Cardiac output is the total volume of blood pumped out by the left ventricle every minute. It can be calculated using the following equation:
Stroke volume is the volume of blood pumped out of the left ventricle each time the heart beats
Heart rate is the number of beats per minute and is the same as your pulse rate.
If the heart rate increases, cardiac output increases. Also if stroke volume increases, cardiac output will increase.
Either rearrange the above equation (SV = CO/HR or HR = CO/SV)
Or use this formula triangle to help:
Cover up what you want to find with your finger and write down what is left. This will give the correct formula. If you want SV, cover SV with your finger and you are left with CO/HR.
For example, if the stroke volume at rest is 70 cm3 and the heart rate is 70 bpm, then the cardiac output is 70 × 70 cm3 per minute = 4900 cm3 per minute.
If the SV is 72 cm3 and the CO is 5400 cm3/min, what is the HR?
HR = CO/SV = 5400/72 = 75 bpm
During exercise, the heart rate increases and the force of contraction of the ventricles increases, therefore cardiac output and stroke volume increase.