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Articles

Blood Fibrinolytic Activity in Man

Diurnal Variation and the Response to Varying Intensities of Exercise

DOUGLAS R. ROSING, PIETER BRAKMAN, DAVID R. REDWOOD, ROBERT E. GOLDSTEIN, G. DAVID BEISER, TAGE ASTRUP, STEPHEN E. EPSTEIN
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https://doi.org/10.1161/01.RES.27.2.171
Circulation Research. 1970;27:171-184
Originally published August 1, 1970
DOUGLAS R. ROSING
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PIETER BRAKMAN
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DAVID R. REDWOOD
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ROBERT E. GOLDSTEIN
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G. DAVID BEISER
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TAGE ASTRUP
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STEPHEN E. EPSTEIN
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Abstract

This investigation was undertaken in normal subjects to define the relationship between the intensity of exercise and magnitude of fibrinolytic response and to examine the effect of diurnal variations on the exercise response. Fibrinolytic activity was measured on fibrin plates and expressed as mm2. Diurnal variations occurred with lowest activity at 8:00 AM (mean, 66 mm2), and peak activity between 5:00 and 8:00 PM (mean, 266 mm2, P<0.001). Five minutes of maximal treadmill exercise caused a marked increase in mean activity from 90 to 658 mm2 (P<0.001). Five minutes of 70% maximal exercise produced no significant increase, but 30 minutes increased activity to 626 mm2 (P<0.005). In contrast, 30 minutes of 40% maximal exercise produced a small elevation from 80 to 173 mm2 (P<0.005). Maximal and 40% maximal exercise evoked greater responses at 4:00 PM than 8:00 AM. Exercise produces increases in fibrinolytic activity which are related to the relative intensity of exercise, its duration, and the time of day it is performed. Short bursts of intense exercise cause marked increases, but more prolonged bouts of moderate exercise are required to produce similar increases. The increases with prolonged mild exercise are small and comparable to those observed during resting diurnal variations.

  • oxygen uptake
  • maximal exercise
  • plasminogen activators
  • fibrinolytic inhibitors
  • Accepted May 25, 1970.
  • © 1970 American Heart Association, Inc.
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Circulation Research
August 1, 1970, Volume 27, Issue 2
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    Blood Fibrinolytic Activity in Man
    DOUGLAS R. ROSING, PIETER BRAKMAN, DAVID R. REDWOOD, ROBERT E. GOLDSTEIN, G. DAVID BEISER, TAGE ASTRUP and STEPHEN E. EPSTEIN
    Circulation Research. 1970;27:171-184, originally published August 1, 1970
    https://doi.org/10.1161/01.RES.27.2.171

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    Blood Fibrinolytic Activity in Man
    DOUGLAS R. ROSING, PIETER BRAKMAN, DAVID R. REDWOOD, ROBERT E. GOLDSTEIN, G. DAVID BEISER, TAGE ASTRUP and STEPHEN E. EPSTEIN
    Circulation Research. 1970;27:171-184, originally published August 1, 1970
    https://doi.org/10.1161/01.RES.27.2.171
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