heart rate calculation

Want a higher EF if were hyped and caffeine? Or is that the career of columns stay the same. The cardiac output is an estimate of the rate vs heart stroke volume. But I know if a faster HR will make the contractility of the myocardium or the growing decline?

At some point, the heart can not empty completely, since late faster and faster. His hyperventilation as, if not get enough oxygen. Cardiac output is the multiplication of stroke volume, ejection fraction and heart rate. If you are not using supplementary oxygen through the physical work, increased heart rate is more likely accompanied by reduced EF.

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