Effect of experimental pain on EMG-activity in human jaw-closing muscles in different jaw positions

Hara, Setsuhiro; Marumo, Yoshitsugu; Miles, Timothy S.; Svensson, Peter

doi:10.1016/j.archoralbio.2008.08.001

Cited by 12 publications

(9 citation statements)

References 36 publications

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“…Cautious conclusions can be drawn through comparisons of the data of the present study with previous studies identifying significant reductions in the opening amplitude in open/close jaw movements in response to masseter muscle pain induced by hypertonic saline (11,21,47) or glutamate or capsaicin injections (48). The present grouped data analysis shows that noxious anterior temporalis stimulation does not affect open/close or chewing jaw movements and suggests that pain-induced motor effects on jaw movement may be different with noxious stimulation of different jaw muscles.…”

Section: Discussionmentioning

confidence: 54%

Effect of experimental anterior temporalis muscle pain on jaw movements

Amhamed

Whittle

Maulina

et al. 2016

J of Oral Rehabilitation

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To test the hypotheses that experimental noxious stimulation of the anterior temporalis muscle results in significant decreases in jaw movement amplitude and velocity, and there are significant correlations between scores of mood or pain-related cognitions and amplitude and velocity. The jaw movements of 14 asymptomatic participants were recorded during standardised open/close jaw movements and free and standardised chewing tasks. Tonic infusion of hypertonic saline into the right anterior temporalis muscle maintained pain intensity between 40 and 60 mm on a 100-mm visual analogue scale. Tasks were performed in a single session in the following sequence: baseline condition, test 1 condition (during hypertonic or isotonic saline infusion), test 2 condition (during saline infusion) (10-min rest between conditions). Participants completed the Depression, Anxiety and Stress Scale (DASS-21) and the Pain Catastrophizing Scale (PCS). Amplitude and velocity of opening and closing were compared between conditions with a repeated-measures analysis of variance (anova), and Spearman's rank correlation coefficient explored correlations; statistical significance: P < 0·05. For any of the three tasks, there were no significant differences in kinematic variables between any condition and no significant correlations between DASS-21 or PCS scores and kinematic variables during hypertonic saline infusion. The absence of a significant reduction in velocity or amplitude of open/close or chewing jaw movements during experimental temporalis muscle pain is not consistent with the Pain Adaptation Model proposing decreases in kinematic measures in pain. The lack of significant correlations between psychological variables and measures of jaw movement may reflect the low scores reported by our study sample.

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Section: Discussionmentioning

confidence: 54%

Effect of experimental anterior temporalis muscle pain on jaw movements

Amhamed

Whittle

Maulina

et al. 2016

J of Oral Rehabilitation

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“…Each subject sat in an upright and natural position on a comfortable chair with the back supported, although without head support. In each session, the infusion of either HS or IS was given into the posterior part of the left masseter muscle (MAL) through a disposable, 27‐gauge, stainless‐steel needle inserted approximately 2 cm from the EMG recording sites . Placement of the needle deep in MAL was secured by bony contact, followed by about 2‐mm retractions.…”

Section: Methodsmentioning

confidence: 99%

“…The experimental set‐up of the EMG recordings has been described in details in a previous paper . The EMG activity was recorded before HS or IS infusion, 120–720 s after start of infusion and 15 min after any pain evoked by the infusion had ceased.…”

Section: Methodsmentioning

confidence: 99%

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Effect of experimental jaw muscle pain on EMG activity and bite force distribution at different level of clenching

Shimada

Hara

Svensson

2013

J of Oral Rehabilitation

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Bite force at different levels of clenching and the corresponding electromyographic (EMG) activity in jaw-closing muscles were recorded in 16 healthy women before, during and after painful stimulation of the left masseter muscle. Experimental pain was induced by infusion of 5·8% hypertonic saline (HS), and 0·9% isotonic saline (IS) was infused as a control. EMG activity was recorded bilaterally from the masseter and temporalis muscles, and static bite force was assessed by pressure-sensitive films (Dental Pre-scale) at 5, 50 and 100% of maximal voluntary contraction (MVC) during each session. Visual feedback was applied by showing EMG activity to help the subject perform clenching at 5, 50 and 100% MVC, respectively. EMG activity at 100% MVC in left and right masseter decreased significantly during painful HS infusion (1·7-44·6%; P < 0·05). EMG activity at 5% and 50% MVC was decreased during HS infusion in the painful masseter muscle (4·8-18·6%; P < 0·05); however, EMG activity in the other muscles increased significantly (18·5-128·3%; P < 0·05). There was a significant increase in bite force in the molar regions at 50% MVC during HS infusion and in the post-infusion condition (P < 0·05). However, there were no significant differences in the distribution of forces at 100% MVC. In conclusion, experimental pain in the masseter muscle has an inhibitory effect on jaw muscle activity at maximal voluntary contraction, and compensatory mechanisms may influence the recruitment pattern at submaximal efforts.

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“…were performed [6-9]. These studies showed a strong influence of the pain jaw muscles on the jaw movement patterns.…”

Section: Introductionmentioning

confidence: 99%

Analyzing surface EMG signals to determine relationship between jaw imbalance and arm strength loss

et al. 2012

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BackgroundThis study investigated the relationship between dental occlusion and arm strength; in particular, the imbalance in the jaw can cause loss in arm strength phenomenon. One of the goals of this study was to record the maximum forces that the subjects can resist against the pull-down force on their hands while biting a spacer of adjustable height on the right or left side of the jaw. Then EMG measurement was used to determine the EMG-Force relationship of the jaw, neck and arms muscles. This gave us useful insights on the arms strength loss due to the biomechanical effects of the imbalance in the jaw mechanism.MethodsIn this study to determine the effects of the imbalance in the jaw to the strength of the arms, we conducted experiments with a pool of 20 healthy subjects of both genders. The subjects were asked to resist a pull down force applied on the contralateral arm while biting on a firm spacer using one side of the jaw. Four different muscles – masseter muscles, deltoid muscles, bicep muscles and trapezoid muscles – were involved. Integrated EMG (iEMG) and Higuchi fractal dimension (HFD) were used to analyze the EMG signals.ResultsThe results showed that (1) Imbalance in the jaw causes loss of arm strength contra-laterally; (2) The loss is approximately a linear function of the height of the spacers. Moreover, the iEMG showed the intensity of muscle activities decreased when the degrees of jaw imbalance increased (spacer thickness increased). In addition, the tendency of Higuchi fractal dimension decreased for all muscles.ConclusionsThis finding indicates that muscle fatigue and the decrease in muscle contraction level leads to the loss of arm strength.

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Effect of experimental pain on EMG-activity in human jaw-closing muscles in different jaw positions

Cited by 12 publications

References 36 publications

Effect of experimental anterior temporalis muscle pain on jaw movements

Effect of experimental anterior temporalis muscle pain on jaw movements

Effect of experimental jaw muscle pain on EMG activity and bite force distribution at different level of clenching

Analyzing surface EMG signals to determine relationship between jaw imbalance and arm strength loss

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