Department of Health and Human Performance, University of Houston, Houston, TX 77204, USA.
Exp Brain Res. 2013 Aug;229(2):273-84. doi: 10.1007/s00221-013-3644-8. Epub 2013 Jul 14.
We investigated within- and between-hands grip-load force coordination in both healthy young and older adult participants during bimanual tasks involving realistic actions. Age-related changes in manual behaviors such as grip force production and safety margins were expected in older adults. Within-hand grip-load coordination was expected to decrease with aging during the performance of dynamic actions, but not static actions. The effects of task and hand dominance on task performance were also evaluated. Grip force production increased with age; however, changes in fingertip frictional properties with aging increased the risk of object slip. Indices of within-hand grip-load coordination did not alter with age, but such indices were affected by task goals. The action of connecting two independent objects, particularly with rotational action, was associated with declines in all indices of within- and between-hands force coordination, independent of age. Evidence of task-specific differences in within-hand grip-load coordination in the current data set suggests that individual hand specification emerges and persists with age in everyday bimanual prehension tasks, independent of the action role assigned to the dominant and non-dominant hands.
我们研究了健康的年轻和老年参与者在涉及真实动作的双手任务中，双手握持力的协调情况。预计老年人在抓握力产生和安全裕度等手动行为方面会出现与年龄相关的变化。在执行动态动作时，预计随着年龄的增长，双手之间的握持力协调会降低，但在执行静态动作时则不会。我们还评估了任务和手优势对任务表现的影响。抓握力随着年龄的增长而增加；然而，随着年龄的增长，指尖摩擦特性的变化增加了物体滑动的风险。双手之间的握持力协调指标并没有随年龄而改变，但这些指标会受到任务目标的影响。连接两个独立物体的动作，特别是带有旋转动作的动作，与双手力协调的所有指标都呈下降趋势，与年龄无关。当前数据集在手的握力协调中的任务特异性差异的证据表明，个体手的特定性在手的日常双抓握任务中随着年龄的增长而出现并持续存在，与分配给优势手和非优势手的动作角色无关。
