Jongman Vera, Lamoth Claudine J C, van Keeken Helco, Caljouw Simone R
University Medical Centre Groningen, University of Groningen, the Netherlands.
Stud Health Technol Inform. 2012;181:93-7.
Impaired postural control with muscle weakness is an important predictor of falls within the elderly population.Particular daily activities that require weight shifting in order to be able to reach a specific target (a cup on a table) require continuous adjustments to keep the body's center of mass balanced. In the present study postural control was examined in healthy elderly and young subjects during a task in which subjects had to move the body's center of mass towards a virtual target on a screen that appeared at predictable and unpredictable locations. Postural control decreased with unpredictable targets, e.g. movement time was larger, trajectories more irregular. The results indicate that even though older individuals clearly benefitted from the early release of target location information, young individuals improved even more when target information became available.This indicates that the young were better able to use this information prospectively for executing the target directed movement quickly and accurately.
肌肉无力导致的姿势控制受损是老年人群跌倒的重要预测指标。特定的日常活动需要进行体重转移才能够到特定目标（桌子上的一个杯子），这需要持续调整以保持身体重心平衡。在本研究中，对健康的老年人和年轻人在一项任务中的姿势控制进行了检查，在该任务中，受试者必须将身体重心移向屏幕上出现在可预测和不可预测位置的虚拟目标。不可预测的目标会导致姿势控制能力下降，例如移动时间更长，轨迹更不规则。结果表明，尽管老年人显然从目标位置信息的提前释放中受益，但当目标信息可用时，年轻人的改善更大。这表明年轻人更能够前瞻性地利用这些信息快速准确地执行目标导向运动。
