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Titolo:
Conditioning of heteronymous H reflex in human temporalis muscle by stimulation of perioral afferents
Autore:
Macaluso, GM; Graven-Nielsen, T; Svensson, P;
Indirizzi:
Univ Aalborg, Ctr Sensory Motor Interact, Orofacial Pain Lab, DK-9220 Aalborg S, Denmark Univ Aalborg Aalborg Denmark S cial Pain Lab, DK-9220 Aalborg S, Denmark Univ Parma, Ist Clin Odontoiatr, I-43100 Parma, Italy Univ Parma Parma Italy I-43100 Ist Clin Odontoiatr, I-43100 Parma, Italy Aarhus Univ, Royal Dent Coll, Dept Prosthet Dent & Stomatognath Physiol, DK-8000 Aarhus C, Denmark Aarhus Univ Aarhus Denmark C atognath Physiol, DK-8000 Aarhus C, Denmark Aalborg Hosp, Dept Oral & Maxillofacial Surg, DK-9000 Aalborg, Denmark Aalborg Hosp Aalborg Denmark DK-9000 cial Surg, DK-9000 Aalborg, Denmark
Titolo Testata:
EXPERIMENTAL BRAIN RESEARCH
fascicolo: 1, volume: 136, anno: 2001,
pagine: 114 - 119
SICI:
0014-4819(200101)136:1<114:COHHRI>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN MASSETER; MOTOR UNITS; EXTEROCEPTIVE SUPPRESSION; MOTONEURON POOL; M-RESPONSES; JAW; MODULATION; PAIN; INHIBITION; FIBERS;
Keywords:
exteroceptive suppression; H reflex; masticatory muscles; trigeminal reflexes; presynaptic inhibition;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Svensson, P Univ Aalborg, Ctr Sensory Motor Interact, Orofacial Pain Lab, Fredrik Bajers Vej 7 D-3, DK-9220 Aalborg S, Denmark Univ Aalborg Fredrik Bajers Vej 7 D-3 Aalborg Denmark S nmark
Citazione:
G.M. Macaluso et al., "Conditioning of heteronymous H reflex in human temporalis muscle by stimulation of perioral afferents", EXP BRAIN R, 136(1), 2001, pp. 114-119

Abstract

A heteronymous H reflex in the temporalis muscle can be elicited by selective stimulation of the masseteric nerve. The present study aimed at defining the optimal amplitude of the H reflex to detect inhibitory changes induced by stimulation of the perioral afferents and at providing new informationon the control of masticatory muscles. Sixteen healthy volunteers participated in the experiment. A conditioning stimulus (CS) to the perioral skin was applied at various delays before an ipsilateral selective masseteric nerve stimulation (test stimulus: TS) while the subject was clenching the teeth at 25% of the maximal voluntary contraction. Two intensities of CS and TSwere employed, high and low. The peak-to-peak amplitude of the H reflex (TS) and the root-mean-square value of the preceding electromyography were measured and the data analyzed by three-way analysis of variance and Tukey's posthoc tests. For both intensities used the heteronymous H reflex in the temporalis muscle was significantly decreased by prior activation of perioral afferents for delays from 5 to 60 ms. With a delay of 5 and 35 ms the preceding EMG level was not changed, while it was reduced at 20 and 60 ms delay. The intensities used to elicit the heteronymous H reflex of the temporalis muscle were appropriate to detect a reduction in motoneuron excitability. The reduction in the H reflex without a change in the preceding EMG at 5 and 35 ms delays could be due to presynaptic inhibition of the masseteric afferents exerted by the ipsilateral perioral afferents.

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Documento generato il 28/11/20 alle ore 21:46:03