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Titolo:
CHANGES IN THE ACTION-POTENTIAL AND CONTRACTILE PROPERTIES OF SKELETAL-MUSCLE IN HUMANS WITH REPETITIVE STIMULATION AFTER LONG-TERM DRY IMMERSION
Autore:
KORYAK Y;
Indirizzi:
INST BIOMED PROBLEMS,DEPT NEUROPHYSIOL,KHOROSHEVSKOYE SHOSSE 76A MOSCOW 123007 D7 RUSSIA
Titolo Testata:
European journal of applied physiology and occupational physiology
fascicolo: 6, volume: 74, anno: 1996,
pagine: 496 - 503
SICI:
0301-5548(1996)74:6<496:CITAAC>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOTONEURON FIRING RATES; HUMAN TRICEPS SURAE; EXCITATION-FREQUENCY; TWITCH MUSCLE; FATIGUE; IMMOBILIZATION; VOLUNTARY; RESPONSES; DISUSE; FIBER;
Keywords:
DRY IMMERSION; HUMAN TRICEPS SURAE; ISOMETRIC INTERMITTENT CONTRACTION; SURFACE ACTION POTENTIAL; MUSCLE FATIGUE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
46
Recensione:
Indirizzi per estratti:
Citazione:
Y. Koryak, "CHANGES IN THE ACTION-POTENTIAL AND CONTRACTILE PROPERTIES OF SKELETAL-MUSCLE IN HUMANS WITH REPETITIVE STIMULATION AFTER LONG-TERM DRY IMMERSION", European journal of applied physiology and occupational physiology, 74(6), 1996, pp. 496-503

Abstract

This paper compares the effects of 7-day dry immersion and intermittent muscle contraction on electrical and mechanical failure during muscle fatigue in the human triceps surae muscle electrically stimulated at 50 impulses . s(-1) via its motor nerve. Intermittent contractions of 60-s duration were separated by 1-s intervals for identical durationof tension development. The 60-s intermittent contractions decreased tetanic force to 57% (P < 0.05) of initial values, but force reductionwas not significantly different in the two fatigue tests: the fatigueindex was 36.2 (SEM 5.4)% versus 38.6 (SEM 2.8)%, respectively (P > 0.05). Whilst identical force reduction was present in the two fatigue tests, it would appear that concomitant electrical failure was considerably different. This electromechanical dissociation would suggest that a slowing of conduction along nerve and muscle membranes did not explain the observed mechanical failure. It is suggested that intracellular processes played major role in contractile failure during intermittent contractions after muscle disuse.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 18:10:36