Display of heart variability

You can view Heart Rate Variability (HRV) data in graphical form on your iPhone through the Health app, provided HRV measurements have been recorded and saved to Apple Health.

The most common way to record HRV data is by pairing an Apple Watch with your iPhone. The Apple Watch periodically measures HRV and automatically syncs the readings with the Health app.

Alternatively, you can use another compatible wearable device or a third-party app that supports HRV measurement and writes the recorded data to Apple Health.

To view your HRV data:

1. Open the Health app on your iPhone.

2. Tap Browse → Heart → Heart Rate Variability.

3. You can view your recorded HRV measurements as a graph over different time periods, such as day, week, month, six months or year.

Important: Simply owning an iPhone does not mean it can independently measure HRV. You need a compatible device or app to record HRV readings and save them to Apple Health.