In:
American Journal of Veterinary Research, American Veterinary Medical Association (AVMA), Vol. 66, No. 3 ( 2005-03-01), p. 466-473
Abstract:
Objective —To compare effects of oral supplementation
with an experimental potassium-free sodiumabundant electrolyte mixture (EM-K) with that of oral
supplementation with commercial potassium-rich mixtures (EM+K) on acid-base status and plasma ion
concentrations in horses during an 80-km endurance ride. Animals —46 healthy horses. Procedure —Blood samples were collected before
the ride; at 21-, 37-, 56-, and 80-km inspection points; and during recovery (ie, 30-minute period after the
ride). Consumed electrolytes were recorded. Blood was analyzed for pH, PvCO 2 , and Hct, and plasma was
analyzed for Na + , K + , Cl – , Ca2 + , Mg2 + , lactate, albumin,
phosphate, and total protein concentrations. Plasma concentrations of H + and HCO3 – , the strong ion difference
(SID), and osmolarity were calculated. Results —34 (17 EM-K and 17 EM+K treated) horses
finished the ride. Potassium intake was 33 g less and Na+ intake was 36 g greater for EM-K-treated horses,
compared with EM+K-treated horses. With increasing distance, plasma osmolarity; H + , Na + , K + , Mg2 + ,
phosphate, lactate, total protein, and albumin concentrations; and PvCO 2 and Hct were increased in all
horses. Plasma HCO3 – , Ca 2+ , and Cl – concentrations
were decreased. Plasma H + concentration was significantly
lower in EM-K-treated horses, compared with EM+K-treated horses. Plasma K + concentrations at
the 80-km inspection point and during recovery were significantly less in EM-K-treated horses, compared
with EM+K-treated horses. Conclusions and Clinical Relevance —Increases in
plasma H+ and K+ concentrations in this endurance ride were moderate and unlikely to contribute to signs
of muscle fatigue and hyperexcitability in horses. ( Am J Vet Res 2005;66:466–473)
Type of Medium:
Online Resource
ISSN:
0002-9645
DOI:
10.2460/ajvr.2005.66.466
Language:
Unknown
Publisher:
American Veterinary Medical Association (AVMA)
Publication Date:
2005
detail.hit.zdb_id:
2056942-7
SSG:
22
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