SlowpulseWhat is a good HRV?
There is no single good number — and the research is unusually clear about why.
Read →HRV by age
Age-banded HRV tables circulate widely. The underlying research does not support them.
Read →The 4-7-8 breathing technique
Inhale for four, hold for seven, exhale for eight. What the pattern is, and how to run it properly.
Read →Resting heart rate, explained
What the number is, what counts as normal, and why the range is far wider than most people expect.
Read →HRV vs heart rate
One counts the beats. The other measures the gaps between them — and they can move in opposite directions.
Read →Why does HRV drop?
A 2024 review catalogued what actually moves the number. Most of it is ordinary.
Read →Does exercise affect HRV?
Regular training is associated with higher HRV. A hard session lowers it. Both are true, on different timescales.
Read →Not a medical device. Does not diagnose, treat or monitor any condition.