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  • Title: Evaluation of platelet activation and platelet-neutrophil aggregates in Thoroughbreds undergoing near-maximal treadmill exercise.
    Author: Weiss DJ, Evanson OA, Fagliari JJ, Valberg S.
    Journal: Am J Vet Res; 1998 Apr; 59(4):393-6. PubMed ID: 9563618.
    Abstract:
    OBJECTIVES: To determine whether platelets become activated and form platelet-neutrophil aggregates during near-maximal treadmill exercise in horses. ANIMALS: 4 Thoroughbreds. PROCEDURE: Horses were subjected to 4 standardized exercise tests on a treadmill, and blood samples were collected before exercise, at treadmill speed of 12 m/s, and 5 minutes after exercise. Flow cytometric techniques were used to identify activated platelets, and flow cytometric and microscopic techniques were used to identify platelet-neutrophil aggregates. RESULTS: Platelet-neutrophil aggregates increased from 2.8 +/- 0.4% at rest to 17.2 +/- 1.1% and 14.7 +/- 1.6% during and after exercise, respectively. Platelet activation was not detected during or after exercise. CONCLUSIONS: Platelet-neutrophil aggregates consistently form during strenuous exercise in horses.
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