Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
MUSCLE-FIBER TYPE COMPOSITION AND FIBER SIZE IN SUCCESSFULLY AND UNSUCCESSFULLY ENDURANCE-RACED HORSES
Autore:
RIVERO JLL; SERRANO AL; HENCKEL P; AGUERA E;
Indirizzi:
UNIV CORDOBA,FAC VET SCI,DEPT COMPARAT ANAT & PATHOL ANAT,ANAT & EMBRYOL UNIT,MED AZAHARA 9 E-14005 CORDOBA SPAIN NATL INST ANIMAL SCI,DEPT RES PIGS & HORSES DK-8830 TJELE DENMARK
Titolo Testata:
Journal of applied physiology
fascicolo: 4, volume: 75, anno: 1993,
pagine: 1758 - 1766
SICI:
8750-7587(1993)75:4<1758:MTCAFS>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
SKELETAL-MUSCLE; STANDARDBRED TROTTERS; GLYCOGEN DEPLETION; ENZYME-ACTIVITIES; INTERVAL; RUNNERS;
Keywords:
EQUINE EXERCISE PHYSIOLOGY; MUSCLE BIOPSY; HISTOCHEMISTRY; MORPHOMETRY; HORSE PERFORMANCE; PHYSIOLOGICAL ADAPTATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
35
Recensione:
Indirizzi per estratti:
Citazione:
J.L.L. Rivero et al., "MUSCLE-FIBER TYPE COMPOSITION AND FIBER SIZE IN SUCCESSFULLY AND UNSUCCESSFULLY ENDURANCE-RACED HORSES", Journal of applied physiology, 75(4), 1993, pp. 1758-1766

Abstract

Triplicate biopsies from three different depths of the gluteus mediusmuscle were obtained in 36 endurance-raced horses, aged 8.42 +/- 2.85yr. Twenty of the horses were considered excellent endurance performers according to the mean speed of their three fastest records in endurance events for the past 2 or 3 years, whereas 16 were moderate performers, with a mean racing speed <12.5 km/h (in 120- to 180-km endurancerides), <14 km/h (in 80- to 120-km endurance rides), or <13.5 km/h (in 40- to 60-km endurance rides). Significant differences in muscle fiber type composition and fiber size were recorded; excellent performershad a higher percentage and a larger size of type I and type IIa fibers (high and low myosin adenosinetriphosphatase activity at pH 4.5, respectively) and a lower percentage of type IIb fibers (moderate myosinadenosinetriphosphatase activity at pH 4.5), including both type IIb oxidative (moderate to high NADH-tetrazolium reductase activity) and IIb nonoxidative (low NADH-tetrazolium reductase activity). The differences in distribution of myofiber types and in fiber sizes were more marked in the deeper parts compared with the superficial regions of muscle. Our results also imply a greater homogeneity among the fiber type sizes across the muscle in horses with a superior endurance performance than in horses that had been poorly or moderately endurance raced. Thus the results show that fiber type proportions and fiber size in equine skeletal muscle are directly related to the athletic ability of the horse for endurance events.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 22:46:52