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I am a Septuagenarian and my clades data doesn't even show up on that graph, which begs the question: what was the (original) source of that data? As an aside, I think it somewhat obvious that HRV would reduce with age given that atrial fib probabilities rise with it.

The very latest research has shown that fitness degradation with age is largely a myth when you remove confounding factors like arthritis.

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