In the late 1860s, Adolf Fick, a professor of physiology in the Faculty of Medicine in Würzberg, Germany, developed one of the methods we use today for measuring how much blood your heart pumps in a minute. Your cardiac output as you read this sentence is probably about 7 L/min. At rest it is likely to be a bit under 6 L/min. If you are a trained marathon runner running a marathon, your cardiac output can be as high as 30 L/min.
Your cardiac output can be calculated with the following formula:
y = Q / D,
where Q is the number of milliliters of CO2 you exhale in a minute and D is the difference between the CO2 concentration (ml/L) in the blood pumped to the lungs and the CO2 concentration in the blood returning from the lungs. With Q=233 ml/min and D=97−56=41 ml/L,
y = (233 ml/min) / (41 ml/L) ≈ 5.68 L/min,
fairly close to the 6 L/min that most people have at basal (resting) conditions.
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