EFFECTS OF BODY-TEMPERATURE ON CARDIOVASCULAR FUNCTIONAL PARAMETERS IN RATS

1. The effects of colonic temperature on cardiovascular functional par ameters were assessed in rats under urethane anesthesia. 2. Body cooli ng (or hypothermia) increased heart rate, duration of QRS complex, amp litudes of P wave, R wave and T wave, duration of systolic wave, and m ean arterial pressure, but decreased duration of diastolic wave and pu lse pressure. 3. Body heating (or hyperthermia) increased heart rate a nd mean arterial pressure, but decreased the P-R interval, duration of the QRS complex, amplitudes of P wave and T wave, duration of systoli c wave and a whole blood pressure cycle, and duration of diastolic wav e.