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Abstract
Double discharges, or doublets, following the direct M response after peripheral nerve
stimulation had a distal origin on the axon and were accompanied by a back-response.
This antidromic wave was demonstrated by collision technique or by its occasional
recurrent F wave.
Double discharges (DD) with a long interval between the two components had their origin
in one subunit and were transmitted to another by motor axon reflex.
Increase of the post-doublet interval (PDI) duration during EMG was best explained
by invasion of the alpha cell by the back-response and the resetting of a new cycle.
This invasion was sometimes followed by a recurrent F wave: a shorter PDI resulted.
Normal PDI were probably due to blocking of the back-response at the myelinated-non-myelinated
junction, without alpha cell invasion: weak or absent Renshaw inhibitory effect on
the alpha cell concerned seemed to play a role.
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Article info
Publication history
Accepted:
February 22,
1980
Received:
November 26,
1979
Identification
Copyright
© 1980 Published by Elsevier Inc.