Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand.
Evaluation of binding of fibrinogen and annexin V to equine platelets in response to supramaximal treadmill exercise
Version of Record online: 10 JUN 2010
© 2002 EVJ Ltd
Equine Veterinary Journal
Volume 34, Issue S34, pages 502–505, September 2002
How to Cite
KINGSTON, J. K., BAYLY, W. M., MEYERS, K. M., SELLON, D. C. and WARDROP, K. J. (2002), Evaluation of binding of fibrinogen and annexin V to equine platelets in response to supramaximal treadmill exercise. Equine Veterinary Journal, 34: 502–505. doi: 10.1111/j.2042-3306.2002.tb05473.x
- Issue online: 10 JUN 2010
- Version of Record online: 10 JUN 2010
- platelet activation;
- anti-fibrinogen antibody;
- platelet-neutrophil aggregates
There is evidence that equine platelet reactivity is altered by strenuous exercise. Changes in platelet reactivity could impact haemostasis following exercise-induced injury and may play a role in the pathophysiology of exercise-induced pulmonary haemorrhage. Interpretation of results of previous studies is hindered by potential in vitro-induced changes in platelet activity through the choice of anticoagulant and the use of platelet inhibitors. The present study was undertaken to re-evaluate the effect of exercise on equine platelets using methodologies that minimise in vitro-induced changes in platelet activation.
The percentage of platelet-neutrophil aggregates increased significantly (P = 0.01) from mean ± s.e. 3.5 ± 0.6% at rest to 7.2 ± 1.3% during exercise. There were no significant changes in binding of anti-fibrinogen antibody or annexin V to platelets in response to exercise.
An inability to detect increased binding of fibrinogen or annexin V may be a result of poor test sensitivity or low statistical power. Alternatively, activated platelets may be quickly removed from the circulation and miss detection. The significance of increased numbers of platelet-neutrophil aggregates in association with exercise is currently unknown and warrants further investigation.