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  • Author or Editor: Patricia L. Maykuth x
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Summary

Packed cell volume and plasma total protein (tp), serum albumin (Alb) and globulin (Glb), and plasma ionized calcium (PCa) concentrations, blood viscosity ( bv ), and plasma viscosity (pv) were measured in 42 horses at rest and after the cross country jumping phase of a horse trial competition. The bv and pv were determined at 6 shear rates (230, 115, 46, 23, 11.5, 5.75 s−1), using a digital rotational cone and plate microviscometer. A paired t-test was used to determine differences between pcv, tp, Alb, Glb and PCa values at rest and after exercise. The pcv, tp, Alb, and Glb values increased (P < 0.05) in horses after exercise. The PCa concentration decreased (P < 0.05) in horses after exercise. Mean bv and pv in the 42 horses at rest and after exercise were fitted to an asymptotic function. Significant (P < 0.05) correlation at all shear rates was seen between bv at rest and pcv, tp, Alb, Glb, and PCa values at rest; and between bv after exercise and pcv, tp, Alb, Glb, and PCa values after exercise. Significant correlation was not seen between pv at rest and tp, Alb, Glb, and PCa at rest, or between pv after exercise and tp, Alb, Glb, and PCa concentrations after exercise at any shear rate.

Free access
in American Journal of Veterinary Research

SUMMARY

Blood ionized calcium (Ca2+) and pH; plasma lactate concentrations; and total protein, total calcium (CaT), albumin, and phosphorus concentrations in serum were determined in 40 healthy horses before (T1), at the finish line (T2), and 10 minutes after the finish (T3) of the cross-country phase of a 3-day-event competition. Mean (± sem) Ca2+ concentrations decreased from 6.22 ± 0.04 mg/dl at T1 to 5.04 ± 0.07 mg/dl at T2 (P ≤ 0.05). This decrease was accompanied by a nonsignificant increase in CaT between T1 and T2. The mean (± sem) percent ionization of calcium decreased significantly (P ≤ 0.05), from 50.9 ± 2.75% at T1 to 40.3 ± 3.58% at T2. Significant increases in mean albumin, total protein, phosphorus, and lactate concentrations and a significant decrease in mean pH were observed at T2 (P ≤ 0.05). At T3, mean Ca2+ and percent ionization had increased, but remained significantly less than resting values. Mean CaT was significantly decreased at T3, compared with values at T1 and T2. Correlation of mean Ca2+ concentration with all other measured variables at each time was evaluated; correlation coefficients between mean Ca2+ and all other variables were low (r 2 ≤ 0.38), indicating low biological significance.

Free access
in American Journal of Veterinary Research

Summary

Body weight of 48 horses competing in a 3-day event was measured the day before the event (baseline), following the dressage phase of the event (day 1), after the endurance phases of the event (day 2), and 18 to 24 hours after the endurance phases (day 3). Plasma sodium and potassium concentrations were measured the evening before, immediately after, and 10 minutes after the endurance phases. Total body water, water loss, and net exchangeable cation loss were then calculated.

Body weight and total body water were significantly decreased, compared with baseline values, at all times during the event, and significant water loss was detected. The largest changes were recorded after the endurance phases of the event. Water deficits were still detected 18 to 24 hours after the endurance phases of the event.

Mean plasma sodium concentration was significantly increased immediately after the endurance phases of the event, compared with concentration measured the evening before, and remained increased after the 10-minute recovery period, presumably because of dehydration. Mean plasma potassium concentration was significantly increased immediately after the endurance phases of the event, compared with concentration measured the evening before, but was not increased after the 10-minute recovery period.

Free access
in Journal of the American Veterinary Medical Association