Intramuscular pH modulates glutamate-evoked masseter muscle pain magnitude in humans

H. Sato, E. E. Castrillon, B. E. Cairns, K. H. Bendixen, K. Wang, Taneaki Nakagawa, K. Wajima, P. Svensson

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Background This study was conducted to determine whether glutamate-evoked jaw muscle pain is modulated by the acidity and temperature of the solution injected. Methods Thirty two participants participated and received injections of high-temperature acidic (HT-A) glutamate (pH 4.8, 48 C), high-temperature neutral (HT-N) glutamate (pH 7.0, 48 C) and neutral temperature neutral (NT-N) glutamate (pH 7.0, 38 C) solutions (0.5 mL) into the masseter muscle. Pain intensity was assessed with an electronic visual analogue scale (eVAS). Numerical rating scale (NRS) scores of unpleasantness and temperature perception, pain-drawing areas, mechanical sensitivity and pressure pain thresholds (PPT) were also measured. Participants filled out the McGill Pain Questionnaire (MPQ). One or two way ANOVAs were used for data analyses. Results Injection of HT-A glutamate solutions significantly increased the area under the VAS-time curve compared with injection of HT-N glutamate and NT-N glutamate solution (p <0.040). The duration of glutamate-evoked pain was significantly longer when HT-A glutamate was injected than when NT-N glutamate was injected (p <0.017). No significant effects of acidity were detected on pain drawings, NRS unpleasantness and heat perception, but there was a significant effect of acidity on MPQ scores and mechanical sensitivity. Conclusion Acidity and temperature modulate glutamate-evoked jaw muscle pain suggesting an interaction between acid sensing and glutamate receptors which could be of importance for understanding clinical muscle pain conditions.

Original languageEnglish
Pages (from-to)106-115
Number of pages10
JournalEuropean Journal of Pain (United Kingdom)
Volume20
Issue number1
DOIs
Publication statusPublished - 2016 Jan 1

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Masseter Muscle
Myalgia
Glutamic Acid
Temperature
Pain Measurement
Jaw
Pain
Injections
Pain Perception
Pain Threshold
Glutamate Receptors
Visual Analog Scale
Analysis of Variance
Hot Temperature

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine

Cite this

Sato, H., Castrillon, E. E., Cairns, B. E., Bendixen, K. H., Wang, K., Nakagawa, T., ... Svensson, P. (2016). Intramuscular pH modulates glutamate-evoked masseter muscle pain magnitude in humans. European Journal of Pain (United Kingdom), 20(1), 106-115. https://doi.org/10.1002/ejp.697

Intramuscular pH modulates glutamate-evoked masseter muscle pain magnitude in humans. / Sato, H.; Castrillon, E. E.; Cairns, B. E.; Bendixen, K. H.; Wang, K.; Nakagawa, Taneaki; Wajima, K.; Svensson, P.

In: European Journal of Pain (United Kingdom), Vol. 20, No. 1, 01.01.2016, p. 106-115.

Research output: Contribution to journalArticle

Sato, H, Castrillon, EE, Cairns, BE, Bendixen, KH, Wang, K, Nakagawa, T, Wajima, K & Svensson, P 2016, 'Intramuscular pH modulates glutamate-evoked masseter muscle pain magnitude in humans', European Journal of Pain (United Kingdom), vol. 20, no. 1, pp. 106-115. https://doi.org/10.1002/ejp.697
Sato, H. ; Castrillon, E. E. ; Cairns, B. E. ; Bendixen, K. H. ; Wang, K. ; Nakagawa, Taneaki ; Wajima, K. ; Svensson, P. / Intramuscular pH modulates glutamate-evoked masseter muscle pain magnitude in humans. In: European Journal of Pain (United Kingdom). 2016 ; Vol. 20, No. 1. pp. 106-115.
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abstract = "Background This study was conducted to determine whether glutamate-evoked jaw muscle pain is modulated by the acidity and temperature of the solution injected. Methods Thirty two participants participated and received injections of high-temperature acidic (HT-A) glutamate (pH 4.8, 48 C), high-temperature neutral (HT-N) glutamate (pH 7.0, 48 C) and neutral temperature neutral (NT-N) glutamate (pH 7.0, 38 C) solutions (0.5 mL) into the masseter muscle. Pain intensity was assessed with an electronic visual analogue scale (eVAS). Numerical rating scale (NRS) scores of unpleasantness and temperature perception, pain-drawing areas, mechanical sensitivity and pressure pain thresholds (PPT) were also measured. Participants filled out the McGill Pain Questionnaire (MPQ). One or two way ANOVAs were used for data analyses. Results Injection of HT-A glutamate solutions significantly increased the area under the VAS-time curve compared with injection of HT-N glutamate and NT-N glutamate solution (p <0.040). The duration of glutamate-evoked pain was significantly longer when HT-A glutamate was injected than when NT-N glutamate was injected (p <0.017). No significant effects of acidity were detected on pain drawings, NRS unpleasantness and heat perception, but there was a significant effect of acidity on MPQ scores and mechanical sensitivity. Conclusion Acidity and temperature modulate glutamate-evoked jaw muscle pain suggesting an interaction between acid sensing and glutamate receptors which could be of importance for understanding clinical muscle pain conditions.",
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N2 - Background This study was conducted to determine whether glutamate-evoked jaw muscle pain is modulated by the acidity and temperature of the solution injected. Methods Thirty two participants participated and received injections of high-temperature acidic (HT-A) glutamate (pH 4.8, 48 C), high-temperature neutral (HT-N) glutamate (pH 7.0, 48 C) and neutral temperature neutral (NT-N) glutamate (pH 7.0, 38 C) solutions (0.5 mL) into the masseter muscle. Pain intensity was assessed with an electronic visual analogue scale (eVAS). Numerical rating scale (NRS) scores of unpleasantness and temperature perception, pain-drawing areas, mechanical sensitivity and pressure pain thresholds (PPT) were also measured. Participants filled out the McGill Pain Questionnaire (MPQ). One or two way ANOVAs were used for data analyses. Results Injection of HT-A glutamate solutions significantly increased the area under the VAS-time curve compared with injection of HT-N glutamate and NT-N glutamate solution (p <0.040). The duration of glutamate-evoked pain was significantly longer when HT-A glutamate was injected than when NT-N glutamate was injected (p <0.017). No significant effects of acidity were detected on pain drawings, NRS unpleasantness and heat perception, but there was a significant effect of acidity on MPQ scores and mechanical sensitivity. Conclusion Acidity and temperature modulate glutamate-evoked jaw muscle pain suggesting an interaction between acid sensing and glutamate receptors which could be of importance for understanding clinical muscle pain conditions.

AB - Background This study was conducted to determine whether glutamate-evoked jaw muscle pain is modulated by the acidity and temperature of the solution injected. Methods Thirty two participants participated and received injections of high-temperature acidic (HT-A) glutamate (pH 4.8, 48 C), high-temperature neutral (HT-N) glutamate (pH 7.0, 48 C) and neutral temperature neutral (NT-N) glutamate (pH 7.0, 38 C) solutions (0.5 mL) into the masseter muscle. Pain intensity was assessed with an electronic visual analogue scale (eVAS). Numerical rating scale (NRS) scores of unpleasantness and temperature perception, pain-drawing areas, mechanical sensitivity and pressure pain thresholds (PPT) were also measured. Participants filled out the McGill Pain Questionnaire (MPQ). One or two way ANOVAs were used for data analyses. Results Injection of HT-A glutamate solutions significantly increased the area under the VAS-time curve compared with injection of HT-N glutamate and NT-N glutamate solution (p <0.040). The duration of glutamate-evoked pain was significantly longer when HT-A glutamate was injected than when NT-N glutamate was injected (p <0.017). No significant effects of acidity were detected on pain drawings, NRS unpleasantness and heat perception, but there was a significant effect of acidity on MPQ scores and mechanical sensitivity. Conclusion Acidity and temperature modulate glutamate-evoked jaw muscle pain suggesting an interaction between acid sensing and glutamate receptors which could be of importance for understanding clinical muscle pain conditions.

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