Old 03-12-19, 09:43 AM
  #213  
fstrnu
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Layman's

Fitness is the relationship between effort and power. If you can produce more power for the same effort then you are more fit. If you can produce the same power for less effort then you are more fit. As you become more fit you need to increase power in order to continually challenge the body. If you don't then your body has no reason to adapt.

Same goes for endurance, except that duration becomes the focus. If the duration of your endurance workouts doesn't increase as endurance improves then your body has no reason to continue to adapt. Cardiac drift for the same duration decreases with improved endurance. This is not an obscure concept and is also consistent with related concepts like aerobic decoupling.

Fatigue can cause an abnormally low heart rate. Simple math explains how this results in lower average work interval heart rate and higher cardiac drift.

Everything in this post is both 100% reproducible as well as are also the most likely explanation for these phenomenon when they occur. As with any metric, these become even more reliable with consistent direction/patterns over time.

It's really not rocket science.
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