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Modification of Motor Output to Compensate for Unanticipated Load Conditions During Rapid Voluntary Movements

Published online by Cambridge University Press:  18 September 2015

R.G. Lee ,
G.E. Lucier ,
B.E. Mustard  and
D.G. White
R.G. Lee*
Affiliation:
Departments of Clinical Neurosciences and Medical Physiology, Faculty of Medicine, University of Calgary
G.E. Lucier
Affiliation:
Departments of Clinical Neurosciences and Medical Physiology, Faculty of Medicine, University of Calgary
B.E. Mustard
Affiliation:
Departments of Clinical Neurosciences and Medical Physiology, Faculty of Medicine, University of Calgary
D.G. White
Affiliation:
Departments of Clinical Neurosciences and Medical Physiology, Faculty of Medicine, University of Calgary
*
Department of Clinical Neurosciences, Foothills Hospital, 1403 29th Street N.W., Calgary, Alberta T2N 2T9
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Abstract:

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Mechanisms responsible for load compensation during fast voluntary movements were investigated in 20 normal subjects trained to carry out rapid wrist flexions against a standard load. When an unanticipated increase in load occurred, there was a compensatory increase in agonist EMG and decrease in antagonist EMG. Unanticipated decreases in load produced reciprocal changes with a decrease in agonist EMG and an increase in antagonist EMG. The latency of these EMG changes was quite short and compatible with a spinal reflex mechanism rather than a long loop response. The results suggest that mechanisms exist at the spinal level to allow rapid modification of motor programs when unanticipated load conditions are encountered on initiation of movement.

Type
Original Articles
Information
Canadian Journal of Neurological Sciences , Volume 13 , Issue 2 , May 1986 , pp. 97 - 102
Copyright
Copyright © Canadian Neurological Sciences Federation 1986

References

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