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1 Motor Control Laboratory, Department of Exercise and Sport Science, University of North Carolina, Chapel Hill, North Carolina 27599; and 2 Motor Control Laboratory, Department of Kinesiology, and Program in Neural Science, Indiana University, Bloomington, Indiana 47405
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.
postural control; reflex modulation; aging
This article has been cited by other articles:
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E. P. Zehr Training-induced adaptive plasticity in human somatosensory reflex pathways J Appl Physiol, December 1, 2006; 101(6): 1783 - 1794. [Abstract] [Full Text] [PDF] |
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