Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Conditioning of the masseter inhibitory reflex by homotopically applied painful heat in humans
Autore:
Andersen, OK; Svensson, P; Ellrich, J; Arendt-Nielsen, L;
Indirizzi:
Univ Aalborg, Ctr Sensory Motor Interact, DK-9220 Aalborg, Denmark Univ Aalborg Aalborg Denmark DK-9220 Interact, DK-9220 Aalborg, Denmark Aarhusrhus,, Royal Dent Coll, Dept Prosthet Dent & Stomatognath Physiol, Aa Aarhus Univ Aarhus Denmark ept Prosthet Dent & Stomatognath Physiol, Aa UnivGermanyen Nurnberg, Inst Physiol & Expt Pathophysiol, D-8520 Erlangen,Univ Erlangen Nurnberg Erlangen Germany D-8520 physiol, D-8520 Erlangen,
Titolo Testata:
ELECTROMYOGRAPHY AND MOTOR CONTROL-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
fascicolo: 6, volume: 109, anno: 1998,
pagine: 508 - 514
SICI:
0924-980X(199812)109:6<508:COTMIR>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXTEROCEPTIVE SUPPRESSION; MUSCLE-ACTIVITY; STIMULATION; PERIODS; MECHANISMS; RESPONSES; STIMULUS; BLINK;
Keywords:
masseter inhibitory reflex; painful heat conditioning;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Andersen, OK Univ Aalborg, Ctr Sensory Motor Interact, Fredrik Bajers Vej 7 D-3, DK-9220 Univ Aalborg Fredrik Bajers Vej 7 D-3 Aalborg Denmark DK-9220
Citazione:
O.K. Andersen et al., "Conditioning of the masseter inhibitory reflex by homotopically applied painful heat in humans", ELECT MOTOR, 109(6), 1998, pp. 508-514

Abstract

During contraction of the jaw-closing muscles, afferent input from the intraoral and perioral region can elicit two bilateral suppression periods (SP1 and SP2, respectively) in the masseter electromyogram (EMG). Non-painful electrical stimulation 2 cm from the left labial commissure was used in thepresent study to evoke these trigeminal inhibitory reflexes. The subjects maintained a level of 50% of their maximum masseter EMG. The degree of suppression was quantified as the percentage suppression of the mean EMG activity in a fixed post-stimulus interval (SP2, 40-90 ms). Further, brief (200 ms) painful radiant heat conditioning stimuli were delivered to the ipsilateral cheek, in order to investigate the influence of nociceptive input on the (non-nociceptive) trigeminal masseter inhibitory reflex. Nine different conditions combining radiant heat and electrical stimuli were used. Twelve stimuli were presented for each condition. The radiant heat preceded the electrical test stimuli by fixed inter-stimulus intervals (ISI), ranging from 100 ms to 500 ms. At 250-350 ms ISIs, the bilateral SP2 suppression was significantly reduced to less than 10%, in comparison to an average suppression degree of 32.5% without conditioning stimuli. The subjects perceived the heat stimulus before the electrical stimulus for a majority of the 12 pairsof stimuli at these ISIs. No differences were found in the VAS ratings forthe different conditions. For the contralateral SP1, larger suppression was seen for the 300 ms ISI compared with stimulation without conditioning heat stimuli. Onset and offset for the SPT was, however, only detected in three subjects using a criteria of 20% suppression of the pre-stimulus activity. A pre-pulse inhibitory effect onto inter-neurons in the SP2 pathways or habituation of the same inter-neurons by the heat stimuli are suggested as possible explanations for the interaction between the non-nociceptive and nociceptive input in the present study. (C) 1998 Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/11/20 alle ore 21:13:17