Cited by 67Fibromyalgia and Chronic Fatigue Syndrome ResearchPain Mechanisms and TreatmentsPain Management and Placebo Effect

Pain relief through expectation supersedes descending inhibitory deficits in fibromyalgia patients

Goffaux, Philippe, de Souza, Juliana Barcellos, Potvin, Stéphane, Marchand, Serge·2009·Pain

Abstract

In healthy adults, expectations can modulate the activity of inhibitory bulbo-spinal projections, and can even block the analgesic properties of counter-irritation - a phenomenon that triggers descending inhibition. Since descending inhibition is known to be deficient in fibromyalgia (FM) patients, we tested the possibility that expectancy-mediated analgesia would improve, or even kick-start, the deficient inhibitory responses of FM patients. By measuring subjective pain ratings, spinal withdrawal reflexes, and somatosensory evoked potentials (SEP), it was possible to test whether or not expectancy-mediated analgesia involved descending inhibition in FM patients. Here, we show that expectations of analgesia radically change the subjective experience of pain, but do not eliminate evidence of spinal hyperexcitability in FM patients. We found that expectations of analgesia reduce subjective pain ratings and decrease SEP amplitudes, confirming that expectations influence thalamocortical processes. However, even when analgesia was experienced, the spinal activity of FM patients was abnormal, showing heightened reflex responses. This demonstrates that, unlike healthy subjects, the modulation of pain by expectations in FM fails to influence spinal activity. These results indicate that FMs are capable of expectancy-induced analgesia but that, for them, this form of analgesia does not depend on the recruitment of descending inhibitory projections.

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Crossref · 10.1016/j.pain.2009.02.008

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Authors
Goffaux, P., de Souza, J. B., Potvin, S., & Marchand, S.
Affiliations
Université de Sherbrooke (CA)
Venue
Pain
Published
2009-09
Volume
145
Issue
1
Pages
18-23
ISSN
0304-3959 (ISSN-L)
OpenAlex
W2021042430
Cited by
67
References
36
Citations by year
2025: 1 · 2024: 2 · 2023: 1 · 2022: 3 · 2021: 1 · 2020: 1 · 2019: 3 · 2018: 7 · 2017: 7 · 2016: 3 · 2015: 7 · 2014: 3 · 2013: 7 · 2012: 10
FWCI
4.32
Type
journal article
Language
en
Open access
closed
Locations
  • Pain (publishedVersion)
  • PubMed (publishedVersion)
Funders
Canadian Institutes of Health Research
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Fibromyalgia and Chronic Fatigue Syndrome Research
  • Health Sciences › Medicine › Physiology › Pain Mechanisms and Treatments
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Pain Management and Placebo Effect
Keywords
fibromyalgia, descending inhibition, descending pain modulation, spinal hyperexcitability, somatosensory evoked potentials, counter-irritation, pain anticipation
MeSH terms
Afferent Pathways, Analgesics, Electric Stimulation, Electroencephalography, Evoked Potentials, Somatosensory, Female, Fibromyalgia, Humans, Neural Inhibition, Pain, Pain Measurement, Sural Nerve, Pain Threshold, Statistics, Nonparametric, Pain Management

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