Quick foot placement adjustments during gait: direction matters

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• 作者：Wouter Hoogkamer ; Zrinka Potocanac ; Jacques Duysens
• 关键词：Falls ; Locomotion ; Obstacle avoidance ; Online corrections ; Stepping accuracy ; Walking
• 刊名：Experimental Brain Research
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：233
• 期：12
• 页码：3349-3357
• 全文大小：532 KB
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  Pélisson D, Prablanc C, Goodale MA, J
• 作者单位：Wouter Hoogkamer (1)
  Zrinka Potocanac (1)
  Jacques Duysens (1) (2)
  
  1. Department of Kinesiology, Movement Control and Neuroplasticity Research Group, KU Leuven, Tervuursevest 101 bus 1501, 3001, Louvain, Belgium
  2. Biomechatronics Lab, Mechatronics Department, Escola Politécnica da Universidade de S?o Paulo, S?o Paulo, Brazil
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Neurosciences
  Neurology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1106

文摘

To prevent falls, adjustment of foot placement is a frequently used strategy to regulate and restore gait stability. While foot trajectory adjustments have been studied during discrete stepping, online corrections during walking are more common in daily life. Here, we studied quick foot placement adjustments during gait, using an instrumented treadmill equipped with a projector, which allowed us to project virtual stepping stones. This allowed us to shift some of the approaching stepping stones in a chosen direction at a given moment, such that participants were forced to adapt their step in that specific direction and had varying time available to do so. Thirteen healthy participants performed six experimental trials all consisting of 580 stepping stones, and 96 of those stones were shifted anterior, posterior or lateral at one out of four distances from the participant. Overall, long-step gait adjustments were performed more successfully than short-step and side-step gait adjustments. We showed that the ability to execute movement adjustments depends on the direction of the trajectory adjustment. Our findings suggest that choosing different leg movement adjustments for obstacle avoidance comes with different risks and that strategy choice does not depend exclusively on environmental constraints. The used obstacle avoidance strategy choice might be a trade-off between the environmental factors (i.e., the cost of a specific adjustment) and individuals-ability to execute a specific adjustment with success (i.e., the associated execution risk). Keywords Falls Locomotion Obstacle avoidance Online corrections Stepping accuracy Walking