Is the prioritization of postural control altered in conditions of postural threat in younger and older adults?
Is the prioritization of postural control altered in conditions of postural threat in younger and older adults?
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DOI：
10.1093/gerona/57.12.m785
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发表时间：
2002-12-01
影响因子：
5.1
通讯作者：
Gage, WH
中科院分区：
文献类型：
--
作者：
Brown, LA;Sleik, RJ;Gage, WH
背景本研究的目的是确定在不同的姿势威胁条件下，年轻人和老年人的姿势控制对次要任务性能的优先顺序是否改变。15名健康的老年人（平均年龄= 69.53 ± 5.78）和15名年轻人（平均年龄= 22.00 ± 2.17）在四种姿势威胁条件下进行布鲁克斯空间字母任务（BST）。收集皮肤电传导（GSC）以测量生理唤醒的变化。BST任务持续时间用于测量认知表现的变化，压力中心（COP）面积用于确定每个测试条件下姿势稳定性的变化。基于测试条件下BST和COP的相对变化计算优先级指数。该测量被用来量化在姿势威胁的条件下姿势控制和次要任务性能之间的关系的变化。措施的GSC增加在年轻人和老年人的条件下，增加姿势的威胁。优先化指数分数显示，更多的老年人比年轻人优先考虑的姿势控制次要任务性能的条件下，增加姿势threaten.Conclusions。改变姿势威胁的环境背景可能会导致老年人姿势控制和次要任务性能之间的优先级的修改。这种关系可能会影响姿势控制的情况下，不提供恶化的次要任务的性能。
Background. The purpose of this study was to determine if the prioritization of postural control over secondary task performance is altered in younger and older adults under different conditions of postural threat.Methods. Fifteen healthy older adults (mean age = 69.53 +/- 5.78) and 15 younger adults (mean age = 22.00 +/- 2.17) performed Brooks' Spatial Letter Task (BST) while standing in four conditions of postural threat. Galvanic skin conductance (GSC) was collected to measure changes in physiological arousal. BST task duration was used to measure changes in cognitive performance, and center of pressure (COP) area was used to determine changes in postural stability across each of the testing conditions. A prioritization index was calculated based on the relative change in BST and COP across testing conditions. This measure was used to quantify changes in the relationship between postural control and secondary task performance under conditions of postural threat.Results. Measures of GSC increased in younger and older adults in response to conditions of increased postural threat. Prioritization index scores revealed that a greater number of older adults than younger adults prioritized postural control over secondary task performance under conditions of increased postural threat.Conclusions. Environmental contexts that alter postural threat may lead to modifications in the prioritization between postural control and secondary task performance among older adults. This relationship may have implications for postural control under situations that do not afford deterioration in secondary task performance.