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Related Experiment Videos

Differences in u-PA and t-PA increase during acute exercise: relation with exercise parameters

P J van den Burg1, G Dooijewaard, M van Vliet

  • 1Department of Medical Physiology and Sports Medicine, University of Utrecht, The Netherlands.

Thrombosis and Haemostasis
|February 1, 1994
PubMed
Summary

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Physical exercise increases urokinase-type plasminogen activator (u-PA Ag) and tissue-type plasminogen activator (t-PA Ag). These activators are regulated by independent mechanisms during exercise, with distinct responses during maximal exertion.

Area of Science:

  • Physiology
  • Biochemistry
  • Exercise Science

Background:

  • Plasma levels of urokinase-type plasminogen activator (u-PA Ag) and tissue-type plasminogen activator (t-PA Ag) increase during physical exercise.
  • The comparative changes and post-exercise clearance rates of these two activators are not well understood.

Purpose of the Study:

  • To investigate the changes in u-PA Ag, t-PA Ag, and t-PA activity during standardized submaximal and maximal exercise.
  • To determine if the regulation of u-PA and t-PA during exercise involves independent mechanisms.

Main Methods:

  • A standardized exercise test was employed, including both submaximal and maximal exercise intensities.
  • Measurements included plasma levels of u-PA Ag and t-PA Ag, as well as t-PA activity.

Related Experiment Videos

Main Results:

  • During submaximal exercise, u-PA Ag increases are primarily linked to plasma volume changes, while t-PA Ag shows a continuous rise.
  • Peak levels of u-PA Ag and t-PA Ag do not coincide in time or magnitude during maximal exercise.
  • u-PA Ag levels correlate more closely with t-PA activity (t-PA Act) than t-PA Ag levels during maximal exercise.

Conclusions:

  • Independent mechanisms regulate the exercise-induced plasma levels of u-PA and t-PA.
  • The distinct responses suggest differential regulation pathways for these fibrinolytic activators during varying exercise intensities.