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Titolo:
RAT GASTROCNEMIUS HIGH AND LOW-FREQUENCY FATIGUE WITHOUT METABOLIC IMPAIRMENT BY 31P NMR
Autore:
LERUMEUR E; LEMOYEC L; DECERTAINES JD;
Indirizzi:
FAC MED RENNES,RESONANCE MAGNET BIOL & MED LAB F-35043 RENNES FRANCE FAC MED RENNES,PHYSIOL LAB F-35043 RENNES FRANCE
Titolo Testata:
Archives internationales de physiologie, de biochimie et de biophysique
fascicolo: 6, volume: 101, anno: 1993,
pagine: 371 - 376
SICI:
0778-3124(1993)101:6<371:RGHALF>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
XENOPUS MUSCLE-FIBERS; HUMAN SKELETAL-MUSCLE; INTRACELLULAR PH; STIMULATED CONTRACTIONS; EXCITATION-FREQUENCY; INORGANIC-PHOSPHATE; FORCE; CAFFEINE; RECOVERY; PHOSPHOCREATINE;
Keywords:
SKELETAL MUSCLE; GASTROCNEMIUS FATIGUE; 31P NMR; RAT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
E. Lerumeur et al., "RAT GASTROCNEMIUS HIGH AND LOW-FREQUENCY FATIGUE WITHOUT METABOLIC IMPAIRMENT BY 31P NMR", ARCH I PHYS, 101(6), 1993, pp. 371-376

Abstract

Metabolic status and intracellular pH were investigated using 31-P nuclear magnetic resonance spectroscopy during mechanical fatigue induced in rat gastrocnemius muscle in vivo by continuous stimulation eitherat low or high frequency. During high frequency stimulations, force decreased to low level (10% of initial in 3-6 min) while phosphocreatine declined abruptly to 28-30% of its initial level and pH fell to 6.36in 45 seconds. Force then continued to fall but PCr and pH rose againto reach 80-85% of the initial phosphocreatine value and 6.96 (pH) atthe end of the stimulation period. The major feature of these resultsat high frequency was that the muscle could not generate force despite high energy stores and normal pH. During low frequency stimulation, force decreased in 9 min, to 10% of initial level. Phosphocreatine decreased abruptly to become undetectable while pH declined to 6.08 in 90seconds. But later, phosphocreatine rose again to 35% and pH recovered to 6.84 while force continued to fall. Our results showed that intracellular pH and energy stores are not involved in the development and maintenance of mechanical fatigue.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 20:33:09