Abstract:Brief cardiac cycles are required to achieve high heart rates as seen in endothermic animals. A main determinant of the cardiac cycle is the repolarization phase of the cardiac action potential, which is visible in the ECG as a T-wave. In mammals with high heart rates – such as rodents – the repolarization phase is short and the ECG is characterized by a positive deflection following the QRS-complex, the J-wave. It is unclear whether birds with high heart rates show similar ECG characteristics. Here we study c… Show more
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