Effects of chiropractic spinal manipulation on laser-evoked pain and brain activity

Provencher, B., Northon, S., Gevers Montoro, C., O’Shaughnessy, J. et Piché, M. (2021). Effects of chiropractic spinal manipulation on laser-evoked pain and brain activity. Journal of Physiological Sciences, 71 (1). ISSN 1880-6546 DOI 10.1186/s12576-021-00804-2

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Résumé

The aim of this study was to examine the mechanisms underlying hypoalgesia induced by spinal manipulation (SM). Eighty-two healthy volunteers were assigned to one of the four intervention groups: no intervention, SM at T4 (homosegmental to pain), SM at T8 (heterosegmental to pain) or light mechanical stimulus at T4 (placebo). Eighty laser stimuli were applied on back skin at T4 to evoke pain and brain activity related to Aδ- and C-fibers activation. The intervention was performed after 40 stimuli. Laser pain was decreased by SM at T4 (p = 0.028) but not T8 (p = 0.13), compared with placebo. However, brain activity related to Aδ-fibers activation was not significantly modulated (all p > 0.05), while C-fiber activity could not be measured reliably. This indicates that SM produces segmental hypoalgesia through inhibition of nociceptive processes that are independent of Aδ fibers. It remains to be clarified whether the effect is mediated by the inhibition of C-fiber activity. [Figure not available: see fulltext.]. © 2021, The Author(s).

Type de document:	Article
Mots-clés libres:	electroencephalography hypoalgesia nociceptive fibers spinal manipulation
Date de dépôt:	09 déc. 2021 20:35
Dernière modification:	09 déc. 2021 20:35
Version du document déposé:	Version officielle de l'éditeur
URI:	https://depot-e.uqtr.ca/id/eprint/9828

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