Anticipatory postural control strategies related to predictive perturbations
Anticipatory postural control strategies related to predictive perturbations
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DOI：
10.1016/j.gaitpost.2007.10.001
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发表时间：
2008-07-01
期刊：
影响因子：
2.4
通讯作者：
Voigt, Michael
中科院分区：
文献类型：
--
作者：
Laessoe, Uffe;Voigt, Michael
平衡反应可以被视为基于反馈的对感官信息的反应，但是当可以预测平衡威胁情况时，可以使用预期姿势控制策略。这项研究描述了与重复节律扰动相关的主动姿势调整的特征。此外，该研究旨在调查这些预期策略的年龄依赖性。 14 名年轻人（年龄 27 +/- 2 岁）和 10 名社区居住的老年人（76 +/- 5 岁）参与了这项研究。当参与者站在可移动测力板上时，评估压力位移中心。扰动包括平台的交替左/右额面倾斜或矢状面交替的向前/向后滑动。熟悉扰动后，通过双任务方法评估姿势控制的自动化。倾斜扰动前 200 ms 的压力位移中心与扰动的方向显着相关。在双重任务条件下，这种早期姿势调整显着增加。双重任务效应在老年人中更为明显，但由于个体间差异较大，这种年龄效应并不显着。作为对滑动扰动的反应的步进反应的频率随着调节而减少，但在双重任务条件下老年人中再次增加。结论：这项研究表明，年轻人和老年人都使用预期姿势控制策略来尽量减少可预测扰动的影响。当引入并发认知任务时，主动姿势调整会进一步增强。老年人的姿势控制似乎不太自动化，并且在非常具有挑战性的扰动期间变得不足。 (C) 2007 Elsevier B.V. 保留所有权利。
Balance reactions can be seen as responses to sensory information on a feedback basis, but when a balance threatening situation can be predicted, an anticipatory postural control strategy can be used. This study describes characteristics of proactive postural adjustments related to repetitive rhythmic perturbations. Furthermore, the study aimed to investigate age dependency of these anticipatory strategies.Fourteen young (age 27 +/- 2 years) and 10 community-dwelling elderly adults (76 +/- 5 years) participated in this study. Centre of pressure displacement was evaluated while the participants were standing on a moveable force plate. Perturbations consisted of alternating left/right frontal plane tilts of the platform or alternating forward/backward slides in the sagittal plane. Automation of postural control was evaluated by a dual task approach after familiarization to the perturbations.Centre of pressure displacement 200 ms before a tilt perturbation was significantly related to the direction of the perturbation. This early postural adjustment was significantly increased during the dual task condition. The dual task effect was more pronounced in the elderly, but this age-effect was not significant due to large inter-individual variation. The frequency of stepping reactions as response to slide perturbations decreased with conditioning, but increased again in the elderly during dual task condition.Conclusion: This study showed that both young and elderly use anticipatory postural control strategies to minimize the impact of predictable perturbations. The proactive postural adjustments are further enhanced when a concurrent cognitive task is introduced. Postural control seems less automated in elderly and becomes insufficient during very challenging perturbations. (C) 2007 Elsevier B.V. All rights reserved.