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Titolo:
EXPERIMENTAL JAW-MUSCLE PAIN DOES NOT CHANGE HETERONYMOUS H-REFLEXES IN THE HUMAN TEMPORALIS MUSCLE
Autore:
SVENSSON P; DELAAT A; GRAVENNIELSEN T; ARENDTNIELSEN L;
Indirizzi:
UNIV AALBORG,OROFACIAL PAIN LAB,CTR SENSORY MOTOR INTERACT,FREDRIK BAJERS VEJ D-3 DK-9220 AALBORG S DENMARK UNIV AARHUS,ROYAL DENT COLL,DEPT PROSTHET DENT & STOMATOGNATH PHYSIOLDK-8000 AARHUS C DENMARK CATHOLIC UNIV LOUVAIN,DEPT ORAL & MAXILLOFACIAL SURG,CLUSTER ORAL PHYSIOL B-3000 LEUVEN BELGIUM
Titolo Testata:
Experimental Brain Research
fascicolo: 3, volume: 121, anno: 1998,
pagine: 311 - 318
SICI:
0014-4819(1998)121:3<311:EJPDNC>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
TASK-RELATED BEHAVIOR; EXTEROCEPTIVE SUPPRESSION; CLOSING MUSCLES; OPENING REFLEX; MOTOR UNITS; M-RESPONSES; MASSETER; SYSTEM; COORDINATION; ORGANIZATION;
Keywords:
EXPERIMENTAL MUSCLE PAIN; H-REFLEX; M-RESPONSE; JAW MUSCLES; TRIGEMINAL REFLEXES; MOTONEURON EXCITABILITY; HUMAN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
57
Recensione:
Indirizzi per estratti:
Citazione:
P. Svensson et al., "EXPERIMENTAL JAW-MUSCLE PAIN DOES NOT CHANGE HETERONYMOUS H-REFLEXES IN THE HUMAN TEMPORALIS MUSCLE", Experimental Brain Research, 121(3), 1998, pp. 311-318

Abstract

Muscle pain generally has an inhibitory effect on voluntary orofacialmotor function. However, it is not known whether muscle pain causes direct or indirect changes in motoneuron excitability. In this study a monopolar needle stimulation technique was used to evoke the direct motor response (M-response) in the left masseter muscle and the heteronymous H-reflex in the left temporalis muscle as an indirect measure of motoneuron excitability. Series of 20 repeated electrical stimuli weredelivered at 50% of maximal voluntary contraction (MVC) before, during, and after periods with experimental jaw-muscle pain in 11 healthy subjects. Pain was induced by standardized infusion of hypertonic (5%) saline into the mid-portion of the right masseter muscle. The mean pain intensity rating on a 100-mm visual analog scale was 42+/-5 mm. The short-latency responses (less than 6 ms) could be evoked in all subjects. Analysis of the latency and amplitude of the temporal H-reflex indicated no significant effect of jaw-muscle pain. The amplitude of the masseteric M-response was significantly smaller in the postpain condition than in the pain conditions (ANOVA, P=0.018), but no differences were found between the prepain and postpain conditions. In nine subjects, poststimulus periods (mean offset latency, 69.6+/-8.6 ms) with significantly (more than 50%) suppressed EMG activity were detected in theipsilateral masseter muscle following the M-response (mean offset latency, 5.5+/-0.2 ms). These reflex responses did not show a systematic change during the pain conditions. In conclusion, acute contralateral jaw-muscle pain does not seem to modulate the motoneuron excitability as measured by the heteronymous H-reflex.

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Documento generato il 27/11/20 alle ore 22:27:53