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Titolo:
EFFECT OF A WARM-UP ON ENERGY SUPPLY DURING HIGH-INTENSITY EXERCISE IN HORSES
Autore:
TYLER CM; HODGSON DR; ROSE RJ;
Indirizzi:
UNIV SYDNEY,DEPT VET CLIN SCI SYDNEY NSW 2006 AUSTRALIA UNIV SYDNEY,DEPT VET CLIN SCI SYDNEY NSW 2006 AUSTRALIA UNIV SYDNEY,DEPT ANIM HLTH CAMDEN NSW 2570 AUSTRALIA
Titolo Testata:
Equine veterinary journal
fascicolo: 2, volume: 28, anno: 1996,
pagine: 117 - 120
SICI:
0425-1644(1996)28:2<117:EOAWOE>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACCUMULATED OXYGEN DEFICIT; ANAEROBIC CAPACITY; LACTATE CONCENTRATIONS; DEBT;
Keywords:
HORSE; AEROBIC; ANAEROBIC; OXYGEN UPTAKE KINETICS; OXYGEN DEFICIT; ENERGY PARTITIONING;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
C.M. Tyler et al., "EFFECT OF A WARM-UP ON ENERGY SUPPLY DURING HIGH-INTENSITY EXERCISE IN HORSES", Equine veterinary journal, 28(2), 1996, pp. 117-120

Abstract

The V overdot O-2max in racehorses is approximately double that of elite human athletes and the rate of increase in V overdot O-2 at the onset of high intensity exercise is much greater than in man, The kinetics of gas exchange are affected by a warm-up prior to exercise in humans, there being a greater aerobic contribution to high intensity exercise after warm-up, Our hypothesis was that a warm-up would increase aerobic energy delivery in racehorses during high intensity exercise, Thirteen fit Standardbred racehorses ran to fatigue at 115% of V overdotO-2max On a treadmill at 10% slope, Prior to acceleration, horses were exercised either for 5 min at 50% V overdot O-2max followed by 5 minwalk, or walked for 2 min, Samples of expired gas were collected every 10 s during the run for determination of V overdot O-2 and V overdotCO2 and measurement of maximal accumulated oxygen deficit (MAOD), Blood lactate concentration was measured 5 min post exercise, We found that with a warm-up, horses had faster kinetics of gas exchange and a greater proportion of their total energy requirement was supplied by aerobic sources. The aerobic contribution to total energy requirement with and without warm-up was, respectively, 79.3 +/- 1.0% and 72.4 +/- 1.7% (P < 0.01). There was also a higher MAOD (P < 0.01) in horses that had not been given a warm-up (mean +/- s.e.m. 34.7 +/- 2.6 and 47.3 +/- 2.6 mlO(2)eq/kg bwt with and without a warm-up respectively), However, there were no significant differences in total run time or estimated total energy expenditure between the 2 protocols. We concluded that during high intensity exercise to fatigue lasting 1 to 2 min, more than 70% of energy supply is from aerobic energy sources and that this contribution is even greater when the horses have received a warm-up.

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Documento generato il 04/04/20 alle ore 11:57:01