C-fiber-related brain responses evoked by laser heat pulses applied to the back

Provencher, B. et Piché, M. (2025). C-fiber-related brain responses evoked by laser heat pulses applied to the back. The Journal of Physiological Sciences, 75 (2). Article 100018. ISSN 1880-6546 1880-6562 DOI 10.1016/j.jphyss.2025.100018

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Résumé

Abstract
The aim of the present study was to examine C-fiber-related brain responses evoked by laser heat stimuli applied to the lumbar area, and to determine the stimulation protocol that produces the most reliable responses. Thirty healthy volunteers completed the study. Combinations of different stimuli (single pulses or trains of three pulses) with different pulse durations (7 or 14 ms) were used to compare C-fiber-related brain responses between protocols. The four protocols elicited comparable C-fiber-related brain responses to laser heat pulses. However, pulse trains of 7 ms pulses at 0.67 Hz elicited C-LEPs in the greatest proportion of participants (86.7 %). C-LEPs occurred within a 500 ms to 1500 ms post-stimulus time window, consistent with the perception associated with C-fiber activation. These results provide novel data on C-fiber-related brain responses to painful stimuli and a reliable stimulation protocol for future studies on low back pain.

Type de document:	Article
Mots-clés libres:	c-fibers Lasers Evoked-potentials Back Pain Brain activity
Date de dépôt:	10 déc. 2025 17:17
Dernière modification:	10 déc. 2025 17:17
Version du document déposé:	Version officielle de l'éditeur
URI:	https://depot-e.uqtr.ca/id/eprint/12467

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