Yes, it is.FrankDay said:That, my friend, in not a mechanism.
Despite ever-increasing filling pressure, reduced filling time starts to limit ESV even at submaximal heart rates, but SV doesn't initially decrease because EDV progressively falls. You can only squeeze so much blood out of the heart, however, so eventually SV, and hence Q, also decrease.FrankDay said:Besides, in general, HR doesn't change much at VO2 max hence filling time should not change to explain the drop in output.LOL. Filling time decreases as HR increases at all heart rates. What "pushes" the heart beyond its maximum pumping capacity?
Unless you are specifically trained in, e.g., cycling, you can't push the heart to its maximum pumping capacity because you don't vasodilate enough. That's why the highest VO2 measured in such cases is referred to as VO2peak, not VO2max.FrankDay said:Why does the "maximum pumping capacity" of the heart depend upon how it is measured (running, cycling, rowing, etc)?
<snort>FrankDay said:When you explain it to the real experts in cardiac physiology, the cardiac anesthesiologists,
http://www.ncbi.nlm.nih.gov/pubmed/12591751FrankDay said:I doubt the cardiologists will buy your explanation either because there is no data to support what you say.