ALTERED MOVEMENT STRUCTURE IN THE ELDERLY

描述(改编自调查人员摘要)：随着个人年龄的增长， 它们的运动控制性能通常会恶化；尤其是， 他们的动作变得更慢、更多变。我们已经在一个 瞄准任务的减慢在很大程度上可以归因于老年人 受试者组织他们的动作。与年轻的受试者相比，他们 通常执行包含较短动作的瞄准动作。我们有 还证实，即使延长练习时间，老年人也不会改变 这些子运动之间的关系表明这些 对运动结构的修改反映了 马达系统。在这一应用中，通过一系列实验，我们寻求 来理解为什么老年人会改变他们的运动结构。四 主要的假设被检验，以探索这种情况的潜在原因 调整：增加肌肉协同收缩，增加力量变异性， 减少视觉-本体感觉校准，并减少协调控制。 在每个实验中，都采用了一种划分瞄准动作的方法 初级和次级次级运动，并研究它们之间的关系 根据这四个假说做出的预测。这个实验序列是 第一次全面研究中国的初级和次级次级运动 老年人。

DESCRIPTION (adapted from investigator's abstract): As individuals age, their movement control performance generally deteriorates; in particular, their movements get slower and more variable. We have shown that in an aiming task much of the slowing can be attributed to how the elderly subjects structure their movements. In comparison to younger subjects, they typically execute aiming movements that contain a shorter movement. We have also established that even with extended practice, the elderly do not change the relationship between these sub-movements which suggests that these modifications to the movement structure reflect fundamental changes in the motor system. In this application through a series of experiments, we seek to understand why the elderly alter the structure of their movements. Four major hypotheses are examined that probe potential causes of this modification: increase muscle cocontraction, increased force variability, reduced visuo-proprioceptive calibration, and reduced coordination control. In each experiment a methodology is employed that divides aiming movements into primary and secondary sub-movements and investigates their relationship to predictions made from the four hypotheses. This experimental sequence is the first to comprehensively examine primary and secondary sub-movements in the elderly.