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Titolo:
FATIGUE-INDUCED CHANGES IN GROUP-IV MUSCLE AFFERENT ACTIVITY - DIFFERENCES BETWEEN HIGH-FREQUENCY AND LOW-FREQUENCY ELECTRICALLY-INDUCED FATIGUES
Autore:
DARQUES JL; JAMMES Y;
Indirizzi:
FAC MED MARSEILLE,LAB PHYSIOPATHOL RESP,INST JEAN ROCHE,BLVD DRAMARD F-13916 MARSEILLE 20 FRANCE FAC MED MARSEILLE,LAB PHYSIOPATHOL RESP,INST JEAN ROCHE F-13916 MARSEILLE 20 FRANCE
Titolo Testata:
Brain research
fascicolo: 1-2, volume: 750, anno: 1997,
pagine: 147 - 154
SICI:
0006-8993(1997)750:1-2<147:FCIGMA>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
STIMULATED CONTRACTIONS; GROUP-III; VOLUNTARY CONTRACTIONS; EXCITATION-FREQUENCY; CELLULAR MECHANISMS; SKELETAL-MUSCLE; RESPONSES; ISCHEMIA; DISCHARGE; POTASSIUM;
Keywords:
MUSCLE FATIGUE; GROUP IV MUSCLE AFFERENT; M WAVE; RABBIT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
30
Recensione:
Indirizzi per estratti:
Citazione:
J.L. Darques e Y. Jammes, "FATIGUE-INDUCED CHANGES IN GROUP-IV MUSCLE AFFERENT ACTIVITY - DIFFERENCES BETWEEN HIGH-FREQUENCY AND LOW-FREQUENCY ELECTRICALLY-INDUCED FATIGUES", Brain research, 750(1-2), 1997, pp. 147-154

Abstract

Recordings of group TV afferent activity of tibialis anterior muscle were performed in paralysed rabbits during runs of electrically induced fatigue produced by direct muscle stimulation at a high (100 Hz, high-frequency fatigue HFF) or a low rate (10 Hz, low-frequency fatigue LFF). In addition to analysis of afferent nerve action potentials, muscle force and compound muscle action potentials (M waves) elicited by direct muscle stimulation with single shocks were recorded. Changes in M wave configuration were used as an index of the altered propagation of membrane potentials and the associated efflux of potassium from muscle fibers. The data show that increased group IV afferent activity occurred during LFF as well as HFF trials and developed parallel with force failure. Enhanced afferent activity was significantly higher during LFF (maximal Delta f(impulses) = 249 +/- 35%) than HFF (147 +/- 45%). No correlation was obtained between the responses of group TV afferents to LFF or to pressure exerted on tibialis anterior muscle. On the other hand, decreased M wave amplitude was minimal with LFF while it was pronounced with HFF. Close correlations were found between fatigue-induced activation of group IV afferents and decreases in force or M wave amplitude, but their strength was significantly higher with LFF compared to HFF. Thus, electrically induced fatigue activates group IV muscle afferents with a prominent effect of low-frequency stimulation. The mechanism of muscle afferent stimulation does not seem to be due to the sole increase in extracellular potassium concentration, but alsoby the efflux of muscle metabolites, present during fatiguing contractions at low rate of stimulation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 23:04:27