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Stress-induced analgesia: an evaluation of effects on temporal summation of pain and the role of endogenous opioid mechanisms
INTRODUCTION: Acute stress reduces responses to static evoked pain stimuli (stress-induced analgesia [SIA]). Whether SIA inhibits temporal summation of pain, a dynamic evoked pain measure indexing central sensitization, has been little studied and mechanisms were not evaluated. OBJECTIVES: We tested...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Wolters Kluwer
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8826964/ https://www.ncbi.nlm.nih.gov/pubmed/35155968 http://dx.doi.org/10.1097/PR9.0000000000000987 |
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author | Bruehl, Stephen Morris, Matthew C. al'Absi, Mustafa |
author_facet | Bruehl, Stephen Morris, Matthew C. al'Absi, Mustafa |
author_sort | Bruehl, Stephen |
collection | PubMed |
description | INTRODUCTION: Acute stress reduces responses to static evoked pain stimuli (stress-induced analgesia [SIA]). Whether SIA inhibits temporal summation of pain, a dynamic evoked pain measure indexing central sensitization, has been little studied and mechanisms were not evaluated. OBJECTIVES: We tested whether acute laboratory stressors reduce temporal summation and whether endogenous opioid (EO) mechanisms contributed. METHODS: Participants were 72 healthy individuals who attended 2 laboratory sessions, receiving either oral naltrexone (50 mg; opioid antagonist) or placebo (randomized, counterbalanced order). In each session, participants underwent a temporal summation protocol with evoked heat pain stimuli, once after extended rest and once after experiencing 2 acute stressors (public speaking and mental arithmetic challenge). Reduced temporal summation in the stress/pain relative to rest/pain condition indexed SIA. RESULTS: Analyses in the placebo condition indicated significant SIA on initial pain ratings but not temporal summation slope (index of central sensitization). This SIA effect was moderated by stress reactivity, with SIA only observed in high stress responders. Analyses comparing SIA across the drug conditions did not reveal any evidence of stress-related EO inhibition of temporal summation outcomes. Moderation analyses revealed that high, but not low, stress responders exhibited paradoxical analgesic effects of naltrexone on initial pain ratings but not temporal summation slopes. Independent of stress effects, significant EO inhibition of temporal summation slopes was observed, but only in females. CONCLUSIONS: Results suggest that acute stress may reduce initial ratings in temporal summation protocols via nonopioid mechanisms but does not alter the temporal summation slope commonly used to index central sensitization. |
format | Online Article Text |
id | pubmed-8826964 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | Wolters Kluwer |
record_format | MEDLINE/PubMed |
spelling | pubmed-88269642022-02-10 Stress-induced analgesia: an evaluation of effects on temporal summation of pain and the role of endogenous opioid mechanisms Bruehl, Stephen Morris, Matthew C. al'Absi, Mustafa Pain Rep General Section INTRODUCTION: Acute stress reduces responses to static evoked pain stimuli (stress-induced analgesia [SIA]). Whether SIA inhibits temporal summation of pain, a dynamic evoked pain measure indexing central sensitization, has been little studied and mechanisms were not evaluated. OBJECTIVES: We tested whether acute laboratory stressors reduce temporal summation and whether endogenous opioid (EO) mechanisms contributed. METHODS: Participants were 72 healthy individuals who attended 2 laboratory sessions, receiving either oral naltrexone (50 mg; opioid antagonist) or placebo (randomized, counterbalanced order). In each session, participants underwent a temporal summation protocol with evoked heat pain stimuli, once after extended rest and once after experiencing 2 acute stressors (public speaking and mental arithmetic challenge). Reduced temporal summation in the stress/pain relative to rest/pain condition indexed SIA. RESULTS: Analyses in the placebo condition indicated significant SIA on initial pain ratings but not temporal summation slope (index of central sensitization). This SIA effect was moderated by stress reactivity, with SIA only observed in high stress responders. Analyses comparing SIA across the drug conditions did not reveal any evidence of stress-related EO inhibition of temporal summation outcomes. Moderation analyses revealed that high, but not low, stress responders exhibited paradoxical analgesic effects of naltrexone on initial pain ratings but not temporal summation slopes. Independent of stress effects, significant EO inhibition of temporal summation slopes was observed, but only in females. CONCLUSIONS: Results suggest that acute stress may reduce initial ratings in temporal summation protocols via nonopioid mechanisms but does not alter the temporal summation slope commonly used to index central sensitization. Wolters Kluwer 2022-02-08 /pmc/articles/PMC8826964/ /pubmed/35155968 http://dx.doi.org/10.1097/PR9.0000000000000987 Text en Copyright © 2022 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of The International Association for the Study of Pain. https://creativecommons.org/licenses/by-nd/4.0/This is an open access article distributed under the Creative Commons Attribution-NoDerivatives License 4.0 (CC BY-ND) (https://creativecommons.org/licenses/by-nd/4.0/) which allows for redistribution, commercial and noncommercial, as long as it is passed along unchanged and in whole, with credit to the author. |
spellingShingle | General Section Bruehl, Stephen Morris, Matthew C. al'Absi, Mustafa Stress-induced analgesia: an evaluation of effects on temporal summation of pain and the role of endogenous opioid mechanisms |
title | Stress-induced analgesia: an evaluation of effects on temporal summation of pain and the role of endogenous opioid mechanisms |
title_full | Stress-induced analgesia: an evaluation of effects on temporal summation of pain and the role of endogenous opioid mechanisms |
title_fullStr | Stress-induced analgesia: an evaluation of effects on temporal summation of pain and the role of endogenous opioid mechanisms |
title_full_unstemmed | Stress-induced analgesia: an evaluation of effects on temporal summation of pain and the role of endogenous opioid mechanisms |
title_short | Stress-induced analgesia: an evaluation of effects on temporal summation of pain and the role of endogenous opioid mechanisms |
title_sort | stress-induced analgesia: an evaluation of effects on temporal summation of pain and the role of endogenous opioid mechanisms |
topic | General Section |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8826964/ https://www.ncbi.nlm.nih.gov/pubmed/35155968 http://dx.doi.org/10.1097/PR9.0000000000000987 |
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