Journal
NEUROSCIENCE LETTERS
Volume 295, Issue 3, Pages 105-108Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/S0304-3940(00)01604-9
Keywords
H-reflex; M-wave; forearm; pronation; supination
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The effect of the forearm position, prone vs. supine, on the excitability of the H-reflex in flexor carpi radialis (FCR) muscle was tested in nine adult volunteers by comparing the recruitment profiles of the H and M waves. The H-reflex size, normalized to the maximal M response, was lower when the forearm was supine than when it was prone, with an average reduction of about 50% over most of the H-recruitment curve. In three wrist positions, intermediate between prone and supine, the amount of reflex attenuation was related to the prone-supination angle. Control experiments excluded that the changes in the H reflex excitability were due to displacements of the sti mu rating or recording electrodes. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.
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