Visuomotor adaptation of voluntary step initiation in older adults.
Visuomotor adaptation of voluntary step initiation in older adults.
复制标题
DOI：
10.1016/j.gaitpost.2009.10.001
复制
发表时间：
2010-02
期刊：
影响因子：
2.4
通讯作者：
Morton, Susanne M.
中科院分区：
文献类型：
--
作者：
Tseng, Shih-Chiao;Stanhope, Steven J.;Morton, Susanne M.
有人建议，老年人的步态和姿势的前馈规划会减弱。电机自适应是一种可以更新或微调前馈命令的机制。因此，如果老年人的前馈机制减弱，运动适应也可能受到限制。该研究的目的是比较健康老年人与年轻人在应对新的视觉感官扰动时产生自愿步进运动适应的能力。我们记录了 18 名健康老年人和 18 名年轻人在基线和适应踏步块期间的踏步动作。在基线期间，步进目标保持静止；在适应过程中，通过在中步期间横向移动目标来引入视觉扰动。我们通过端点准确性和运动持续时间的改善来衡量各组之间的适应性。老年人对迈步准确度的调整与年轻人相似（准确度提高：老年人组与年轻人组分别为 29.7 ± 27.6% 与 37.3 ± 22.9%，p = 0.375），但在运动过程中表现出明显的缓慢。因此，老年人能够达到几乎与年轻人相当的准确度水平，但只是以牺牲运动速度为代价，至少在早期适应期间是如此（运动持续时间：1143.7 ± 170.6 ms vs. 956.0 ± 74.6 ms，p < 0.001）。然而，通过练习，他们能够减少移动时间，并将速度和准确性提高到与年轻人相似的水平。这些发现表明，如果有足够的练习，老年人可能保留逐步适应环境变化或新需求的能力。
It has been suggested that feedforward planning of gait and posture is diminished in older adults. Motor adaptation is one mechanism by which feedforward commands can be updated or fine-tuned. Thus, if feedforward mechanisms are diminished in older adults, motor adaptation is also likely to be limited. The purpose of the study was to compare the ability of healthy older versus young adults in generating a voluntary stepping motor adaptation in response to a novel visual sensory perturbation. We recorded stepping movements from 18 healthy older and 18 young adults during baseline and adaptation stepping blocks. During baseline, the stepping target remained stationary; in adaptation, a visual perturbation was introduced by shifting the target laterally during mid-step. We compared adaptation between groups, measured by improvements in endpoint accuracy and movement duration. Older adults adapted stepping accuracy similarly to young adults (accuracy improvement: 29.7 ± 27.6% vs. 37.3 ± 22.9%, older vs. young group respectively, p = 0.375), but showed significant slowness during movement. Thus older adults were able to achieve accuracy levels nearly equivalent to younger adults, but only at the expense of movement speed, at least during the early adaptation period (movement duration: 1143.7 ± 170.6 ms vs. 956.0 ± 74.6 ms, p < 0.001). With practice, however, they were able to reduce movement times and gain speed and accuracy to levels similar to young adults. These findings suggest older adults may retain the ability for stepping adaptations to environmental changes or novel demands, given sufficient practice.
登录
查看更多内容
影响因子：
4.8
作者：
Bastian AJ
通讯作者：
Bastian AJ
DOI：
10.1016/s0003-9993(98)90425-7
发表时间：
1998-12-01
影响因子：
4.3
作者：
Polcyn, AF;Lipsitz, LA;Collins, JJ
通讯作者：
Collins, JJ
影响因子：
2.4
作者：
Brunt, D;Santos, V;Levy, C
通讯作者：
Levy, C
影响因子：
2.5
作者：
BURLEIGH, AL;HORAK, FB;MALOUIN, F
通讯作者：
MALOUIN, F
DOI：
10.1111/j.1532-5415.2004.52353.x
发表时间：
2004-08-01
影响因子：
6.3
作者：
Meher, I;Oddsson, LIE
通讯作者：
Oddsson, LIE