I’ve linked, further below, to a piece of content from WHOOP Review that gives their take on HRV. It’s quite a nice athlete-focussed overview that’s straightforward to read.
It covers these broad topics and more:
- What it is, what causes it, how it’s measured, and why it’s an indicator of fitness
- What’s a normal HRV for you and why trends matter (I found this bit interesting)
- Factors that affect it and how to improve it
- How to use HRV to train smarter and more efficiently
This links to WHOOP.com for the modestly named “the ultimate guide to HRV” aka “everything you need to know about HRV“
I’m currently re-investigating WHOOP v3 now that it allows HR to be broadcast but it’s proving to be taking a lot longer than I expected. Watch this space…
Must Read: Check out the latest WHOOP Review
Last Updated on 21 January 2026 by the5krunner
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors.
