A method for studying jaw muscle activity during standardized jaw movements under experimental jaw muscle pain

2006 ◽  
Vol 157 (2) ◽  
pp. 285-293 ◽  
Author(s):  
Daraporn Sae-Lee ◽  
Kamal Wanigaratne ◽  
Terry Whittle ◽  
Christopher C. Peck ◽  
Greg M. Murray
Keyword(s):  
Muscle Activity ◽  
Muscle Pain ◽  
Jaw Movements ◽  
Jaw Muscle

Effects of muscle fatigue induced by low-level clenching on experimental muscle pain and resting jaw muscle activity: gender differences

2006 ◽  
Vol 174 (3) ◽  
pp. 566-574 ◽  
Author(s):  
Tetsurou Torisu ◽  
Kelun Wang ◽  
Peter Svensson ◽  
Antoon De Laat ◽  
Hiroyuki Fujii ◽  
...  
Keyword(s):  
Gender Differences ◽  
Muscle Fatigue ◽  
Muscle Activity ◽  
Muscle Pain ◽  
Low Level ◽  
Experimental Muscle Pain ◽  
Jaw Muscle

Sex-Related Differences in Human Pain and Rat Afferent Discharge Evoked by Injection of Glutamate Into the Masseter Muscle

2001 ◽  
Vol 86 (2) ◽  
pp. 782-791 ◽  
Author(s):  
Brian E. Cairns ◽  
James W. Hu ◽  
Lars Arendt-Nielsen ◽  
Barry J. Sessle ◽  
Peter Svensson
Keyword(s):  
Muscle Activity ◽  
Muscle Pain ◽  
Masseter Muscle ◽  
Isotonic Saline ◽  
Muscle Afferents ◽  
Female Rats ◽  
Male Rats ◽  
Male And Female ◽  
Jaw Muscle ◽  
Nociceptive Afferents

Animal studies have suggested that tissue injury–related increased levels of glutamate may be involved in peripheral nociceptive mechanisms in deep craniofacial tissues. Indeed, injection of glutamate (0.1–1 M, 10 μl) into the temporomandibular region evokes reflex jaw muscle responses through activation of peripheral excitatory amino acid receptors. It has recently been found that this glutamate-evoked reflex muscle activity is significantly greater in female than male rats. However, it is not known whether peripheral administration of glutamate, in the same concentrations that evoke jaw muscle activity in rats, causes pain in humans or activates deep craniofacial nociceptive afferents. Therefore we examined whether injection of glutamate into the masseter muscle induces pain in male and female volunteers and, since masseter afferent recordings were not feasible in humans, whether glutamate excites putative nociceptive afferents supplying the masseter muscle of male and female rats. Injection of glutamate (0.5 M or 1.0 M, 0.2 ml) into the masseter muscle of both men and women caused significantly higher levels of peak pain, duration of pain, and overall pain than injection of isotonic saline (0.2 ml). In addition, glutamate-evoked peak and overall muscle pain in women was significantly greater than in men. In rats of both sexes, glutamate (10 μl, 0.5 M) evoked activity in a subpopulation of masseter muscle afferents ( n = 36) that projected to the subnucleus caudalis, an important relay of noxious input from the craniofacial region. The largest responses to glutamate were recorded in muscle afferents with the slowest conduction velocities (2.5–5 m/s). Further, glutamate-evoked masseter muscle afferent activity was significantly greater in female than in male rats. These results indicate that glutamate injection into the masseter muscle evokes pain responses that are greater in women than men and that one possible mechanism for this difference may be a greater sensitivity to glutamate of masseter muscle afferents in females. These sex-related differences in acute experimental masseter muscle pain are particularly interesting given the higher prevalence of many chronic muscle pain conditions in women.

The effect of experimental jaw muscle pain on postural muscle activity

Pain ◽  
1996 ◽  
Vol 66 (2) ◽  
pp. 215-221 ◽  
Author(s):  
Christian S Stohler ◽  
Xin Zhang ◽  
James P Lund
Keyword(s):  
Muscle Activity ◽  
Muscle Pain ◽  
Jaw Muscle ◽  
Postural Muscle

Effects of experimental pain on jaw muscle activity during goal-directed jaw movements in humans

2008 ◽  
Vol 189 (4) ◽  
pp. 451-462 ◽  
Author(s):  
Daraporn Sae-Lee ◽  
Terry Whittle ◽  
Anna R. C. Forte ◽  
Christopher C. Peck ◽  
Karen Byth ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Experimental Pain ◽  
Jaw Movements ◽  
Jaw Muscle

Jaw‐muscle activity during speech with the mandible fixed

1981 ◽  
Vol 69 (5) ◽  
pp. 1441-1445 ◽  
Author(s):  
John W. Folkins ◽  
Gerald N. Zimmermann
Keyword(s):  
Muscle Activity ◽  
Jaw Muscle
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