Cardiac output can be discussed as the heart rate (HR) and stroke volume (SV) which is the amount of blood ejected with each beat of the heart
Cardiac Output = Heart Rate x Stroke Volume
Q = HR x SV
When resting an average person’s stroke volume is 70ml per beat and 70 beats per minute. This results in a cardiac output of approx 5,000ml per minute or 5 litres per minute. The cardiac output requirement is determined by the demand for oxygen at rest and the need to supply a high blood flow to the kidneys.
The cardiac output doesn’t change during rest as a result of aerobic training, however, the way in which the heart delivers the resting demand does. For example :
Depending on the intensity of exercise, cardiac output will increase rapidly and then gradually until a steady state is reached.
Cardiac output is the amount of blood pumped by the heart during a one minute period. Cardiac output shows us the functional capacity of the cardiovascular system to meet the demands of physical activity.