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As far as I know, the intensive cardio workouts over a long period of time cause heart growth. The heart muscle is bigger and can pump more blood with one heart beat, allowing the same effort with lower HR (and much more intensive effort with the maximal HR).

Can I make estimation if my heart muscle has grown, comparing the same segments with the similar tempo over the long time period? If my HR is lower with the same effort, does it mean my heart is now bigger? Or there are much more factors to consider, like the optimized oxygen usage in the muscles?

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    Why do you need to measure the growth of your heart? – David Scarlett Jun 2 at 0:16
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    There are many factors at play (Such as the body growing extra blood vessels) as you get fitter and stronger, so there is no real way to estimate it. As @DavidScarlett says, why do you need to know this? – JohnP Jun 2 at 15:26

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