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HRV explained

How HRV fits into a readiness score.

daygauge reads HRV from Apple Health and uses it beside sleep and resting heart rate, so one noisy reading does not decide your day.

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The question

Start with what your own data can show.

People search HRV because wearables show it without enough explanation.

A useful HRV score explains direction, baseline and context instead of implying that one low reading means something is wrong.

Quick answer

daygauge compares your HRV with your own recent average. HRV is 35% of readiness, beside sleep and resting heart rate, and recovery (HRV and resting heart rate) is 25% of the Life Index.

Questions answered

What this guide covers.

  • What does HRV mean?
  • Why is my HRV low?
  • Can HRV show stress?
  • Should HRV affect a readiness score?
  • How does daygauge use HRV?
In daygauge

How the app handles this.

Signal
HRV is treated as a recovery signal, not a mental health, hormone or heart diagnosis. You can see it in the body signals on Today.
Confidence
Missing readings lower confidence instead of creating false certainty.When a reading is not available, daygauge says so rather than filling the gap.
Weekly Review
Weekly Review shows what changed, what moved with it and whether the pattern repeated.Your first Weekly Review is free. Later reviews are part of Pro.
Illustrative example

What this can look like in the app.

Example: HRV 9 ms below your recent average, resting heart rate 2 bpm higher and sleep 41 minutes below your average.

Example
Confidence

Confidence rises when the same pattern repeats against your own baseline and drops when key signals are missing.

Next move

Try one small change, log it, then see whether the pattern repeats over the next week.

Example 1

Example: HRV and resting heart rate point the same way, so readiness reads lower than usual.

Example 2

Example Quest: keep the next day lighter, hold a steady sleep window and compare your next readings.

Research

Further reading.

These studies describe groups of people. They help explain the topic, but they cannot tell you what will happen to you.

Research context only. daygauge does not diagnose, treat, prevent or predict disease risk. Personal medical concerns belong with a qualified clinician.

Limits

What daygauge does not do.

  • It does not diagnose, treat or prevent disease, or predict your risk of it.
  • It does not claim one habit caused a result. It shows the pattern, how confident it is and what else changed.
Read next

Related guides.

A recovery score needs sleep, HRV, resting heart rate and your own baselineWearables can show stress proxies. They cannot read your mindSleep midpoint can matter even when total sleep looks fine
On the App Store

Want daygauge to explain HRV against your own baseline?

daygauge is free to download. Pro is £8.99 a month or £49.99 a year.

Download on the App Store

Personal analytics, not medical advice