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Re: [RC] [RC] [SPAM] [RC] Pounds of hay - Eleanor Kellon

This is a lot slower even than the speeds you're talking about, but the changes are there:
 
Equine Vet J Suppl. 2006 Aug;(36):37-42. Links

Changes in selected physiological and laboratory measurements in elite horses competing in a 160 km endurance ride.

Department of Large Animal Clinical Sciences, Michigan State University, East Lansing, Michigan, USA.

REASON FOR PERFORMING STUDY: Limited information exists about the physiological changes and clinical problems that occur in elite horses competing in high-speed 160 km endurance races. OBJECTIVES: To provide initial data describing changes in physiological and laboratory measurements in horses competing in a high-speed, 160 km endurance race under temperate conditions and to compare data between horses that successfully completed the race and those that failed to finish. METHODS: Body mass (BM) was measured, blood samples were collected, and veterinary examinations performed on horses before, during, and at the finish of a CEI*** 160 km endurance race. RESULTS: Of 36 horses participating in the study, 22 (61%) completed the race. Twelve horses were eliminated for lameness and 2 for persistent heart rate elevation. Mean speed of finishers was 15.2 km/h. Mean +/- s.d. BM loss of finishers at the end of the race (5.7 +/- 2.6%) was not different (P = 0.58) from BM loss of nonfinishers at elimination (6.7 +/- 34%). Similarly, there were no significant differences in heart rate or veterinary assessment of hydration at the race end for finishers as compared to the elimination point for nonfinishers. PCV increased while sodium, chloride and potassium concentrations decreased with exercise but differences between finishers and nonfinishers were not detected. In contrast, both total and ionised calcium concentrations decreased in successful horses but remained unchanged in nonfinishers. CONCLUSIONS: Elite endurance horses are more likely to be eliminated from competition for lameness than metabolic problems; however, it remains unclear whether these conditions are entirely distinct. The magnitude of the decrease in sodium concentration in both finishers and nonfinishers was greater than in previous reports of 160 km rides. POTENTIAL RELEVANCE: These data should be of use for both organisers and participants in elite 160 km endurance races. The tendency toward hyponatraemia as well as the difference in calcium concentrations between finishers and nonfinishers warrant further study.

 

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Am J Vet Res. 2003 Jun;64(6):746-53. Links

Body weight, hematologic findings, and serum and plasma biochemical findings of horses competing in a 48-, 83-, or 159-km endurance ride under similar terrain and weather conditions.

Department of Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA.

OBJECTIVE: To compare physiologic, hematologic, and selected serum and plasma biochemical variables obtained from horses competing in 48-, 83-, or 159-km endurance rides before competition and at the same cumulative distance points. ANIMALS: 83 horses. PROCEDURE: Weight and rectal temperature measurements and blood samples were obtained from horses before, during, and after 1 of 3 rides conducted on the same day. Plasma protein (PP), lactate, WBC, serum electrolyte, and calcium concentrations; PCV; and creatine kinase (CK) activity were determined. Assessments were made to determine whether any differences among groups, with respect to total distance competed, could be explained by differences in lap speed or conditioning and to investigate the effect of time in transit or on-site prior to competition on results of blood analyses or competition outcome. RESULTS: Horses in the 159-km distance group had the lowest preride serum sodium, chloride, bicarbonate, and calcium concentrations. As hours in transit increased, preride PP concentration was significantly greater; serum sodium, chloride, and bicarbonate concentrations were lower; CK activity at 159 km was greater; and horses were more likely to be eliminated. The preride sodium was significantly greater in horses that completed the ride, compared with those eliminated. CONCLUSIONS AND CLINICAL RELEVANCE: Among distance groups, distance ridden, speed, level of fitness, and years of experience of horses had little effect on the variables examined. Electrolyte and water supplementation and earlier arrival at the event may be beneficial for horses that are transported long distances to endurance competition.

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Am J Vet Res. 1982 Dec;43(12):2239-43. Links

Changes in selected biochemical constituents of blood collected from horses participating in a 50-mile endurance ride.

The effects of strenuous exercise on serum electrolytes, blood metabolites, and serum enzymes were studied in a group of 13 horses participating in a 50-mile endurance ride. Blood samples were collected before, during, and at the end of the ride, as well as 1 hour and 16 hours after the completion of the ride. There were significant changes in these values when preride values were compared with those of samples taken at different sample-collection periods. Significant (P less than 0.001) decreases were observed in serum concentrations of chloride, potassium, and calcium. A significant increase in the serum concentration of phosphorous also was observed. The mean concentrations of chloride and calcium remained significantly reduced in the 16-hour postride sample......

 

I can't find a link to Dr. Coenen's studies but there is a presentation from here here:

http://books.google.com/books?id=-6ugFvSw3SEC&pg=PA283&lpg=PA283&dq=coenen+chloride+horse&source=web&ots=OUTRk1DFtZ&sig=YapZGWT2jDGhQ3vHvwjSpWdnjWs#PPA273,M1

The electrolytes section starts on page 273.

How do the French do it? I have no idea! What do they feed? Do they electrolyte preride, at least salt during the ride? The sweat loses and inescapable. The acidosis from higher speed work might help tie up some of the free bicarbonate and in turn reduce the risk of drops in ionized calcium and magnesium.

Eleanor


--
Eleanor M. Kellon, V.M.D.
Equine Nutritional Solutions
58 Maple Farm Road
Ephrata, PA 17522
Replies
RE: [SPAM] [RC] Pounds of hay, heidi
Re: [RC] [SPAM] [RC] Pounds of hay, Eleanor Kellon
RE: [RC] [SPAM] [RC] Pounds of hay, Karen Standefer