The key passage is as follows:
Daily fluctuations are normal. Hard sessions or unusually long workouts often cause short-term drops in HRV, and that's not a problem provided values don't fall well below baseline. What matters is the seven-day trend and whether that trend begins drifting downward.
Chronic suppression tells us several things:
- the autonomic nervous system is not recovering
- training stress exceeds adaptive capacity
- intensity distribution is likely wrong, even if volume looks reasonable
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