Recovery of excitability of cutaneous afferents in the median and sural nerves following activity.

Abstract:

:In acquired polyneuropathies, symptoms and signs are typically distal and symmetrical, more prominent in the lower limbs than the upper limbs. This study was undertaken to measure the extent of the decrease in excitability produced by single impulses and by impulse trains in cutaneous afferents in the median and sural nerves, and to compare the resulting changes in excitability of these afferents. Threshold tracking was used in 10 healthy subjects to measure the changes in threshold for a compound sensory action potential of 50% maximum produced by conditioning stimuli. Following a single supramaximal conditioning stimulus, the threshold changes occurring during the refractory and supernormal periods were identical for the two nerves, but there was a greater increase in threshold during the late subnormal period for median afferents. Following a train of 10 supramaximal conditioning stimuli, threshold increased by approximately 40% for median afferents and by approximately 20% for sural afferents. These differences are consistent with differences in a slow K(+) conductance. It is suggested that the hypo-excitability produced by brief trains of impulses may be sufficient to disturb conduction in diseased nerve fibers, and that the lesser expression of slow K(+) conductances on cutaneous afferents in the sural nerve could render them more sensitive to depolarizing stresses than median afferents. This could be a factor in the ease with which sural afferents become ectopically active in polyneuropathies.

journal_name

Muscle Nerve

journal_title

Muscle & nerve

authors

Lin CS,Mogyoros I,Burke D

doi

10.1002/(sici)1097-4598(200005)23:5<763::aid-mus14

subject

Has Abstract

pub_date

2000-05-01 00:00:00

pages

763-70

issue

5

eissn

0148-639X

issn

1097-4598

pii

10.1002/(SICI)1097-4598(200005)23:5<763::AID-MUS14

journal_volume

23

pub_type

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