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Published in: The Journal of Headache and Pain 1/2013

Open Access 01-12-2013 | Research article

Headache and mechanical sensitization of human pericranial muscles after repeated intake of monosodium glutamate (MSG)

Authors: Akiko Shimada, Brian E Cairns, Nynne Vad, Kathrine Ulriksen, Anne Marie Lynge Pedersen, Peter Svensson, Lene Baad-Hansen

Published in: The Journal of Headache and Pain | Issue 1/2013

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Abstract

Background

A single intake of monosodium glutamate (MSG) may cause headache and increased muscle sensitivity. We conducted a double-blinded, placebo-controlled, crossover study to examine the effect of repeated MSG intake on spontaneous pain, mechanical sensitivity of masticatory muscles, side effects, and blood pressure.

Methods

Fourteen healthy subjects participated in 5 daily sessions for one week of MSG intake (150 mg/kg) or placebo (24 mg/kg NaCl) (randomized, double-blinded). Spontaneous pain, pressure pain thresholds and tolerance levels for the masseter and temporalis muscles, side effects, and blood pressure were evaluated before and 15, 30, and 50 min after MSG intake. Whole saliva samples were taken before and 30 min after MSG intake to assess glutamate concentrations.

Results

Headache occurred in 8/14 subjects during MSG and 2/14 during placebo (P = 0.041). Salivary glutamate concentrations on Day 5 were elevated significantly (P < 0.05). Pressure pain thresholds in masseter muscle were reduced by MSG on Day 2 and 5 (P < 0.05). Blood pressure was significantly elevated after MSG (P < 0.040).

Conclusion

In conclusion, MSG induced mechanical sensitization in masseter muscle and adverse effects such as headache and short-lasting blood pressure elevation for which tolerance did not develop over 5 days of MSG intake.
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Metadata
Title
Headache and mechanical sensitization of human pericranial muscles after repeated intake of monosodium glutamate (MSG)
Authors
Akiko Shimada
Brian E Cairns
Nynne Vad
Kathrine Ulriksen
Anne Marie Lynge Pedersen
Peter Svensson
Lene Baad-Hansen
Publication date
01-12-2013
Publisher
Springer Milan
Published in
The Journal of Headache and Pain / Issue 1/2013
Print ISSN: 1129-2369
Electronic ISSN: 1129-2377
DOI
https://doi.org/10.1186/1129-2377-14-2

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