Eduardo, 30 years old, is undergoing an exercise test to see if he is fit to run the marathon. His blood pressure is 145/80 mmHg and his heart rate is 150 bpm. Considering the cardiac cycle, the phase that is affected first would be:


a- Diastasis phase.
b- Rapid filling phase.
c- Isovolumetric systole phase.
d- Atrial systole phase.
e- Rapid ejection phase.