What your wearable data actually means
HRV, resting heart rate, sleep stages, readiness, recovery and body battery: what each number measures, how accurate it is, and how to read the trend.
A ring or a watch produces a dozen numbers every morning. Some are measured directly and validated against lab equipment, some are estimates, and some are a company's own blend. These pages explain each one, what moves it, and how to tell a real change from noise.
Wearable data
18 pages.
- HRV explained
- What is a good HRV?
- Resting heart rate explained
- Sleep stages explained
- Deep sleep
- REM sleep
- Sleep score explained
- Oura Readiness Score
- WHOOP Recovery
- Garmin Body Battery
- WHOOP Strain
- Respiratory rate
- Skin temperature
- Blood oxygen (SpO2)
- VO2 max estimate
- Wearable accuracy
- Wearable data on a GLP-1
- Reading wearable trends
