Doctor insights on:
Is Cardiac Output A Limiting Factor In Endurance Exercise
Can being a prior endurance athlete (but not currently trained) permanently affect cardiac output resulting in high numbers when all else is normal?
Athletic Heart: Interesting question! former athletes have been shown to have more left ventricular hypertrophy or thickened hearts that usually lessens with age and deconditioning. A thick heart can lead to poor heart filling by increased stiffness. A condition called diastolic dysfunction. This can lead to a type of congestive heart failure if it persists. Controlling hr and BP via meds can help. ...Read more
Exercise: In order to facilitate the increase in oxygen demand of the muscles during exercise, the heart rate and volume of blood per beat will go up. Cardiac output is the product of heart rate times stroke volume. Therefore cardiac output will increase with exercise. ...Read moreSee 1 more doctor answer
If cardiac output of 4 l/min is exercised maximally, and cardiac output increases to 8 l/min. What is the cardiac reserve?
25-30 L/min.: There are many variables. Cardiac output is stroke vol. X heart rate. At rest stroke vol. Is about 70 ml and rate is about 70 beats/min. During exercise cardiac output can be increased by about 5-6 times. The ability to increase cardiac output with exercise decreases with age due to decreased maximal blood volume capacity in the left ventricle (stroke vol.) and decreased maximal heart rate. ...Read moreSee 1 more doctor answer
Exercise increase CO: Exercise increases cardiac output as it usually increases both heart rate(hr) and stroke volume (sv) (amount of blood ejected by the heart in each beat) as cardiac output (co) = hr x sv. It is a compensatory mechanism to keep up with the demands of oxygen by the body doing exercise. If the cardiac output would not increase, the body would not be able to perform for long. ...Read more
All increase: Exercise causes an increased demand for blood flow to provide oxygen to the muscles doing the work. This is accomplished by increase in heart rate and stoke volume. Since cardiac output is determined by heart rate and stroke volume, it also goes up. Blood pressure also typically increases with strenuous exercise. ...Read more
Cardiac output: In strict physiologic terms, cardiac output is determined by something called stroke volume and heart rate. Heart rate is self-explanatory. Stroke volume is the amount of blood that the heart pumps out with each beat. This in turn is dependent on blood pressure, total blood volume, and how strong the heart contracts. ...Read moreSee 1 more doctor answer
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