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Originally Posted by fengshway
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I know. But you must know the stroke volume to know the cardiac output. The cardiac output is the amount of blood that leaves each ventricle in each minute. The amount of beats X's the stroke volume. Or would the equations on the test give you the stroke volume and heart rate then tell you to calculate the Q?
When meeting with a new client, how are you suppose to read his Q then? Would you have to send him to a cardiologist to get his SV or is there a way to measure it in the gym?
Thanks for your reply.
Quote:
Originally Posted by LisaS
What do you mean "so I won't have to measure those two alone?"
What is the context that you think you need to be measuring these at all without a sound understanding of the physiology?
Or is this for some exam that you will be taking and you are trying to memorize the formulas and methods involved?
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I mean in real life. When getting a client, having to measure his or her cardiac output would require measuring the stroke volume as mentioned earlier. Q = SV X's HR. You'd have to know the stroke volume first.
I understand physiology, what I don't understand is the formula. During the ejection fraction of a resting heart beat the heart maintains 50% of the blood (from my understanding) and during systole (the contraction phase) only pumps out about 50% of the blood and the other 50% is kept in the heart during diastole that is pumped out a fraction of a second later. During aerobic exercise, the muscles demand more oxygen so the heart must pump more blood so the ejection fraction minimizes to less than 50% maintaining inside the heart during diastole.
In order to measure the stroke volume you'd have to know the amount of blood in ML's that leaves the heart with each contraction, differing between the resting heart rate and the working heart rate. But I still wasn't quite understanding how the amount of blood was measured, then I heard pulse pressure but I'm not sure I could accurately guess the amount of blood in ML's. I'm taking the ACE certification exam in a month and just wanted to make sure I have these formulas correct.