de Lima-Pardini Andrea Cristina, Coelho Daniel Boari, Silva Marina Brito, Azzi Nametala Maia, Martinelli Alessandra Rezende, Horak Fay Bahling, Teixeira Luis Augusto
Laboratory of Medical Investigation (LIM44), Institute of Radiology, Faculty of Medicine, University of São Paulo São Paulo, SP, Brazil.
Human Motor Systems Laboratory, Department of Human Movement Biodynamics, School of Physical Education and Sport, University of São Paulo São Paulo, SP, Brazil.
Front Aging Neurosci. 2014 Dec 3;6:327. doi: 10.3389/fnagi.2014.00327. eCollection 2014.
This study compared the effect of stability constraints imposed by a manual task on the adaptation of postural responses between 16 healthy elderly (mean age = 71.56 years, SD = 7.38) and 16 healthy young (mean age = 22.94 years, SD = 4.82) individuals. Postural stability was perturbed through unexpected release of a load attached to the participant's trunk while performing two versions of a voluntary task: holding a tray with a cylinder placed with its flat side down (low constraint) or with its rolling round side down (high constraint). Low and high constraint tasks were performed in alternate blocks of trials. Results showed that young participants adapted muscular activation and kinematics of postural responses in association with previous experience with the first block of manual task constraint, whereas the elderly modulated postural responses based on the current manual constraint. This study provides evidence for flexibility of postural strategies in the elderly to deal with constraints imposed by a manual task.
本研究比较了一项手动任务施加的稳定性约束对16名健康老年人（平均年龄 = 71.56岁，标准差 = 7.38）和16名健康年轻人（平均年龄 = 22.94岁，标准差 = 4.82）姿势反应适应性的影响。在执行两种版本的自愿任务时，通过意外释放连接在参与者躯干上的负载来干扰姿势稳定性：手持一个托盘，盘上放置一个圆柱体，圆柱体平面朝下（低约束）或滚动面朝下（高约束）。低约束和高约束任务在交替的试验块中进行。结果表明，年轻参与者根据手动任务约束的第一个块的先前经验，调整了姿势反应的肌肉激活和运动学，而老年人则根据当前的手动约束来调节姿势反应。本研究为老年人姿势策略的灵活性提供了证据，以应对手动任务施加的约束。
