Down training of the elderly soleus H reflex with the use of a spinally induced balance perturbation
Down training of the elderly soleus H reflex with the use of a spinally induced balance perturbation
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DOI：
10.1152/japplphysiol.00007.2001
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发表时间：
2002-07-01
影响因子：
3.3
通讯作者：
Koceja, DM
中科院分区：
文献类型：
--
作者：
Mynark, RG;Koceja, DM
本研究的目的是确定老年人中枢神经系统调节脊髓反射输出的能力，从而在功能上减少脊柱引起的平衡紊乱。在本例中，比目鱼H反射被用作扰动源。因此，减少（向下训练）比目鱼H反射是必要的，以抵消这种扰动，并更好地保持姿势控制。除了评估这种扰动对H反射的影响外，还测量了静态姿势稳定性以评估可能的功能影响。10名健康青年受试者（年龄：27.0 +/- 4.6岁）和10名健康老年受试者（年龄：71.4 +/- 5.1岁）参加了本研究。受试者连续2天出现平衡紊乱。在扰动的第1天，年轻人（-20.4%）和老年人（-18.7%）的比目鱼H反射都出现了显著的向下训练。在扰动的第2天，年轻人（-24.6%）和老年人（-21.0%）的比目鱼H反射再次出现显著的向下训练。平衡干扰2天后的静态稳定性分析显示，老年受试者的摇摆面积显著减少10.1%。总之，这项研究表明，与年轻受试者相比，健康的老年受试者对平衡扰动的向下训练比目鱼H反射的能力是一样的。此外，通过平衡训练改善静态稳定性可能进一步证明平衡可以在反射功能下降的受试者中进行再训练和康复。
The purpose of this study was to determine the ability of the elderly central nervous system to modulate spinal reflex output to functionally decrease a spinally induced balance perturbation. In this case, the soleus H reflex was used as the source of perturbation. Therefore, decreasing (down training) of the soleus H reflex was necessary to counteract this perturbation and to better maintain postural control. In addition to assessing the effect of this perturbation on the H reflex, static postural stability was measured to evaluate possible functional effects. Ten healthy young subjects (age: 27.0 +/- 4.6 yr) and 10 healthy elderly subjects (age: 71.4 +/- 5.1 yr) participated in this study. Subjects underwent balance perturbation on 2 consecutive days. On day 1 of perturbation, significant down training of the soleus H reflex was demonstrated in both young (-20.4%) and elderly (-18.7%) subjects. On day 2 of perturbation, significant down training of the soleus H reflex was again demonstrated in both young (-24.6%) and elderly (-21.0%) subjects. Analysis of static stability after the 2 days of balance perturbation revealed a significant 10.1% decrease in the area of sway in elderly subjects. In conclusion, this study demonstrated that healthy, elderly subjects compared with young subjects were equally capable of down training the soleus H reflex in response to a balance perturbation. Furthermore, the improvement in static stability through balance training may provide further evidence that balance can be retrained and rehabilitated in subjects with decreased reflex function.