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J Appl Physiol 48: 821-825, 1980;
8750-7587/80 $5.00
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Journal of Applied Physiology, Vol 48, Issue 5 821-825, Copyright © 1980 by American Physiological Society

ARTICLES

Enhanced thrombin and plasmin activity with exercise in man

T. M. Hyers, B. J. Martin, D. S. Pratt, R. B. Dreisin and J. J. Franks

We measured products of thrombin and plasmin action and of the platelet release reaction during exercise to determine if the well-known effect of exercise on in vitro coagulation and fibrinolytic tests reflects activity of these systems in vivo. Plasma fibrinopeptide A, produced by thrombin-mediated proteolysis of fibrinogen, increased with graded treadmill and cycle exercise to postexercise levels of 20--30 times resting values. Fibrin/fibrinogen-related D antigen increased in a similar fashion with peak levels at maximal O2 uptake. Plasma-activated partial thromboplastin times fell as fibrinopeptide A levels increased. Unheated fibrin plate lysis areas increased as D antigen concentrations rose, indicating increased release of plasminogen activator. In contrast to activation of the soluble coagulation and fibrinolytic systems, platelet counts and plasma levels of beta-thromboglobulin, a platelet release protein, did not change significantly with exercise. The effect of exercise on thrombin and plasmin was not influenced by prior physical training, but appeared to be less with cycle exercise than with treadmill exercise.


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