Effects of chiropractic spinal manipulation on laser-evoked pain and brain activity.
J Physiol Sci
; 71(1): 20, 2021 Jun 24.
Article
en En
| MEDLINE
| ID: mdl-34167458
ABSTRACT
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.
Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Dolor
/
Encéfalo
/
Manipulación Espinal
Tipo de estudio:
Clinical_trials
Límite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
J Physiol Sci
Asunto de la revista:
FISIOLOGIA
/
TRAUMATOLOGIA
Año:
2021
Tipo del documento:
Article
País de afiliación:
Canadá