Normal aging affects unconstrained three-dimensional reaching against gravity with reduced vertical precision and increased co-contraction: a pilot study.
Normal aging affects unconstrained three-dimensional reaching against gravity with reduced vertical precision and increased co-contraction: a pilot study.
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DOI：
10.1007/s00221-021-06280-9
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发表时间：
2022-04
影响因子：
2
通讯作者：
Jonkers, Ilse
中科院分区：
文献类型：
--
作者：
Wittenberg, George F.;Tian, Jing;Kortzorg, Nick;Wyers, Lore;Van Halewyck, Florian;Boisgontier, Matthieu P.;Levin, Oron;Swinnen, Stephan P.;Jonkers, Ilse
在太空中触及物体是许多日常生活活动的基础，在中风后的康复和其他神经和骨科疾病中非常重要。世纪以来，它一直是运动控制和神经科学研究的对象，但研究往往限制运动以消除重力的影响或减少自由度。在一些研究中，衰老已被证明会降低目标的准确性，其机制被认为是矫正运动受损。我们试图探索这种准确性的变化如何与手指，肩膀和肘部运动的变化在性能达到运动与重力的正常影响，不受约束的手的运动，和稳定的目标位置。在14名年轻人（25±6岁）和10名老年人（68±3岁）中收集了三维运动学数据和肌电图，这些数据是在参与者面前垂直对齐的三个目标的第二次长距离到达过程中收集的。老年人比年轻人需要更长的时间来启动一个动作，并且在他们的初始和最终动作中更多变和不准确。目标高度对老年人的轨迹曲率变异性的影响大于年轻人，在峰值速度附近，老年人相对于目标位置的角度变异性更大。上肢多自由度的使用存在显著的年龄相关差异，老年组肩外展的变异性较小。肌肉激活模式相似，除了较高的二头肌-三头肌共同收缩和紧张水平的一些近端肌肉激活。这些结果表明，在运动规划和针对可预测力的伸展运动的在线校正中存在与年龄相关的缺陷（即，重力），当它没有被机械支撑补偿时。
Reaching for an object in space forms the basis for many activities of daily living and is important in rehabilitation after stroke and in other neurological and orthopedic conditions. It has been the object of motor control and neuroscience research for over a century, but studies often constrain movement to eliminate the effect of gravity or reduce the degrees of freedom. In some studies, aging has been shown to reduce target accuracy, with a mechanism suggested to be impaired corrective movements. We sought to explore how such changes in accuracy relate to changes in finger, shoulder and elbow movements during performance of reaching movements with the normal effects of gravity, unconstrained hand movement, and stable target locations. Three-dimensional kinematic data and electromyography were collected in 14 young (25±6 years) and 10 older adults (68±3 years) during second-long reaches to three targets aligned vertically in front of the participants. Older adults took longer to initiate a movement than the young adults and were more variable and inaccurate in their initial and final movements. Target height had greater effect on trajectory curvature variability in older than young adults, with angle variability relative to target position being greater in older adults around the time of peak speed. There were significant age-related differences in use of the multiple degrees of freedom of the upper extremity, with less variability in shoulder abduction in the older group. Muscle activation patterns were similar, except for a higher biceps-triceps co-contraction and tonic levels of some proximal muscle activation. These results show an age-related deficit in the motor planning and online correction of reaching movements against a predictable force (i.e., gravity) when it is not compensated by mechanical support.
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影响因子：
2.5
作者：
Gribble, PL;Mullin, LI;Mattar, A
通讯作者：
Mattar, A
影响因子：
--
作者：
Boisgontier, Matthieu P.;Nougier, Vincent
通讯作者：
Nougier, Vincent
闭环任务难度适应虚拟现实中的到达训练训练有助于进行中风康复的外骨骼。
影响因子：
4.3
作者：
Grimm F;Naros G;Gharabaghi A
通讯作者：
Gharabaghi A
影响因子：
2
作者：
Bennett, Simon J.;Elliott, Digby;Rodacki, Andre
通讯作者：
Rodacki, Andre
影响因子：
5.7
作者：
Boudrias, Marie-Helene;Goncalves, Carla Sa;Ward, Nick S.
通讯作者：
Ward, Nick S.