Abstract

The effect of muscular exercise, heat stress, and muscular exercise plus heat stress on the euglobulin fibrinolytic enzyme system was determined in 11 Alsatian dogs prior to and after acclimatization in a hot environment. All the physiological stresses employed, particularly muscular exercise in a hot environment, enhanced the fibrinolytic activity and lowered plasma fibrinogen levels in all animals, especially in the nonacclimatized. The increased fibrinolytic activity, as measured by fibrin plate methods, was primarily related to plasminogen activator and to a lesser degree to active plasmin. In acclimatized animals at rest, the activity of plasminogen activator is lower, that of plasmin is relatively unchanged, while the level of plasma fibrinogen tends to be higher than in nonacclimatized animals at rest. euglobulin fibrinolytic activity and heat acclimatization in dogs; heat stress; plasminogen activator; plasmin fibrinogen and heat acclimatization; nonacclimatized and heat-acclimatized dogs Submitted on November 23, 1964

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