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Why measuring heart-rate variability is important
Since your HRV pattern is a reflection of how much stress your body is under, virtually all facets of your lifestyle can affect it. Remember that stress is more than mental -- things like illness, emotional hardship, lack of sleep and dehydration are all examples of things that place stress on your body... More here.
It does make sense to take more notice of your HRV metrics, but with ECGs, blood oxygen, steps, heart rate, temperature and so many other parts of the body you can track, you have to wonder if we can take things just a little too far.