Journal of Applied Physiology Journal of Applied Physiology
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J Appl Physiol 93: 127-133, 2002. First published March 22, 2002; doi:10.1152/japplphysiol.00007.2001
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Vol. 93, Issue 1, 127-133, July 2002

Down training of the elderly soleus H reflex with the use of a spinally induced balance perturbation

Richard G. Mynark1 and David M. Koceja2

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


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Training-induced adaptive plasticity in human somatosensory reflex pathways
J Appl Physiol, December 1, 2006; 101(6): 1783 - 1794.
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