Age-related kinematic differences as influenced by task difficulty, target size, and movement amplitude
Age-related kinematic differences as influenced by task difficulty, target size, and movement amplitude
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DOI：
10.1093/geronb/57.1.p54
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发表时间：
2002-01-01
影响因子：
6.2
通讯作者：
Stelmach, GE
中科院分区：
文献类型：
--
作者：
Ketcham, CJ;Seidler, RD;Stelmach, GE
15名老年人（M = 68岁）和15名年轻人（M= 23岁）参加了一项速度-准确性任务，在该任务中，在数字化平板电脑上进行瞄准运动，以评估老年人的运动减慢和变异性。分别分析了目标大小和运动幅度的影响，以确定它们是否对年轻人和老年人的表现有不同的影响。当目标大小增加时，老年人并没有增加主要子运动中的相对距离。当运动幅度增加时，老年人没有将运动速度缩放到与年轻人相同的幅度。无法缩放速度和无法增加在主要子运动中行进的相对距离都有助于在老年人中观察到的更慢、更可变的运动，这取决于任务参数。因此，这些数据表明，操纵目标大小和运动幅度产生两个不同的因素，有助于老年人的运动缓慢。
Fifteen older adults (M = 68 years old) and 15 young adults (M= 23 years old) participated in a speed-accuracy task in which aiming movements were performed on a digitizing tablet to assess movement slowing and variability in older adults. Target-size and movement amplitude influences were analyzed separately to determine if they affected the performance of the young and older adults differently. When target size was increased, older adults did not increase the relative distance traveled in the primary submovement. When movement amplitude was increased, older adults did not scale movement velocities to the same magnitude as young adults did. Both the inability to scale velocity and the inability to increase the relative distance traveled in the primary submovement contribute to slower, more variable movements observed in older adults depending on task parameters. Thus, these data reveal that manipulation of target size and movement amplitude yield two distinct factors that contribute to slowness of movement in older adults.