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Alterations in blood viscosity in horses competing in cross country jumping

1994; American Veterinary Medical Association; Volume: 55; Issue: 3 Linguagem: Inglês

10.2460/ajvr.1994.55.03.389

1943-5681

Carla S. Sommardabl, Frank M. Andrews, Arnold M. Saxton, Dennis R. Geiser, Patricia L. Maykuth,

Sports Performance and Training

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.