Age-related changes in joint coordination during balance recovery
Age-related changes in joint coordination during balance recovery
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DOI：
10.1007/s11357-012-9422-x
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发表时间：
2013-08-01
期刊：
影响因子：
--
通讯作者：
Woollacott, Marjorie
中科院分区：
文献类型：
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作者：
Hsu, Wei-Li;Chou, Li-Shan;Woollacott, Marjorie
福尔斯对老年人来说是一个重大的健康风险，并且经常导致需要医疗护理的伤害。控制全身质心（COM）运动的能力降低已被证明可以识别老年人有跌倒的风险。为了探索有效的预防策略和干预措施，我们研究了成年人在多关节协调方面的年龄相关差异，以控制平衡恢复期间的COM。我们使用不受控流形（UCM）分析，它可以将关节的运动变异性分解为好的运动变异性（运动等效）和坏的运动变异性（非运动等效）。好的变异性不影响COM位置，而坏的变异性则会影响COM位置。29名受试者，包括16名健康年轻人（26.1 +/- 4.5岁）和13名老年人（74.6 +/- 5.6岁），无全身性疾病、神经系统疾病或重度退行性疾病，站在平坦平台上，接受非预期的向后平移。在平衡恢复过程中，老年人的关节活动量与年轻人相似，但胸腰椎关节除外。然而，UCM分析表明，老年人改变了他们的关节协调模式，以控制COM，并有一个较低的运动等效指数增加非运动等效变异性（坏的变异性）。我们的结论是，正常的老年人失去了补偿策略，灵活控制多个关节时，稳定COM后收到的平衡扰动。
Falls represent a significant health risk in the elderly and often result in injuries that require medical attention. Reduced ability to control motion of the whole-body center of mass (COM) has been shown to identify elderly people at risk of falling. To explore effective preventive strategies and interventions, we studied adult age-related differences in multijoint coordination to control the COM during balance recovery. We used the uncontrolled manifold (UCM) analysis, which can decompose movement variability of joints into good movement variability (motor equivalent) and bad movement variability (nonmotor equivalent). The good variability does not affect the COM position, while the bad variability does. Twenty-nine subjects, including 16 healthy young (26.1 +/- 4.5 year) and 13 older (74.6 +/- 5.6 year) adults without systematic disease, neurological disease, or a severe degenerative condition stood on a flat platform, and received an unexpected backward translation. The older adults had similar amounts of joint movement as the young adults during balance recovery except for the thoracic-lumbar joint. However, the UCM analysis showed that the older adults changed their joint coordination pattern to control the COM and had a lower motor equivalent index with increased nonmotor equivalent variability (bad variability). We conclude that normal aging adults lose the compensatory strategy of flexibly controlling multiple joints when stabilizing the COM after receiving a balance perturbation.