Why is it healthy to strain your heart through exercise, but unhealthy to strain it through stress, caffeine, nicotine etc? What is the difference between these kinds of cardiac strain?
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Exercise or cardio increases the efficiency of your stroke volume. Your heart naturally adapts and in some cases grows. Usually the left ventricle. Your cardiac output at rest is the same. It’s how much blood is being pumped in a minute. (Cardiac output=heart rate x stroke volume). Now you see if cardiac output is the same and your stroke volume (blood ejected per pump) increases, your heart rate has to decrease at rest. So for the strain you put in for that 30-60+ minute of cardio, it pays off in the long run. The opposite happens when someone gets older.(not talking about exercise) You will notice their heart rate naturally increases because their stroke volume gets lower over time as the heart ages. There are a ton of other positive factors you can even go into.
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