The effect of aging on anticipatory postural control.
The effect of aging on anticipatory postural control.
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DOI：
10.1007/s00221-014-3822-3
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发表时间：
2014-04
影响因子：
2
通讯作者：
Aruin, Alexander S.
中科院分区：
文献类型：
--
作者：
Kanekar, Neeta;Aruin, Alexander S.
本研究的目的是调查青年和老年人之间的预期（APAs）姿势调整的差异及其对随后的姿势控制的影响。10名健康的老年人和13名健康的年轻人暴露于可预测的外部扰动使用的冲击范式。在姿势控制的预期和补偿（CPAs）阶段，记录和分析躯干和腿部肌肉的EMG活动、压力中心（COP）和前-后（AP）方向的质心（COM）位移。与年轻人相比，老年人的预期肌肉活动延迟，补偿性肌肉反应更大。此外，尽管这种较大的反应性反应，老年人仍然更不稳定，表现出较大的COP和COM峰值位移扰动后，比年轻人暴露于类似的姿势紊乱。尽管如此，尽管老年人的APA受损，但预期招募肌肉的能力在很大程度上得到了保留，然而，由于其较小的幅度和延迟的发作，它们在降低CPA幅度方面的有效性可能较小。这项研究的结果有助于调查改善因衰老或神经系统疾病而导致平衡障碍的人的预期姿势控制的方法。
The aim of the study was to investigate the differences in anticipatory (APAs) postural adjustments between young and older adults and its effect on subsequent control of posture. Ten healthy older adults and thirteen healthy young adults were exposed to predictable external perturbations using the pendulum-impact paradigm. EMG activity of the trunk and leg muscles, the center of pressure (COP), and center of mass (COM) displacements in the anterior-posterior (AP) direction were recorded and analyzed during the anticipatory and compensatory (CPAs) phases of postural control. The effect of aging was seen as delayed anticipatory muscle activity and larger compensatory muscle responses in older adults as compared to young adults. Moreover, in spite of such larger reactive responses, older adults were still more unstable, exhibiting larger COP and COM peak displacements after the perturbation than young adults when exposed to similar postural disturbances. Nonetheless, while APAs are impaired in older adults, the ability to recruit muscles anticipatorily is largely preserved, however, due to their smaller magnitudes and delayed onsets, it is likely that their effectiveness in reducing the magnitude of CPAs is smaller. The outcome of the study lends support towards investigating the ways of improving anticipatory postural control in people with balance impairments due to aging or neurological disorders.
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