Timer for recovery before the heart contracts again
When heart rate increases, there is less time for the heart to fill with blood before it contracts again. This results in a decrease in the amount of blood pumped out with each heartbeat, known as stroke volume.
Diastolic and systolic is when your heart contracts and relaxes.
The spaces between pulsations are called diastole. This is the phase of the cardiac cycle when the heart muscle relaxes and fills with blood before it contracts again during systole.
Your heart recovery time is the time it takes you to get from your max heart rate to your resting heart rate.
Blood flows to the heart when the ventricle contracts
If you go to http://www.cts.usc.edu/hpg-index.html they have lots of information about recovery after herat surgery. Also they have information about before surgery as well.
heart
they open to allow the blood through then close again so the blood can't flow back
The faster the recovery heart rate drops, the more fit you are.
If the heart stops (heart attack) the loss of new blood supply causes heart muscle to begin dieing and if recovery isn't started soon you will die. If the heart attack is caused from one or more blocked arteries then the heart tissue depending on blood flow will begin dieing. Quick recovery of blood flow to the heart is necessary as the heart gets it's oxygen and nutrients before the other parts of the body.
The heart contracts and relaxes during a cardiac cycle.