Abstract
Conclusions
Exposure of male rats to hyperthermia (55°-57°C) for a 15 minute period caused an immediate thrombocytosis lasting for 1 hour after removal from heat stress, a delayed thrombocytosis starting 3 hours after removal from heat stress and lasting through day 2. and a thrombocytopenia appearing 7 days after heat stress. Speculation as to the different physiological mechanisms which might have caused the thrombocytosis at these 2 time periods points toward an immediate release of platelets from their followed by a hemoconcentration due to the pituitary-adrenal stress response. The delayed thrombocytopenia has been attributed to decreased production and/or release of new platelets.
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