Abstract
1. 1. Electrocardiograms of Gallotia galloti have been processed by a computerized system, to investigate the quantitative relationship between cardiac physiological processes assessed by the ECG intervals and body temperature changes. 2. 2. Electrocardiographic event (RR, PR, RT, QRS and TP) durations decrease exponentially with body temperature. Thus, the influence of body temperature changes on the cardiac cycle (RR interval), atrioventricular conduction time (PR interval), ventricular depolarization (QRS complex) and cardiac rest time (TP period) have been studied in terms of regression coefficients. 3. 3. The cardiac events most affected by body temperature changes were the cardiac rest period and the atrioventricular conduction time and the least affected were the RT interval and ventricular depolarization. 4. 4. The decrease of relative cardiac rest time together with the increase of relative RT interval appear to be the main factors that contribute to the increase of heart rate as body temperature increases.
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