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Effects of Exercise on Blood Coagulation, Fibrinolysis and Platelet Aggregation

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Summary

Disturbances of the haemostatic balance may result in thrombosis or bleeding tendency. There have been abundant reports on the effects of exercise on blood haemostasis, but the results reported have been conflicting and difficult to interpret. This review outlines and critically evaluates the relevant literature on the effects of short term exercise and physical training on the 3 systems of blood haemostasis i.e. blood coagulation, fibrinolysis and platelet aggregation.

Short term exercise is usually associated with a significant shortening of activated partial thromboplastin time (APTT) and a marked increase in factor VIII (FVIII). The rise in FVIII is directly related to exercise intensity and the individuals’ training status. Exercise also induces a significant increase in blood fibrinolysis which is dependent on exercise intensity, duration and training condition. The rise in blood fibrinolysis is mainly due to an increase in tissue-type plasminogen activator (t-PA) and a decrease in its main inhibitor plasminogen activator inhibitor (PAI-1) which are released from the endothelial cells of the vessel wall.

Platelet count increases in exercise and this is probably due to a fresh release of platelets from the spleen, bone marrow and lungs. Studies on the effects of exercise on platelet aggregation and markers of platelet activation have produced conflicting results, and the exact effects of exercise remain as yet undetermined. It is suggested that short term exercise activates blood coagulation and enhances blood fibrinolysis and the delicate balance between clot formation and clot dissolution is maintained in normal populations. No valid conclusion could be reached regarding the actual effects of physical training on blood coagulation, fibrinolysis and platelet aggregation. This is undoubtedly due to variations in training programmes employed, populations studied, and the analytical methods used.

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  1. Centre for Sport and Exercise Sciences, School of Human Sciences, Liverpool John Moores University, Mountford Building, Byrom Street, Liverpool, L3 3AF, England

    Mahmoud S. El-Sayed

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El-Sayed, M.S. Effects of Exercise on Blood Coagulation, Fibrinolysis and Platelet Aggregation. Sports Med 22, 282–298 (1996). https://doi.org/10.2165/00007256-199622050-00002

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