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- C Weidner, M Schmelz, R Schmidt, B Hansson, H O Handwerker, and H E Torebjörk.
- Department of Physiology and Experimental Pathophysiology, University of Erlangen/Nürnberg, D-91054 Erlangen, Germany.
- J. Neurosci. 1999 Nov 15;19(22):10184-90.
AbstractMicroneurography was used in healthy human subjects to record action potentials from unmyelinated nerve fibers (C units) in cutaneous fascicles of the peroneal nerve. Activity-dependent slowing (n = 96) and transcutaneous electrical thresholds (n = 67) were determined. Eight units were sympathetic efferents according to their responses to sympathetic reflex provocations. Mechano-heat-responsive C units (CMH) (n = 56) had thresholds to von Frey hair stimulation 35 mA for CH and CM(i)H(i) units. Activity-dependent slowing was much more pronounced in mechano-insensitive than in mechano-responsive units, without overlap. Sympathetic efferent C units showed intermediate slowing, significantly different from CMH, and completely separate from CH and CM(i)H(i) units. The activity-dependent slowing of conduction provides evidence for different membrane attributes of different classes of C fibers in humans.
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