprioceptive feedback contributes to the adaptation toward an economical gait pattern
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Proprioceptive feedback contributes to the adaptation toward an economical gait pattern

机译：Benrioceptive反馈有助于适应经济的步态模式

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Humans generally prefer gait patterns with a low metabolic cost, but it is unclear how such patterns are chosen. We have previously proposed that humans may use proprioceptive feedback to identify economical movement patterns. The purpose of the present experiments was to investigate the role of plantarflexor proprioception in the adaptation toward an economical gait pattern. To disrupt proprioception in some trials, we applied noisy vibration (randomly varying between 40-120 Hz) over the bilateral Achilles tendons while participants stood quietly or walked on a treadmill. For all 10 min walking trials, the treadmill surface was initially level before slowly increasing to a 2.5% incline midway through the trial without participant knowledge. During standing posture, noisy vibration increased sway, indicating decreased proprioception accuracy. While walking on a level surface, vibration did not significantly influence stride period or metabolic rate. However, vibration had clear effects for the first 23 min after the incline increase; vibration caused participants to walk with shorter stride periods, reduced medial gastrocnemius (MG) activity during mid-stance (30-65% stance), and increased MG activity during late-stance (65-100% stance). Over time, these metrics gradually converged toward the gait pattern without vibration. Likely as a result of this delayed adaptation to the new mechanical context, the metabolic rate when walking uphill was significantly higher in the presence of noisy vibration. These results may be explained by the disruption of proprioception preventing rapid identification of muscle activation patterns which allow the muscles to operate under favorable mechanical conditions with low metabolic demand. Published by Elsevier Ltd.
机译：人类通常更喜欢具有低代谢成本的步态模式，但目前尚不清楚如何选择这种模式。我们之前提出人类可以使用预言反馈来识别经济运动模式。目前实验的目的是探讨Plantarflexor Braincirection在适应经济步态模式的适应方面的作用。为了破坏一些试验中的预血基，我们在双边阿基群肌腱上施加嘈杂的振动（在40-120 Hz之间随机变化），而参与者静静地站立或走在跑步机上。对于所有10分钟的行走试验，跑步机表面最初是在慢慢增加到在没有参与者知识的情况下通过审判的2.5％倾斜的水平。在姿态姿势期间，嘈杂的振动增加摇摆，表明预防精度降低。在走上水平表面的同时，振动没有显着影响步幅期或代谢率。然而，在倾斜增加后，振动对前23分钟的效果明显;振动引起参与者在较短的步伐期间，在中姿势（30-65％姿势）期间减少内侧胃肠（Mg）活性，并在延迟姿势（65-100％）期间增加Mg活性。随着时间的推移，这些度量逐渐融合到没有振动的步态模式。由于这种延迟适应新的机械背景，在嘈杂的振动存在下，步行上坡的代谢率明显高。这些结果可以通过预防预防肌肉激活模式的快速鉴定来解释这些结果，这使得肌肉在具有低代谢需求的良好机械条件下运行。 elsevier有限公司出版

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