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https://hdl.handle.net/2440/50594
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Type: | Journal article |
Title: | Effect of experimental pain on EMG-activity in human jaw-closing muscles in different jaw positions |
Author: | Baad-Hansen, L. Hara, S. Marumo, Y. Miles, T. Svensson, P. |
Citation: | Archives of Oral Biology, 2009; 54(1):32-39 |
Publisher: | Pergamon-Elsevier Science Ltd |
Issue Date: | 2009 |
ISSN: | 0003-9969 1879-1506 |
Statement of Responsibility: | Lene Baad-Hansen, Setsuhiro Hara, Yoshitsugu Marumo, Timothy Miles and Peter Svensson |
Abstract: | We examined the effect of a standardized painful stimulus on the surface EMG-activity of the human jaw-closing muscles at rest and during two levels of jaw opening. Sixteen healthy women participated in two experimental sessions. In randomized order, hypertonic saline (HS: 5.8%) was infused into the left masseter muscle on one occasion, and isotonic saline (IS: 0.9%) on the other. The subjects scored the pain intensity continuously on a 0–10 visual analogue scale (VAS). The subjects were asked to hold the jaw in three different positions (rest, half-maximal, and maximal opening). Before, during, and after infusion, the EMG-activity was recorded from the masseter and temporalis muscles with the jaw in each of the three positions. HS induced significantly higher pain-levels than IS (mean VAS: HS: 5.2 ± 1.3, IS: 0.7 ± 0.2, P < 0.05). At rest, the EMG-activity in most of the jaw muscles increased significantly during both infusions (P < 0.05). At half-maximal opening, the EMG-activity in the infused muscle increased significantly with both HS and IS (P < 0.05). At maximal opening, the EMG-activity during infusion of HS decreased significantly in the right masseter and temporalis (P < 0.05). There was no significant difference in the position of the jaw at rest during infusions. However, the vertical opening distance was significantly decreased during infusion of HS at half-maximal and maximal opening (P < 0.05). Conclusions: It is concluded that experimental pain affects EMG-activity differentially in jaw-closing muscles in different opening positions of the jaw. |
Keywords: | Masseter Muscle Jaw Humans Saline Solution, Hypertonic Isotonic Solutions Pain Measurement Electromyography Motor Activity Adult Female Young Adult |
Description: | Copyright © 2008 Elsevier |
DOI: | 10.1016/j.archoralbio.2008.08.001 |
Published version: | http://dx.doi.org/10.1016/j.archoralbio.2008.08.001 |
Appears in Collections: | Aurora harvest Molecular and Biomedical Science publications |
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