Effect of experimental jaw‐muscle pain on the spatial distribution of surface EMG activity of the human masseter muscle during tooth clenching

Castroflorio, Tommaso; Falla, Deborah; Wang, Kelun; Svensson, Peter; Farina, Dario

doi:10.1111/j.1365-2842.2011.02246.x

Cited by 34 publications

(23 citation statements)

References 67 publications

(108 reference statements)

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“…However, in recent work, Castroflorio et al. (6) showed that larger‐motor units are not recruited in the painful masseter. Thus, the larger‐motor‐unit hypothesis could not explain the observed results.…”

Section: Discussionmentioning

confidence: 97%

“…In recent work, Castroflorio et al. (6) reported that the masseter muscle shows a more uniform spatial distribution of the EMG activity after experimentally induced pain, because of a larger decrease in activity of the muscle regions with initial larger activity. Thus, although lower values of ARV were not observed for the masseter muscle in the patients with TMD, different regions of the masseter muscle, which were not recorded by the electrode array used in this study, may have responded differently.…”

Section: Discussionmentioning

confidence: 99%

“…Muscle pain is known to influence muscle activity (3–7) but the effects of muscle pain on the control of jaw elevator muscles have not been fully described. Furthermore, the relation between jaw muscle pain and muscle fatigue is still unclear.…”

Section: Introductionmentioning

confidence: 99%

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Myoelectric manifestations of jaw elevator muscle fatigue and recovery in healthy and TMD subjects

Castroflorio

Falla

Tartaglia

et al. 2012

J of Oral Rehabilitation

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The effects of muscle pain and fatigue on the control of jaw elevator muscles are not well known. Furthermore, the myoelectric manifestations of fatigue and recovery from fatigue in the masticatory muscles are not reported in literature. The main aims of this study were (i) to evaluate the possible use of surface electromyography (sEMG) as an objective measure of fatigue of the jaw elevator muscles, (ii) to compare the myoelectric manifestations of fatigue in the temporalis anterior and masseter muscles bilaterally, (iii) to assess recovery of the investigated muscles after an endurance test and (iv) to compare fatigue and recovery of the jaw elevator muscles in healthy subjects and patients with muscle-related temporomandibular disorders (TMD). The study was performed on twenty healthy volunteers and eighteen patients with muscle-related TMD. An intra-oral compressive-force sensor was used to measure the voluntary contraction forces close to the intercuspal position and to provide visual feedback of submaximal forces to the subject. Surface EMG signals were recorded with linear electrode arrays during isometric contractions at 20%, 40%, 60% and 80% of the maximum voluntary contraction force, during an endurance test and during the recovery phase. The results showed that (i) the slope of the mean power spectral frequency (MNF) and the initial average rectified value (ARV) could be used to monitor fatigue of the jaw elevators, (ii) the temporalis anterior and masseter muscle show the same myoelectric manifestations of fatigue and recovery and (iii) the initial values of MNF and ARV were lower in patients with muscle-related TMD. The assessment of myoelectric manifestations of fatigue in the masticatory muscles may assist in the clinical assessment of TMDs.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

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Myoelectric manifestations of jaw elevator muscle fatigue and recovery in healthy and TMD subjects

Castroflorio

Falla

Tartaglia

et al. 2012

J of Oral Rehabilitation

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“…However, the spatial interpretation of this finding is unclear as the location of the intramuscular electrode within the motor unit territory is unknown. High-density surface electromyography (HDsEMG) has revealed regional re-distribution of activation within other large, multifunctional muscles such as the trapezius [7,23] and masseter [4]. This technique provides a powerful tool to assess regional variation of muscle activation in response to experimental pain.…”

Section: Introductionmentioning

confidence: 99%

Location-specific responses to nociceptive input support the purposeful nature of motor adaptation to pain

Gallina

Salomoni

Hall

et al. 2018

PAIN

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Movement is changed in pain, but the mechanisms remain unclear. Key questions are unresolved such as whether activation can be inhomogeneously distributed within a muscle in a manner that is specific to the location of noxious input. This study addressed this question using high-density electromyography (EMG) to study regional redistribution of muscle activation within the vasti muscles and changes in knee extension force direction in response to noxious stimulation applied to muscular and nonmuscular tissues around the knee. Fourteen participants performed a low-force knee extension contraction at baseline, during, and after pain induced in 4 locations (infrapatellar fat pad, vastus lateralis, distal vastus medialis, or proximal vastus medialis). The knee extension force direction was estimated from a 3-dimensional load cell positioned just above the ankle. Regional muscle activation was estimated from amplitude of high-density surface EMG signals from vastus medialis and lateralis. Pain-induced spatial variations of activation were identified as the position of the 5 channels that showed the largest decrease (or smallest increase) in amplitude from baseline to pain or after pain. Knee extension force was produced more medially during pain after infrapatellar pad injection only (P = 0.01). Preferential reduction of activation of the distal region of vastus medialis was observed when distal vastus medialis (P < 0.001) or vastus lateralis (P < 0.05) was injected. Both adaptations persisted after pain resolution. These results support the hypothesis that specific adaptation depends on the location of a noxious stimulus and imply that recovery of pain is not necessarily concomitant with return of the EMG to prepain patterns.

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“…The reason for this protracted effect of pain may be a protective reaction of the neuromuscular system to avoid further damage as indicated by the nociceptive input from the muscle . Also, on the contralateral side of pain, the EMG activity at 50% MVC, which is a functionally relevant force level required to break down food items , or 5% MVC, which may not be harmful to the stomatognathic system and is required during various oro‐facial movements, such as swallowing and talking , increased to compensate for the EMG decrease in the painful muscle.…”

Section: Discussionmentioning

confidence: 99%

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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Effect of experimental jaw‐muscle pain on the spatial distribution of surface EMG activity of the human masseter muscle during tooth clenching

Cited by 34 publications

References 67 publications

Myoelectric manifestations of jaw elevator muscle fatigue and recovery in healthy and TMD subjects

Myoelectric manifestations of jaw elevator muscle fatigue and recovery in healthy and TMD subjects

Location-specific responses to nociceptive input support the purposeful nature of motor adaptation to pain

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

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