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H-Reflex Modulation During Walking in Spastic Paretic Subjects

Published online by Cambridge University Press:  18 September 2015

J.F. Yang ,
J. Fung ,
M. Edamura ,
R. Blunt ,
R.B. Stein  and
H. Barbeau
J.F. Yang*
Affiliation:
Division of Neuroscience, University of Alberta, Edmonton Department of Physical Therapy, University of Alberta, Edmonton
J. Fung
Affiliation:
School of Physical Occupational Therapy, McGill University, Montreal
M. Edamura
Affiliation:
Department of Physiology, University of Alberta, Edmonton
R. Blunt
Affiliation:
Department of Physiology, University of Alberta, Edmonton School of Physical Occupational Therapy, McGill University, Montreal
R.B. Stein
Affiliation:
Division of Neuroscience, University of Alberta, Edmonton Department of Physiology, University of Alberta, Edmonton
H. Barbeau
Affiliation:
School of Physical Occupational Therapy, McGill University, Montreal
*
Division of Neuroscience, 513 Heritage Medical Research Ctr., University of Alberta, Edmonton, Alberta, Canada T6G 2S2
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Abstract:

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Hoffmann (H) reflexes were elicited from the soleus muscle during treadmill walking in 21 spastic paretic patients. The soleus and tibialis anterior muscles were reciprocally activated during walking in most patients, much like that observed in healthy individuals. The pattern of H-reflex modulation varied considerably between patients, from being relatively normal in some patients to a complete absence of modulation in others. The most common pattern observed was a lack of H-reflex modulation through the stance phase and slight depression of the reflex in the swing phase, considerably less modulation than that of normal subjects under comparable walking conditions. The high reflex amplitudes during periods of the step cycle such as early stance seems to be related to the stretch-induced large electromyogram bursts in the soleus in some subjects. The abnormally active reflexes appear to contribute to the clonus encountered during walking in these patients. In three patients who were able to walk for extended periods, the effect of stimulus intensity was examined. Two of these patients showed a greater degree of reflex modulation at lower stimulus intensities, suggesting that the lack of modulation observed at higher stimulus intensities is a result of saturation of the reflex loop. In six other patients, however, no reflex modulation could be demonstrated even at very low stimulus intensities.

Type
Articles
Information
Canadian Journal of Neurological Sciences , Volume 18 , Issue 4 , November 1991 , pp. 443 - 452
Copyright
Copyright © Canadian Neurological Sciences Federation 1991

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