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Changes in the fibrinolytic system associated with physical conditioning.
J A De Paz1, J Lasierra, J G Villa
1Service of Hematology, San Millán Hospital, Logroño, Spain.
Summary
Physical conditioning enhances plasma fibrinolytic activity, increasing fibrin degradation products (FbDP) and fibrinogen degradation products (FgDP). Trained individuals show a greater fibrinolytic response to exercise due to higher tissue plasminogen activator (t-PA) release.
Area of Science:
- Physiology
- Exercise Science
- Hemostasis
Background:
- Fibrinolysis is crucial for blood clot breakdown.
- Physical conditioning's impact on fibrinolysis requires further investigation.
- Aerobic conditioning may influence the fibrinolytic system.
Purpose of the Study:
- To compare plasma fibrinolytic activity between conditioned athletes and untrained individuals.
- To assess the effects of maximal exercise on fibrinolysis in both groups.
- To elucidate the mechanisms behind exercise-induced fibrinolysis.
Main Methods:
- Two groups studied: untrained controls and aerobic-conditioned middle-distance runners.
- Plasma fibrinolytic components measured pre- and post-maximal treadmill exercise.
- Analysis included plasminogen, fibrinogen, inhibitors, and degradation products (FbDP, FgDP).
Main Results:
- Trained runners had higher resting FbDP and FgDP, indicating enhanced basal fibrinolytic potential.
- Maximal exercise induced significant fibrinolysis in both groups.
- Conditioned individuals exhibited a more pronounced fibrinolytic response to exercise.
Conclusions:
- Aerobic conditioning potentiates plasma fibrinolytic activity.
- Enhanced fibrinolysis in trained individuals may stem from increased tissue plasminogen activator (t-PA) release and reduced t-PA-plasminogen activator inhibitor (t-PA-PAI) complex formation.
- Physical fitness plays a significant role in modulating the body's response to exercise-induced fibrinolysis.