Human masticatory muscle activity and jaw position under experimental stress

Chih Mong Tasi, Sun Long Chou, Elliot N. Gale, Willard D. McCall

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The purpose of the present study was to determine whether stress induced a consistent pattern of increased electromyographic (EMG) activity in different masticatory muscles, and whether stress produced changes in jaw position. Thirty-five dental students at Taipei Medical College volunteered for this study. Mental arithmetic was used to create a stress condition and relaxation instruction was used to help relax the subjects. Subjects were asked to evaluate the stress they felt under each experimental condition with a visual analogue scale (VAS). Surface electrodes were used to monitor the EMG activities of the right masseter, right posterior temporalis and suprahyoid muscles. A kinesiograph was used to observe the jaw position. Data collected before mental arithmetic or relaxation monitored the baseline level. The VAS means were significantly increased during the stress condition and significantly decreased following relaxation, compared with the baseline. There was also a significant increase in EMG activity of all three muscles during mental arithmetic compared with baseline; different patterns of increased EMG activity were noticed in the three muscles under a continuous stress condition. Under stress, the incidence of tooth contact at intercuspal position was also increased.

Original languageEnglish
Pages (from-to)44-51
Number of pages8
JournalJournal of Oral Rehabilitation
Volume29
Issue number1
DOIs
Publication statusPublished - Jan 2002

Fingerprint

Masticatory Muscles
Jaw
Visual Analog Scale
Muscles
Dental Students
Tooth
Electrodes
Incidence

Keywords

  • Electromyogram
  • Jaw position
  • Masticatory muscles
  • Mental arithmetic
  • Stress

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Human masticatory muscle activity and jaw position under experimental stress. / Tasi, Chih Mong; Chou, Sun Long; Gale, Elliot N.; McCall, Willard D.

In: Journal of Oral Rehabilitation, Vol. 29, No. 1, 01.2002, p. 44-51.

Research output: Contribution to journalArticle

Tasi, Chih Mong ; Chou, Sun Long ; Gale, Elliot N. ; McCall, Willard D. / Human masticatory muscle activity and jaw position under experimental stress. In: Journal of Oral Rehabilitation. 2002 ; Vol. 29, No. 1. pp. 44-51.
@article{b7de8a587ccc44f0988e7a0e21791f05,
title = "Human masticatory muscle activity and jaw position under experimental stress",
abstract = "The purpose of the present study was to determine whether stress induced a consistent pattern of increased electromyographic (EMG) activity in different masticatory muscles, and whether stress produced changes in jaw position. Thirty-five dental students at Taipei Medical College volunteered for this study. Mental arithmetic was used to create a stress condition and relaxation instruction was used to help relax the subjects. Subjects were asked to evaluate the stress they felt under each experimental condition with a visual analogue scale (VAS). Surface electrodes were used to monitor the EMG activities of the right masseter, right posterior temporalis and suprahyoid muscles. A kinesiograph was used to observe the jaw position. Data collected before mental arithmetic or relaxation monitored the baseline level. The VAS means were significantly increased during the stress condition and significantly decreased following relaxation, compared with the baseline. There was also a significant increase in EMG activity of all three muscles during mental arithmetic compared with baseline; different patterns of increased EMG activity were noticed in the three muscles under a continuous stress condition. Under stress, the incidence of tooth contact at intercuspal position was also increased.",
keywords = "Electromyogram, Jaw position, Masticatory muscles, Mental arithmetic, Stress",
author = "Tasi, {Chih Mong} and Chou, {Sun Long} and Gale, {Elliot N.} and McCall, {Willard D.}",
year = "2002",
month = "1",
doi = "10.1046/j.1365-2842.2002.00810.x",
language = "English",
volume = "29",
pages = "44--51",
journal = "Journal of Oral Rehabilitation",
issn = "0305-182X",
publisher = "Wiley-Blackwell",
number = "1",

}

TY - JOUR

T1 - Human masticatory muscle activity and jaw position under experimental stress

AU - Tasi, Chih Mong

AU - Chou, Sun Long

AU - Gale, Elliot N.

AU - McCall, Willard D.

PY - 2002/1

Y1 - 2002/1

N2 - The purpose of the present study was to determine whether stress induced a consistent pattern of increased electromyographic (EMG) activity in different masticatory muscles, and whether stress produced changes in jaw position. Thirty-five dental students at Taipei Medical College volunteered for this study. Mental arithmetic was used to create a stress condition and relaxation instruction was used to help relax the subjects. Subjects were asked to evaluate the stress they felt under each experimental condition with a visual analogue scale (VAS). Surface electrodes were used to monitor the EMG activities of the right masseter, right posterior temporalis and suprahyoid muscles. A kinesiograph was used to observe the jaw position. Data collected before mental arithmetic or relaxation monitored the baseline level. The VAS means were significantly increased during the stress condition and significantly decreased following relaxation, compared with the baseline. There was also a significant increase in EMG activity of all three muscles during mental arithmetic compared with baseline; different patterns of increased EMG activity were noticed in the three muscles under a continuous stress condition. Under stress, the incidence of tooth contact at intercuspal position was also increased.

AB - The purpose of the present study was to determine whether stress induced a consistent pattern of increased electromyographic (EMG) activity in different masticatory muscles, and whether stress produced changes in jaw position. Thirty-five dental students at Taipei Medical College volunteered for this study. Mental arithmetic was used to create a stress condition and relaxation instruction was used to help relax the subjects. Subjects were asked to evaluate the stress they felt under each experimental condition with a visual analogue scale (VAS). Surface electrodes were used to monitor the EMG activities of the right masseter, right posterior temporalis and suprahyoid muscles. A kinesiograph was used to observe the jaw position. Data collected before mental arithmetic or relaxation monitored the baseline level. The VAS means were significantly increased during the stress condition and significantly decreased following relaxation, compared with the baseline. There was also a significant increase in EMG activity of all three muscles during mental arithmetic compared with baseline; different patterns of increased EMG activity were noticed in the three muscles under a continuous stress condition. Under stress, the incidence of tooth contact at intercuspal position was also increased.

KW - Electromyogram

KW - Jaw position

KW - Masticatory muscles

KW - Mental arithmetic

KW - Stress

UR - http://www.scopus.com/inward/record.url?scp=0036358609&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0036358609&partnerID=8YFLogxK

U2 - 10.1046/j.1365-2842.2002.00810.x

DO - 10.1046/j.1365-2842.2002.00810.x

M3 - Article

C2 - 11844031

AN - SCOPUS:0036358609

VL - 29

SP - 44

EP - 51

JO - Journal of Oral Rehabilitation

JF - Journal of Oral Rehabilitation

SN - 0305-182X

IS - 1

ER -