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Titolo:
Body fluids and exercise: Replacement strategies
Autore:
Kronfeld, DS;
Indirizzi:
Virginia Polytech Inst & State Univ, Dept Anim & Poultry Sci, Blacksburg, VA 24136 USA Virginia Polytech Inst & State Univ Blacksburg VA USA 24136 VA 24136 USA
Titolo Testata:
JOURNAL OF EQUINE VETERINARY SCIENCE
fascicolo: 8, volume: 21, anno: 2001,
pagine: 368 - 375
SICI:
0737-0806(200108)21:8<368:BFAERS>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENDURANCE HORSES;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Kronfeld, DS Virginia Polytech Inst & State Univ, Dept Anim & Poultry Sci,Blacksburg, VA 24136 USA Virginia Polytech Inst & State Univ Blacksburg VA USA 24136
Citazione:
D.S. Kronfeld, "Body fluids and exercise: Replacement strategies", J EQUINE V, 21(8), 2001, pp. 368-375

Abstract

Athletic performance is initially enabled but then becomes limited by changes in body fluids. This review deals with potentially beneficial interventions replacement strategies. It is the second of a trilogy on exercise witha focus on body fluids. The first part (published previously in this Journal) concerned physiological changes in body fluids likely to affect performance. These changes are certain to tax the homeostatic capacity of a competitive horse, which may be supported by supplementation with water and electrolytes, before, during or after an event. The simplest replacement strategy is to completely offset depletion, so as to maintain or restore the resting status. A preferred replacement strategy emphasizes more frequent and smaller doses during an event, so as to avoid over-riding the initial beneficial changes in body fluids. Because the turning points from enabling to limiting are not well established, effective electrolyte,replacement currentlydepends as much on the rider's development of a specific dosage regimen (amounts and times), for an individual horse as on any scientist's rational design of a flexible formula for all horses. Marketed formulas are based on sweat loss and changes in plasma. Most contain Na, K and Cl; some also haveCa, Mg, P, glucose and nutraceuticals. Attention to hyperkalemia at speedsover 4 m/s suggests the need for two formulas - one without potassium for use during an event, the other with potassium for use before and after. Illustrative studies are examined for the validity of their physiological interpretations and their practical implications. They indicate various advantages from. the administration of hypertonic mixtures of electrolytes in pastes or slurries a few hours before as well as during and after an event, provided that the horse has ample opportunity to drink. Nevertheless, the physiology of absorption suggests that hypertonic mixtures should be regarded as unsuitable for a clinically hypohydrated horse until shown otherwise. Thethird part of this series will discuss the influence of nutrition and feeding management on body fluids and performance.

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Documento generato il 20/01/20 alle ore 22:13:55