I just realized a serious blunder in my most recent post. With training, cardiac output does not decrease. That would be insane, as you would be pumping less blood to the muscles -- not much of a training adaptation. What I meant to say, and I'm sure those of you who understand exercise physiology understood, is that the body is able to increase cardiac output -- but do it more efficiently by decreasing heart rate and increasing overall stroke volume (the amount of blood the heart pumps with each "beat").
Just caught that error and needed to rectify it. I feel a lot better now. New post coming soon.
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