Stroke volume refers to the amount of blood ejected from the heart with each heartbeat. The only way to directly measure stroke volume is through a cardiac catheterization where the cardiac output can be directly measured with a catheter in the heart. You would be deathly ill if your stroke volume were 16, so I think that value refers to your VO2 max instead. I think you should check with your physician regarding this measurement. I hope you find this information useful.
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