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Titolo:
Plasma cortisol and beta-endorphin concentrations in trained and over-trained standardbred racehorses
Autore:
Golland, LC; Evans, DL; Stone, GM; Tyler-McGowan, CM; Hodgson, DR; Rose, RJ;
Indirizzi:
Univ Sydney, Dept Anim Sci, Sydney, NSW 2006, Australia Univ Sydney Sydney NSW Australia 2006 im Sci, Sydney, NSW 2006, Australia Univ Sydney, Dept Vet Clin Sci, Sydney, NSW 2006, Australia Univ Sydney Sydney NSW Australia 2006 in Sci, Sydney, NSW 2006, Australia Univ London Royal Vet Coll, Dept Farm Anim & Equine Med & Surg, Hatfield AL9 7TA, Herts, England Univ London Royal Vet Coll Hatfield Herts England AL9 7TA Herts, England
Titolo Testata:
PFLUGERS ARCHIV-EUROPEAN JOURNAL OF PHYSIOLOGY
fascicolo: 1-2, volume: 439, anno: 1999,
pagine: 11 - 17
SICI:
0031-6768(199912)439:1-2<11:PCABCI>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORTICOTROPIN-RELEASING HORMONE; ADRENOCORTICAL FUNCTION; HORSES; EXERCISE; RESPONSES; SWIMMERS;
Keywords:
exercise; training; over-training; cortisol; beta-endorphin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
35
Recensione:
Indirizzi per estratti:
Indirizzo: Evans, DL Univ Sydney, Dept Anim Sci, Sydney, NSW 2006, Australia Univ Sydney Sydney NSW Australia 2006 dney, NSW 2006, Australia
Citazione:
L.C. Golland et al., "Plasma cortisol and beta-endorphin concentrations in trained and over-trained standardbred racehorses", PFLUG ARCH, 439(1-2), 1999, pp. 11-17

Abstract

The effects of training and over-training on plasma cortisol and P-endorphin (PEP) concentrations at rest and after standardised exercise tests and the cortisol responses to,adrenocorticotropin (ACTH) administration were investigated in standardbred horses. Twelve horses were divided randomly into control and over-trained (OT) groups after 17 weeks slow- and moderate-intensity treadmill training, The standardised treadmill exercise test consisted of 2 min at velocities corresponding to 30, 50, 70 and 100% of maximum O-2 consumption. Overtraining, defined as a significant decrease in body weight and treadmill run-time-to-fatigue in an incremental velocity test, occurred in the OT group after 32 weeks of training exercise, Peak cortisol concentrations after exercise decreased significantly in the OT group from 320+/-15.6 at week 8 to 245+/-17.0 nmol l(-1) at week 32, and mean cortisol concentrations over a 120-min period after exercise decreased from 258+/-11.7 to 192+/-16.6 nmol l(-1) (P<0.05).: Mean and total cortisol and PEP concentrations in resting horses were not significantly different after over-training. Peak cortisol concentrations after adrenocorticotropin (ACTH) administration were not significantly different in the over-trained group. Dysfunction of the hypothalamo-pituitary-adrenocortical axis occurs in over-trainedhorses, but this adaptation is not associated with a change in the adrenocortical responsiveness to ACTH.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 21:05:27